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Journal articles on the topic 'Glass transition temperature'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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1

Lebedev, M. P., O. V. Startsev, T. V. Koval, and I. M. Veligodsky. "Multiplet relaxation transitions in fluorurethane coating after climate aging." Doklady Rossijskoj akademii nauk. Himiâ, nauki o materialah. 516, no. 1 (November 3, 2024): 45–51. http://dx.doi.org/10.31857/s2686953524030068.

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The relaxation transition from a glassy to a highly elastic state (α-transition) of a fluoropolyurethane coating deposited on the surface of VPS-48/778 glass fiber reinforced plastic was studied using the method of dynamic mechanical analysis. It is shown that the relaxation maximum of the dynamic loss modulus in the initial state is a superposition of α1-, α2-, α3-transitions, corresponding, respectively, to transitions from the glassy to highly elastic state of VE-69 enamel and EP-0215 epoxy primer. The transition temperature α1, which is the glass transition temperature of fluoropolyurethan

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2

CONIGLIO, ANTONIO. "FRACTALS IN THE GLASS TRANSITION." Fractals 04, no. 03 (September 1996): 349–54. http://dx.doi.org/10.1142/s0218348x96000467.

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The static and fractal properties of the frustrated percolation model are investigated. This model, which contains frustration as an essential ingredient, displays glassy behavior at high density or low temperature and exhibits two transitions: a percolation transition at a temperature Tp with critical exponents of the ferromagnetic s=1/2 state Potts model, and a second transition at a lower temperature Tg in the same universality class of the Ising spin glass model.

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3

Ouyang, L. F., J. Shen, Y. Huang, Y. H. Sun, H. Y. Bai, and W. H. Wang. "Strong-to-fragile transition in a metallic-glass forming supercooled liquid associated with a liquid–liquid transition." Journal of Applied Physics 133, no. 8 (February 28, 2023): 085105. http://dx.doi.org/10.1063/5.0137847.

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Liquid–liquid transitions are present in a variety of substances. However, investigating the liquid–liquid transitions occurring in a supercooled liquid is difficult because of the interference from rapid crystallization. Here, we report a strong-to-fragile transition in a Pd32Ni52P16 metallic glass-forming supercooled liquid associated with a liquid–liquid transition. Since the liquid–liquid transition takes place at temperatures smaller than the crystallization temperature, the liquid viscosity can be acquired by creep experiments conducted at temperatures close to the glass transition tempe

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4

Reis, Ana Karoline dos, Francisco Maciel Monticelli, Roberta Motta Neves, Luis Felipe de Paula Santos, Edson Cocchieri Botelho, and Heitor Luiz Ornaghi Jr. "Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship." Journal of Composite Materials 54, no. 27 (May 22, 2020): 4121–31. http://dx.doi.org/10.1177/0021998320927774.

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In the present study, the creep behavior of polyetherimide semipreg and epoxy prepreg composites was studied using dynamic mechanical analyzer and focused on structure vs. property relationships in glassy, glass transition, and elastomeric regions. The main contribution to the field is to study pre-impregnated materials concerning creep behavior, mainly based on different analytical models, and microstructure. Two different reinforcements were used (carbon fiber and glass fiber) for each matrix. Findley, Burger, and Weibull analytical models were applied with an excellent fit for the most of t

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5

Heireche, M. M., L. Heireche, and M. Belhadji. "Thermal stability and glass transition kinetics in GeTeSb glasses by using non-isothermal measurement." Chalcogenide Letters 19, no. 10 (November 3, 2022): 735–41. http://dx.doi.org/10.15251/cl.2022.1910.735.

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In this paper we have analysed the thermal properties of three different compositions of chalcogenide glasses Ge15Te85-xSbx (x=0.5, 1, 1.5). The samples have been prepared using the melt quenching technique and the characterisation is done using X-ray diffraction. The compositional dependence on properties were studied using Differential Scanning Calorimetry (DSC) analysis using non-isothermal measurement. The glassy sample crystallized by two transition temperatures Tg1 and Tg2.The dependence of glass transition temperature on heating rate has been studied by Lasocka empirical relation and th

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6

ZHOU, BO, YAN-JU LIU, XIN LAN, JIN-SONG LENG, and SUNG-HO YOON. "A GLASS TRANSITION MODEL FOR SHAPE MEMORY POLYMER AND ITS COMPOSITE." International Journal of Modern Physics B 23, no. 06n07 (March 20, 2009): 1248–53. http://dx.doi.org/10.1142/s0217979209060762.

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As novel smart materials, shape memory polymer (SMP) and its composite (SMPC) have the ability to regain its original shape after undergoing significant deformation upon heating or other external stimuli such as light, chemic condition and so on. Their special behaviors much depends on the glass transitions due to the increasing of material temperature. Dynamic Mechanical Analysis (DMA) tests are performed on the styrene-based SMP and its carbon fiber fabric reinforced SMPC to investigate their glass transition behaviors. Three glass transition critical temperatures of SMP or SMPC are defined

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7

Su, Ming Horng, and Hung Chang Chen. "A Molecular Dynamics Investigation into the Cooling Characteristics of Ni and Cu Alloys at High Pressure." Materials Science Forum 505-507 (January 2006): 1093–98. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.1093.

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This paper studies the phase transitions of Cu and Ni alloys as they cool from melting temperature to room temperature under high-pressure conditions. The interatomic forces acting between the atoms are modeled by the tight-binding potential. Control over the environmental pressure and the cooling temperature is maintained by a canonical ensemble (N, P, T) system. The numerical results confirm that the metal phase transition is influenced significantly by the pressure conditions, even in the case of pure Cu and Ni metals. Three specific transition pathways are identified for the Cu and Ni allo

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8

Rokade, D.V, and R.H Nandkhile. "Review of Glass transition temperature:Basics & applications in biomedical." Journal of Research & Development 4, no. 14 (April 11, 2023): 35–42. https://doi.org/10.5281/zenodo.7817242.

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This review addresses the glass transition phenomenon from a kinetic and thermodynamic point of view by presenting the existing models for estimating the glass transition temperature. In this perspective, we summarize the most widely used traditional theories and new approaches to characterize the glass transition phenomenon, including the well-known free volume and configurational entropy models. The glass transition is a key phenomenon that contributes to understanding how external conditions affect physical changes in biomaterials. The glass transition temperature is an important phenomenon

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9

Verma, Arvind Kumar, Anchal Srivastava, R. K. Shukla, and K. C. Dubey. "Thermal Behavior of Chalcogenide glasses Te90Se10 and Se90Te10." SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 7, no. 02 (December 25, 2015): 113–18. http://dx.doi.org/10.18090/samriddhi.v7i2.8636.

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In the present research work melt quenching method has been adopted to prepare the glassy Te-rich (Te90Se10) and Se-rich (Se90Te10 ) Chalcogenide at a pressure of 10-2 Torr with constant Temperature at 1000°C for 8 hours. Devitrification characteristics of the pure glassy Chalcogenide Te90Se10 and Se90Te90 were investigated by using Differential scanning Calorimetry (DSC) 4000 Perkin Elmer. All the measurements carried out at fixed heating rate 10 0C/min under non-isothermal conditions. The Glass transition temperature (Tg) and other thermal properties were examined by temperature modulated di

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10

Luque, Patricia, and Antonio Heredia. "Glassy State in Plant Cuticles during Growth." Zeitschrift für Naturforschung C 49, no. 3-4 (April 1, 1994): 273–75. http://dx.doi.org/10.1515/znc-1994-3-419.

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The existence of a glassy state in isolated tomato fruit cuticles was investigated using differential scanning calorimetry. Tomato fruit cuticular membranes showed a glass transition temperature at -30 °C and an additional second order transition temperature near 30 °C. Changes in these temperatures during fruit growth were also studied

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11

KRASNOV, K. V., N. M. CHALAYA, and V. S. OSIPCHIK. "Research of technological properties of mixed compositions based on polyolefin thermoplastic elastomers." Plasticheskie massy 1, no. 1-2 (March 30, 2022): 14–15. http://dx.doi.org/10.35164/0554-2901-2022-1-2-14-15.

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Technological properties – phase transitions of mixed compositions based on polyolefin thermoplastic elastomers have been studied. The melting point and glass transition temperature of compositions were determined by DSC and DMA methods. The influence of the type of elastomer on the melting and glass transition temperatures of a mixed composite material is revealed.

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12

Jin, H. J., and K. Lu. "An indirect approach to measure glass transition temperature in metallic glasses." International Journal of Materials Research 97, no. 4 (April 1, 2006): 388–94. http://dx.doi.org/10.1515/ijmr-2006-0065.

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Abstract Glass transition behavior of metallic glasses under some extraordinary conditions (such as under high pressures) remains unexplored. Conventional measurements of glass transition temperature, T g, are very difficult to perform under these extraordinary circumstances. In the present paper, we introduce an indirect approach to characterize glass transition, using enthalpy recovery experiments. With annealing deeply relaxed glassy samples and subsequent DSC measurements, a variation of enthalpy change upon heating with annealing temperature can be obtained. The variation of enthalpy chan

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13

Сандитов, Д. С., В. В. Мантатов та С. Ш. Сангадиев. "Oбобщенный кинетический критерий перехода жидкость--стекло". Физика твердого тела 62, № 10 (2020): 1706. http://dx.doi.org/10.21883/ftt.2020.10.49925.082.

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Using the model of delocalized atoms, a substantiation and generalization of the Schmelzer glass transition criterion is proposed. In contrast to the Bartenev and Volkenstein - Ptitsyn approaches, in the generalized kinetic glass transition criterion, along with the relaxation time and the cooling rate of the melt, the glass transition temperature and an almost universal dimensionless constant appear, which is determined by the fraction of the fluctuation volume frozen at the glass transition temperature. The idea is developed that the liquid goes into a glassy state when its cooling rate q re

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14

Wei, Wen-Hou. "Effects of chemical composition and mean coordination number on glass transitions in Ge–Sb–Se glasses." Modern Physics Letters B 31, no. 36 (December 13, 2017): 1750342. http://dx.doi.org/10.1142/s0217984917503420.

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Glass transitions in the Ge–Sb–Se glasses were investigated by means of differential scanning calorimetry (DSC) under non-isothermal conditions. The glass transition temperature [Formula: see text], activation energy of glass transition [Formula: see text], and fragility index as functions of the mean coordination number (MCN) and atomic percent of Ge were examined. The maximum value of [Formula: see text] in each group of the glasses occurred at the chemically stoichiometric composition, suggesting a glass transition threshold. The [Formula: see text] and fragility index were calculated from

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15

Hanhi, K., and B. Stenberg. "Friction and the Dynamic Mechanical and Thermal Properties of Polyurethane Elastomers. 1. Solid Polyurethanes." Cellular Polymers 12, no. 6 (November 1993): 461–93. http://dx.doi.org/10.1177/026248939301200604.

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The results reported indicate that the properties of polyurethanes elastomers can be tailored to serve a wide variety of applications, for low temperature uses as well. The glass transition temperatures of the soft segments (Tgs) which control the low temperature properties of polyurethane elastomers, ranged from -79°C to -27°C (DSC onset values). The transitions observed in the range 75 to 125°C were attributed to hard segment glass transitions. The transitions at temperatures from 140 to 170°C, which were identified especially in the samples of over stoichiometric diisocyanate concentration,

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16

Hanhi, K., and B. Stenberg. "Friction and the Dynamic Mechanical and Thermal Properties of Polyurethane Elastomers. Solid Polyurethanes." Progress in Rubber and Plastics Technology 11, no. 1 (February 1995): 1–33. https://doi.org/10.1177/147776069501100101.

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The results reported indicate that the properties of polyurethanes elastomers can be tailored to serve a wide variety of applications, for low temperature uses as well. The glass transition temperatures of the soft segments (T gs ) which control the low temperature properties of polyurethane elastomers, ranged from -79°C to -27°C (DSC onset values). The transitions observed in the range 75 to 125°C were attributed to hard segment glass transitions. The transitions at temperatures from 140 to 170°C, which were identified especially in the samples of over stoichiometric diisocyanate concentratio

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17

Sheveleva, M. G., L. V. Taranova, and S. G. Agaev. "A dielectric investigation of structural-phase transitions in oils." Oil and Gas Studies, no. 6 (January 11, 2023): 110–25. http://dx.doi.org/10.31660/0445-0108-2022-6-110-125.

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The article deals with issues related to the mechanism of solidification of oils. The authors present the results of a dielectric investigation of structural-phase transitions in oils from the fields of Tyumen region in the temperature range -110 ÷ +20 °С. The dielectric relaxation of oils has been established, the values of the activation energy and dielectric relaxation time have been calculated. The phase transition determined by dielectric relaxation is interpreted as a transition from the glassy state to the associated state. The glass transition of oils, accompanied by the cessation of i

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18

Bartenev, G. M., and A. G. Barteneva. "Relaxation Transitions in Elastomers at Temperatures above the Glass Transition Temperature." International Polymer Science and Technology 33, no. 2 (February 2006): 9–14. http://dx.doi.org/10.1177/0307174x0603300203.

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19

Liang, Taining, Yong Yang, Dawei Guo, and Xiaozhen Yang. "Conformational transition behavior around glass transition temperature." Journal of Chemical Physics 112, no. 4 (January 22, 2000): 2016–20. http://dx.doi.org/10.1063/1.480761.

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20

CHAUDHARY, S., V. MODGIL, and V. S. RANGRA. "EFFECT OF COMPOSITIONAL VARIATION ON PHYSICAL PARAMETERS OF QUATERNARY CHALCOGENIDE GLASSES Se69Sn10Ge21-xSbx (6≤x≤14)." Journal of Ovonic Research 16, no. 1 (January 2020): 41–52. http://dx.doi.org/10.15251/jor.2020.161.41.

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The glassy alloysSe69Sn10Ge21-xSbx (where x= 6, 8, 10, 12, 14) are prepared by melt quench technique. The physical parameters have been studied such as average coordination number, number of constraints, floppy mode, Lone pair electron, mean bond energy and glass transition temperature etc.The chemical bond approach has been used to calculate cohesive energy of the samples. The mean bond energy and glass transition temperature has been calculated using Tichy-Ticha Approach. It has been observed from the study that with addition of Sb, the parameters such as average coordination number, mean bo

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21

Tefera, Getahun, Glen Bright, and Sarp Adali. "Influence of Long-Term Moisture Exposure and Temperature on the Mechanical Properties of Hybrid FRP Composite Specimens." Journal of Composites Science 8, no. 8 (August 9, 2024): 312. http://dx.doi.org/10.3390/jcs8080312.

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The present experimental study assesses the mechanical properties of glass/carbon/glass hybrid composite laminates after being exposed to moisture in a deep freezer and elevated temperatures for extended periods. The top and bottom layers of the hybrid laminates are reinforced with glass fibre, and the middle layer is reinforced with carbon fibre using the epoxy matrix as a binder polymer material. The hybrid laminates were manufactured using the resin transfer moulding method, and their compressive and tensile properties were determined using a tensile testing machine. The storage modulus, lo

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22

Geethamma, V. G., and M. P. Drupitha. "Glass Transition Temperature of Polymers." Resonance 29, no. 10 (November 11, 2024): 1401–20. http://dx.doi.org/10.1007/s12045-024-1401-x.

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23

Kajňaková, Marcela, Alexander Feher, Elena Fertman, Vladimir Desnenko, Anatoly Beznosov, and Sergiy Dolya. "Nanophase Separation and Magnetic Spin Glass in Nd_2/3Ca_1/3MnO₃." Solid State Phenomena 190 (June 2012): 675–78. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.675.

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A study of the low temperature magnetic state of polycrystalline colossal magnetoresistance perovskite Nd2/3Ca1/3MnO3 has been carried out. The data obtained, such as strongly divergent ZFC and FC static magnetizations and frequency dependent ac susceptibility, are evident of the glassy magnetic state of the system. Well defined maxima Tmax in the in-phase linear ac susceptibility χ curves were observed, indicating a spin-glass transition. Clear frequency dependence of the cusp temperature Tmax was found. The frequency dependence of Tmax was successfully analyzed by the dynamical scaling theor

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24

Wang, Wei Hua, Ping Wen, D. Q. Zhao, M. X. Pan, and Ru Ju Wang. "Relationship between glass transition temperature and Debye temperature in bulk metallic glasses." Journal of Materials Research 18, no. 12 (December 2003): 2747–51. http://dx.doi.org/10.1557/jmr.2003.0382.

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The Debye temperature and glass transition temperature of a variety of bulk metallic glasses (BMGs) were determined by acoustic measurement and differential scanning calorimetry, respectively. The relationship between the Debye temperature and glass transition temperature of these BMGs was analyzed, and their observed correlation was interpreted in terms of the characteristics of the glass transition in BMGs.

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25

Fairhurst, C. W., D. T. Hashinger, and S. W. Twiggs. "The Effect of Thermal History on Porcelain Expansion Behavior." Journal of Dental Research 68, no. 9 (September 1989): 1313–15. http://dx.doi.org/10.1177/00220345890680090401.

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Porcelain-fused-to-metal restorations are fired several hundred degrees above the glass-transition temperature and cooled rapidly through the glass-transition temperature range. Thermal expansion data from room temperature to above the glass-transition temperature range are important for the thermal expansion of the porcelain to be matched to the alloy. The effect of heating rate during measurement of thermal expansion was determined for NBS SRM 710 glass and four commercial opaque and body porcelain products. Thermal expansion data were obtained at heating rates of from 3 to 30°C/min after th

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26

Zamani, Nurhidayah R., Aidah Jumahat, and Rosnadiah Bahsan. "Dynamic Mechanical Analysis of Nanosilica Filled Epoxy Nanocomposites." Applied Mechanics and Materials 699 (November 2014): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.699.239.

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In this study, Dynamic Mechanical Analyzer (DMA) was used to study the effect of nanoparticles, which is nanosilica, on glass transition temperature (Tg) of epoxy polymer. A series of epoxy based nanosilica composite with 5-25 wt% nanosilica content was prepared using mechanical stirring method. The weight fractions of nanosilica in epoxy were 5 wt%, 13 wt% and 25 wt%. 30mm x 10mm x 3mm size specimens were tested using DMA machine from room temperature up to 180oC at 2°C/min heating rate. From the analysis of the results, dynamic modulus and glass transition temperature of pure polymer and nan

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27

Araki, W., T. Adachi, M. Gamou, and A. Yamaji. "Time-temperature dependence of fracture toughness for bisphenol a epoxy resin." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 216, no. 2 (April 1, 2002): 79–84. http://dx.doi.org/10.1177/146442070221600203.

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The relationship between the curing conditions and the time-temperature dependence of fracture toughness was investigated for bisphenol A epoxy resin. The glass transition temperature and Angell's fragility parameter, which are obtained from thermoviscoelasticity measurements, were used to characterize epoxy resins cured under various conditions. Examination of the fracture toughness at various temperatures and displacement rates showed that it depends on both temperature and time, and that it follows the time-temperature equivalence principle. The time-temperature dependence of the fracture t

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28

Elwardany, Michael D., Jean-Pascal Planche, and Jeramie J. Adams. "Determination of Binder Glass Transition and Crossover Temperatures using 4-mm Plates on a Dynamic Shear Rheometer." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 10 (May 16, 2019): 247–60. http://dx.doi.org/10.1177/0361198119849571.

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The accurate rheological characterization of asphalt binder properties, as a function of pavement service life, is crucial to improving asphalt binder specifications, modifications, and formulation methods. Bitumen streams from refineries have experienced significant changes since the development of SHRP Superpave specifications as a result of economic, technical, and environmental reasons. Binder rheological behavior is divided into three regions: near glassy region, terminal region, and an intermediate “transition” region between them. At a reference frequency, these regions are separated by

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29

TIWARI, SAURABH KUMAR, and SHELANDRA PATHAK PATHAK. "Parameters that depend on Glass Transition Temperature (Tg) in Indium doped Ge-Se Chalcogenide Glasses." ShodhPatra: International Journal of Science and Humanities 1, no. 8 (August 29, 2024): 17–25. https://doi.org/10.5281/zenodo.13497972.

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ABSTRACT: - Glass transition temperature (Tg) dependent properties described the structuralconfiguration of multicomponent chalcogenide glasses briefly. In the present work, Glass transitiontemperature dependent properties like the creation energy of micro-voids (Eh), the Urbach tailslope energy (Δ) and peak energy in the distribution of hoping barrier (Em) has been calculated forGe10Se90-xInx, Ge15Se85-xInx and Ge20Se80-xInx chalcogenide glassy systems. From the calculateddata we have seen that the values of Tg, Eh, Δ and Em vary with Indium content. Keywords: - Glass transition t

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30

Forrest, J. A., and K. Dalnoki-Veress. "When Does a Glass Transition Temperature Not Signify a Glass Transition?" ACS Macro Letters 3, no. 4 (March 17, 2014): 310–14. http://dx.doi.org/10.1021/mz4006217.

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31

Stunda, Agnese, Nina Mironova-Ulmane, Natalija Borodajenko, and Liga Berzina-Cimdina. "Phase Transition in Niobophosphate Glass-Ceramic." Advanced Materials Research 222 (April 2011): 259–62. http://dx.doi.org/10.4028/www.scientific.net/amr.222.259.

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Phase transition during crystallization of glass to glass-ceramic in system P2O5-CaO-Nb2O5-Na2O was studied. Several heating rates were compared – 1, 2, 5, 11 and 20°Cmin-1. DTA, XRD, FTIR and Raman analyses were performed. Niobophosphate glass-ceramic is found to form utterly different crystalline phases depending on maximal heating temperature, heating rate and time of maximal temperature maintenance. Crystallization temperatures of the same phases are strongly dependent on heating rate, while crystallinity of obtained phases is not. At lower temperatures poorly crystalline phosphates (Ca3(P

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32

Zhang, Yue, Shachi Katira, Andrew Lee, Andrew T. Lambe, Timothy B. Onasch, Wen Xu, William A. Brooks, et al. "Kinetically controlled glass transition measurement of organic aerosol thin films using broadband dielectric spectroscopy." Atmospheric Measurement Techniques 11, no. 6 (June 19, 2018): 3479–90. http://dx.doi.org/10.5194/amt-11-3479-2018.

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Abstract. Glass transitions from liquid to semi-solid and solid phase states have important implications for reactivity, growth, and cloud-forming (cloud condensation nuclei and ice nucleation) capabilities of secondary organic aerosols (SOAs). The small size and relatively low mass concentration of SOAs in the atmosphere make it difficult to measure atmospheric SOA glass transitions using conventional methods. To circumvent these difficulties, we have adapted a new technique for measuring glass-forming properties of atmospherically relevant organic aerosols. Aerosol particles to be studied ar

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Wang, Ben, Bowen Yang, Minghai Wang, Yaohui Zheng, Xianjun Hong, and Fan Zhang. "Effect of Cutting Temperature on Bending Properties of Carbon Fibre Reinforced Plastics." Science and Engineering of Composite Materials 26, no. 1 (January 28, 2019): 394–401. http://dx.doi.org/10.1515/secm-2019-0019.

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AbstractHigh cutting temperatures are easily generated during the machining of carbon fibre reinforced plastics (CFRP) and can induce serious damage during machining such as delamination. The purpose of this paper is to study the influence of cutting temperature on the performance of CFRP after machining. CFRP specimens were heated to temperatures within the vicinity of cutting temperatures generated during machining, then air-cooled and their bending properties investigated. The results showed that temperature had significant influence on the bending stress of CFRP. With increasing temperatur

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34

Atayeva, S. U., A. I. Isayev, S. I. Mekhtiyeva, S. N. Garibova, R. I. Alekberov, and F. N. Mammadov. "Glass transition and crystallization of Se95Te5 chalcogenide glassy semiconductor." Chalcogenide Letters 21, no. 4 (May 13, 2024): 355–63. http://dx.doi.org/10.15251/cl.2024.214.355.

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The study is dedicated to the investigation of thermo-physical characteristics of Se95Te5 chalcogenide glassy semiconductor during its glass formation and crystallization processes, employing various scanning rates of 5, 10, 15 and 20 K/min in non-isothermal modes through DSC measurement. Analysis of the structural relaxation kinetics involves the Kissinger’s, Augis and Bennett's, as well as Matusita’s approaches. Experimental data yield contains the determination of crucial parameters such as glass transition (𝑇𝑇𝑔𝑔), crystallization(𝑇𝑇𝑐𝑐), and melting temperatures alongside factors like reduc

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35

Mishra, Surabhi, Priyanka Jaiswal, Pooja Lohia, and D. K. Dwivedi. "Annealing Effect on the Optical Properties of Multi Walled Carbon Nano Tube Doped Cu5Se75Ge10In10 Thin Films Prepared by Thermal Evaporation Method." Advanced Science, Engineering and Medicine 12, no. 1 (January 1, 2020): 78–82. http://dx.doi.org/10.1166/asem.2020.2527.

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The optical properties of as prepared and annealed [(Cu5Se75Ge10In10)99 (CNT)1] thin films deposited with thermal evaporation technique has been discussed as a function of photon energy in wavelength range 300–900 nm in present paper. The bulk sample of as prepared glassy alloys were developed using the melt quench technique. Thin films of prepared glassy alloys were deposited on a glass substrate with thermal evaporation unit at room temperature at base pressure of ∼10–5 Pa. The films were annealed at two different temperatures between glass transition temperature and crystallization temperat

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36

Stoev, Krassimir, and Kenji Sakurai. "X-ray reflectivity study of the glass transition temperature of thin films." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C885. http://dx.doi.org/10.1107/s2053273314091141.

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The glass transition takes place in amorphous materials (like polymers) during heating or cooling, and can be described as reversible transition from a hard and brittle state into a rubber-like state. Although physical properties of the material change significantly during the glass transition, this is not a phase transition of the material. The temperature at which the transition between the glassy and rubbery state occurs is called the glass transition temperature, and this temperature is always lower than the melting temperature. Thermodynamically, the glass transition is associated with tr

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37

Iwagaki, Sakiko, Hiroki Kakuta, Yasuhisa Yamamura, Hideki Saitoh, Mafumi Hishida, Kazuhiro Fukada, and Kazuya Saito. "Ordering Phase Transition with Symmetry-Breaking from Disorder over Non-Equivalent Sites: Calorimetric and Crystallographic Study of Crystalline d-Sorbose." Crystals 10, no. 5 (May 1, 2020): 361. http://dx.doi.org/10.3390/cryst10050361.

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Phase transitions in the crystalline state of chiral sorbose were examined using precise heat capacity calorimetry and X-ray crystallography. The calorimetry established heat capacity below room temperature. Besides the known transition (main transition) at 199.5 K, the calorimetry detected plural thermal anomalies assignable to new phase transitions (around 210 K) and a glass transition (at ca. 120 K). The X-ray diffraction at low temperatures established the crystal structure of the lowest temperature phase. The identification of the broken symmetry upon the main transition solves an apparen

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da Silva, Antônio Carlos, S. C. Santos, and Sonia Regina Homem de Mello-Castanho. "Transition Metals in Glass Formation." Materials Science Forum 727-728 (August 2012): 1496–501. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1496.

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The structure of silicate glasses gets its charge stability through SiO2, R2O3, R2+and R+groups arrangement. In these glassy structures, transition metals are usually used as dopants in small amounts. However, in soda-lime glass systems, transition metals can take part in the glassy network in larger quantities as secundary former or modifier, insted R2+groups, if the charge balance conditions are made favorable by R2O3groups additions. This paper studies transition metals (Cr, Ni, Fe, Cu, Zn, Pb, Ru) soda-lime-borosilicate glass network incorporation. This process was applied for many kinds o

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Peng, Shirley, and Jude O. Iroh. "Dependence of the Dynamic Mechanical Properties and Structure of Polyurethane-Clay Nanocomposites on the Weight Fraction of Clay." Journal of Composites Science 6, no. 6 (June 14, 2022): 173. http://dx.doi.org/10.3390/jcs6060173.

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The effect of clay and chemical cross-linking on the dynamic mechanical properties of polyurethane reinforced with different concentrations of organically modified montmorillonite clay is investigated in this study. The polyurethane matrix is constituted of polytetrahydrofuran soft segment and 4,4′-methylenebis(phenyl isocyanate) hard segment. Glycerin was used as the chemical crosslinking agent, while Cloisite 30B clay was the reinforcing filler. The nanocomposites containing up to 1 wt.% clay showed a uniform dispersion of clay; however, the nanocomposites containing higher concentrations of

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Sharifi, Soheil. "Temperature Dependence of the Activation Volume of Secondary Relaxation in Glass Formers." ISRN Materials Science 2011 (July 25, 2011): 1–5. http://dx.doi.org/10.5402/2011/460751.

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We study a nonmonotonic behavior with temperature of the activation volume ΔVβ of secondary relaxation in PPGE [Poly[(phenyl glycidyl ether)-co-formaldehyde]] and PVAc [Poly(vinyl acetate)] glass formers. Our results show that the non-monotonic behaviour of secondary relaxation does not depend on the type of the secondary relaxation. Moreover, the study of secondary relaxation under pressure at isothermal paths shows two different behaviours of ΔVβ in the glassy state (which describe two different types of glasses); for temperatures higher than the glass transition temperature (Tg), ΔVβ increa

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El-Eskandarany, M. Sherif, Wei Zhang, and A. Inoue. "Mechanically induced solid-state reaction for synthesizing glassy Co75Ti25 soft magnet alloy powders with a wide supercooled liquid region." Journal of Materials Research 17, no. 9 (September 2002): 2447–56. http://dx.doi.org/10.1557/jmr.2002.0357.

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A single phase of glassy Co75Ti25 alloy powders was synthesized by high-energy ball milling the elemental powders at room temperature, using the mechanical alloying method. The final product of the glassy alloy, which is obtained after ball milling for 86 ks, exhibits soft magnetic properties with polarization and coercivity values of 0.67 T and 2.98 kA/m, respectively. This binary glassy alloy, in which its glass transition temperature (Tg) lies at a rather high temperature (833 K), transforms into face-centered-cubic Co3Ti (ordered phase) at 889 K through a single sharp exothermic reaction w

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Kim, Jong Sun, Kyung Hwan Yoon, and Julia A. Kornfield. "Measurement of Stress-Optical Coefficients of COC’s with Different Composition." Key Engineering Materials 326-328 (December 2006): 183–86. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.183.

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Rheo-optical and mechanical properties of Cyclic Olefin Copolymers(COC’s) with different composition have been investigated across the glass transition temperature. Accurate measurement of stress or strain-optical coefficients and elastic modulus data across the glass transition are essential for predicting optical anisotropy in many optical products like pickup lenses and waveguides in LCD backlight unit since the material of these products have both flow and thermal history from the melt to glass. To obtain stress-optic behavior in the wide frequency region including rubbery, glassy and glas

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Yoon, Heedong, and Gregory B. McKenna. "Testing the paradigm of an ideal glass transition: Dynamics of an ultrastable polymeric glass." Science Advances 4, no. 12 (December 2018): eaau5423. http://dx.doi.org/10.1126/sciadv.aau5423.

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A major challenge to understanding glass-forming materials is obtaining equilibrium data far below the laboratory glass transition temperatureTg. The challenge arises because it takes geologic aging times to achieve the equilibrium glassy state when temperatures are well belowTg. Here, we finesse this problem through measurements on an ultrastable amorphous Teflon with fictive temperatureTfnear to its Kauzmann temperatureTK. In the window betweenTfandTg, the material has a lower molecular mobility than the equilibrium state because of its low specific volume and enthalpy. Our measurements show

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Рыжов, В. А. "Универсальные особенности проявления взаимосвязи локальной и сегментальной динамики в стеклообразных полимерах на терагерцовых частотах в инфракрасных спектрах". Оптика и спектроскопия 131, № 1 (2023): 30. http://dx.doi.org/10.21883/os.2023.01.54534.4323-22.

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Low-frequency IR- spectra of glassy polymers were obtained and analyzed at temperatures from 90 to 400K. Temperature changes in the IR- spectra in the range from 10 to 140 cm-1 show three universal features: low-temperature, corresponding to the torsional-vibrational motion of monomer units, high-temperature, due to the influence of primary relaxation (glass transition) and intermediate, caused by the activation of conformational mobility in chains at a temperature of β - transition. This versatility extends both to polymers with universal chain-to-chain interactions and to those with hydrogen

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Monkos, Karol. "The Glass Transition Temperature and Temperature Dependence of Activation Energy of Viscous Flow of Ovalbumin." Current Topics in Biophysics 39, no. 1 (December 1, 2016): 13–25. http://dx.doi.org/10.1515/ctb-2016-0005.

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Abstract The paper presents the results of viscosity determinations on aqueous solutions of ovalbumin at a wide range of concentrations and at temperatures ranging from 5°C to 55°C. On the basis of these measurements and three models of viscosity for glass-forming liquids: Avramov’s model, free-volume model and power-law model, the activation energy of viscous flow for solutions and ovalbumin molecules, at different temperatures, was calculated. The obtained results show that activation energy monotonically decreases with increasing temperature both for solutions and ovalbumin molecules. The i

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Nabiałek, M. "Reduced Glass-Transition Temperature versus Glass-Forming Ability in FeCoB-Based Amorphous Alloys." Archives of Metallurgy and Materials 61, no. 4 (December 1, 2016): 1957–62. http://dx.doi.org/10.1515/amm-2016-0315.

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AbstractThis work presents studies concerning the relationship between reduction of glass transition temperatureTrgand the glass-forming ability of FeCoB-based alloys. On the basis of theoretical considerations, Turnbull [1] determined the reduced glass transition temperature (Tg/Tl) as being 2/3 of the Vogel–Fulcher–Tammann (VFT) temperature; since then, continuous research has been carried out, aiming to calculate the Trg parameter and describe its relationship with glass-forming ability. In the majority of research papers, the reduced glass transition temperature is calculated from the rela

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Kasparoglu, Sabin, Ying Li, Manabu Shiraiwa, and Markus D. Petters. "Toward closure between predicted and observed particle viscosity over a wide range of temperatures and relative humidity." Atmospheric Chemistry and Physics 21, no. 2 (January 27, 2021): 1127–41. http://dx.doi.org/10.5194/acp-21-1127-2021.

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Abstract. Atmospheric aerosols can exist in amorphous semi-solid or glassy phase states whose viscosity varies with atmospheric temperature and relative humidity. The temperature and humidity dependence of viscosity has been hypothesized to be predictable from the combination of a water–organic binary mixing rule of the glass transition temperature, a glass-transition-temperature-scaled viscosity fragility parameterization, and a water uptake parameterization. This work presents a closure study between predicted and observed viscosity for sucrose and citric acid. Viscosity and glass transition

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NEILSON, DAVID, ALEXANDER R. HAMILTON, and JAGDISH S. THAKUR. "QUANTUM GLASS TRANSITION AT FINITE TEMPERATURE IN TWO-DIMENSIONAL ELECTRON LAYERS." International Journal of Modern Physics B 27, no. 29 (November 5, 2013): 1347004. http://dx.doi.org/10.1142/s0217979213470048.

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We have investigated the formation of a quantum glass at finite temperatures in low-density two-dimensional conducting systems in semiconductor heterostructures. Using a memory function formalism we have determined the quantum glass melting curve for weak disorder as a function of density and temperature, and show that the glass-liquid transition is only weakly affected by increasing temperature at the least up to the Fermi temperature.

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Wang, Shunbo, and Yu S. Tver’yanovich. "Relationship of Temperature Dependences of Microhardness and Enthalpy of Glass on the Example of Selenium." Физика и химия стекла 49, no. 4 (July 1, 2023): 395–400. http://dx.doi.org/10.31857/s0132665123600012.

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A model is proposed that makes it possible to calculate the temperature dependence of the microhardness of glass over the entire temperature range from the softening temperature to absolute zero. The calculation uses the temperature dependence of the glass enthalpy and the value of its microhardness at the glass transition temperature. The proposed model is tested on the example of glassy selenium. For this, the temperature dependence of the microhardness of selenium on the softening temperature up to 100 K, which is 50 K below its Debye temperature, is measured. Thus, a relationship is establ

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Mosaddegh, Peiman, and John Ziegert. "The Effect of Temperature on the Stick-Slip Friction Behavior of Optical Glasses in Precision Glass Molding." Applied Mechanics and Materials 307 (February 2013): 381–86. http://dx.doi.org/10.4028/www.scientific.net/amm.307.381.

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Understanding the frictional behavior between glass and metals at elevated temperatures is necessary for accurate modeling and simulation of the precision glass molding (PGM) process, and can help in determining the required geometry of molds, inserts, and dies to produce various optical components. In this research, the frictional behavior of N-BK7, an oxide glass, at elevated temperatures in contact with plain steel has been studied. The results show two important phenomena related to temperature. First, the stick-slip phenomenon is more pronounced at higher temperatures close to the glass t

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