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Dissertations / Theses on the topic 'Melting and crystallization temperature'

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Published: 28 May 2022

Last updated: 31 July 2025

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1

Sohn, Seungman. "Crystallization Behavior of Bisphenol-A Polycarbonate: Effects of Crystallization Time, Temperature, and Molar Mass." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26980.

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Crystallization and multiple melting behavior of bisphenol-A polycarbonate (PC) was investigated using differential scanning calorimetry (DSC) for the monitoring of thermal behavior and atomic force microscopy (AFM) for the morphology study. The exceedingly slow crystallization kinetics of PC and the feasibility of obtaining near monodisperse fractions provide distinct advantages for the elucidation of the effects of crystallization time, temperature, and molar mass on crystallization kinetics. The effects of molar mass on the glass transition temperature (Tg) and heat capacity change at Tg

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2

Xu, Jiannong. "Equilibrium Melting Temperature Determination of Semicrystalline Polymers through Nonlinear Hoffman-Weeks Extrapolation and Secondary Crystallization of Ethylene/Styrene Copolymers." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/40263.

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The applicability of the conventional Hoffman-Weeks (HW) linear extrapolation for the determination of the equilibrium melting temperatures of semicrystalline polymers is critically reviewed. It is shown that the linear extrapolation of observed melting temperatures cannot, in general, provide a reliable estimate of the equilibrium melting temperature. A more rigorous nonlinear HW analysis is proposed in this dissertation, which yields more accurate estimates of the equilibrium melting temperatures for semicrystalline polymers. The proposed nonlinear HW analysis is successfully applied to the

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3

Babkina, A. N., P. S. Shirshnev, B. A. Tsekhomsky, and N. V. Nikonorov. "Temperature Effect on Exciton Absorption of CuBr Nanocrystals in Potassium-aluminaborate Glass." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35429.

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The paper describes the research of temperature effect of potassium-alumina-borate (PAB) glass with CuBr nanocrystals, which was obtained in optical wavelength region for the first time. Temperature dependence of optical density at different wavelengths was examined. Melting and crystallization temperatures were evaluated for different nanocrystals sizes. Great changes of exciton absorption band influenced by temperatures below 100°C were recorded. Propositions for studied glass application as tunable filters in electro-optic circuit were suggested. When you are citing the document, use t

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4

Zhang, Shuo. "Physical properties and crystallization of theophylline co-crystals." Licentiate thesis, KTH, Transport Phenomena, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13255.

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<p>This work focuses on the physical properties and crystallization of theophyline co-crystals. Co-crystals of theophylline with oxalic acid, glutaric acid and maleic acid have been investigated.</p><p>The DSC curves of these co-crystals show that their first endothermic peaks are all lower than the melting temperature of theophylline. The decomposition temperature of theophylline – oxalic acid co-crystal is at about 230 °C, determined by DSC together with TGA. After decomposition, the remaining theophylline melts at about 279 °C, which is higher than the known melting temperature of theophyll

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5

Snyder, Chad R. "Effect of chain structure on the thermodynamics and kinetics of polymer crystallization." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-155543/.

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6

Vincent, Matthew Ryan. "Crystallization and Melting Studies of Poly(ε-caprolactone) and Poly(ethylene oxide) using Flash™ Differential Scanning Calorimetry and Preparation and Characterization of Poly(δ-valerolactone) Fractions". Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/101668.

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The isothermal crystallization and melting temperatures of poly(ε-caprolactone) were correlated using fast differential scanning calorimetry. The melting kinetics was found to be independent of isothermal crystallization temperature and time. The conventional Hoffman-Weeks method could not be used to determine the equilibrium melting temperature because the observed melting temperatures were greater than the crystallization temperatures by a constant, so the Gibbs-Thomson method was used instead, yielding an equilibrium melting temperature of 103.4 ± 2.3°C. A modification was proposed to the n

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7

Jarvis, Richard Allan. "Crystallization and melting in geological fluid mechanics." Thesis, University of Cambridge, 1991. https://www.repository.cam.ac.uk/handle/1810/275236.

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8

Pearce, Robert 1964. "Melting and crystallization in poly(b-hydroxyalkanoate) blends." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41808.

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Crystallization and melting are investigated in blends involving bacterial poly($ beta$-hydroxyalkanoates), PHA's. Two different blend systems are investigated. The first comprises bacterial, isotactic poly($ beta$-hydroxybutyrate), PHB, blended with synthetic, atactic PHB. The second is composed of bacterial poly($ beta$-hydroxyvalerate), PHV, blended with poly($ beta$-hydroxybutyrate-co-hydroxyvalerate), P(HB-co-HV), and bacterial PHB.<br>Crystallization kinetics are measured for isotactic/atactic PHB blends. The atactic component is shown to depress the spherulitic growth rate of the isotac

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9

Feng, Lijun 1966. "Melting and crystallization behavior of linear low-density polyethylene." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86069.

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The melting and crystallization behavior of linear low-density polyethylene (LLDPE) is of great scientific and industrial importance. It depends strongly on polymer molecular structural characteristics and processing conditions, and determines polymer application properties. In this work, we study three different types of LLDPE polymers: metallocene-based LLDPEs (m-LLDPEs), Ziegler-Natta-based LLDPEs (ZN-LLDPEs), and m-LLDPE blends.<br>A generalized equation is introduced to clarify conceptual definitions of polymer melting temperatures. It incorporates the effects of comonomer volume,

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10

Verma, Ravi Kant. "Melting and crystallization studies in a partially excluding copolymer." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40130.

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11

Krawczynski, Michael James. "Experimental studies of melting and crystallization processes in planetary interiors." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69467.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 191-202).<br>Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's mantle, the Greenland ice sheet, and the Earth's cr

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12

Uan-Zo-li, Julie Tammy. "Morphology, Crystallization and Melting Behavior of Propylene-Ethylene Statistical Copolymers." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29143.

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In this work the morphology, crystallization and melting behavior of novel Dow Chemical propylene-ethylene copolymers were investigated. The incorporation of ethylene units into a polypropylene chain resulted in the decrease in crystallization, melting and glass transition temperatures and overall crystallinity. Based on the shape of heat capacity curves and the dependence of the melting temperature offset on ethylene content, it was concluded that copolymers prepared using different catalyst systems exhibited different ethylene sequence length distributions. The behavior of Dow Chemical pro

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13

Ayamine, Alban. "Melting point-structure relationships of multicomponent crystals." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2320.

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Thesis (MTech (Chemistry))--Cape Peninsula University Of Technology, 2015.<br>Twelve multicomponent crystals of dicarboxylic acids (succinic, adipic and suberic acid) with derivatives of picoline (4-picoline, 2,4-lutidine, 3,4-lutidine and 3,5-lutidine) were analyzed with the aim of finding correlation between their melting points and crystalline structural features. The solvates of SUC•2,4LUT, SUC•3,4LUT, SUC•3,5LUT and ADP•4PIC are already known structures but were remade for completeness and to obtain their accurate melting temperatures. The acids were selected because of their systematical

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14

Arnold, Lisa. "Crystallization and melting behavior of (ε-caprolactone)-based homopolymer and triblock copolymer". Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/38253.

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The goal of this work is to examine the applicability of the Lauritzen-Hoflinan (LH) surface nucleation theory to the crystallization kinetics of poly(ε-caprolactone), PCL. This theory has successfully predicted a number of experimental observations such as the temperature dependence of spherulitic growth rates and the inverse relation between undercooling and the lamellar thickness. Claims have appeared in the literature that analysis of growth rate data using the LH theory does not yield physically meaningful parameters. This work will show that the lateral and fold interfacial free energy p

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15

Arnold, Lisa. "Crystallization and melting behavior of (e-caprolactone)-based homopolymer and triblock copolymer /." This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-164002/.

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16

Brandom, Donald Keith. "Crystallization and melting behavior of an aromatic semicrystalline polyimide, LaRC CPI-2." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10032007-171904/.

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17

Yang, Sha. "Crystallization, Melting Behavior, Physical Properties, and Physical Aging of Ethylene/1-Octene Copolymers." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/72985.

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The time dependence of the physical properties of ethylene/1-octene (EO)-copolymers after primary crystallization is investigated by calorimetry, density, and creep measurements. The temporal evolution of the multiple melting of EO-copolymers is monitored by differential scanning calorimetry. The low temperature endotherm displays an evolution similar to that observed for the enthalpy recovery in glasses after physical aging. Using this analogy, a calorimetry-aging rate is defined, which quantifies the change in the low endotherm temperature with time. Similarly a density-aging rate is define

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18

Hassani, Farideddin. "Mechanical behaviour of steel near the incipient melting temperature." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69719.

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A new method of incipient melting temperature (IMT) detection, continuous heating and fracture (CHF) method, has been developed in which a constant strain rate tensile or torsion deformation is applied to a specimen whose temperature is simultaneously increased. The IMT is determined in a single test and any phase transformations before the IMT will also be detected by the effects on the stress vs. strain behavior in the same experiment. This method also provides information about the effect of phase transformation and temperature on the mechanical behaviour of steel near the incipient melting

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19

Wei, Xiupeng. "Multiscale modeling and simulation of material phase change problems: ice melting and copper crystallization." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/904.

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The primary objective of this work is to propose a state-of-the-art physics based multiscale modeling framework for simulating material phase change problems. Both ice melting and copper crystallization problems are selected to demonstrate this multiscale modeling and simulation. The computational methods employed in this thesis include: classical molecular dynamics, finite element method, phase-field method, and multiscale (nano/micro coupling) methods. Classical molecular dynamics (MD) is a well-known method to study material behaviors at atomic level. Due to the limit of MD, it is not reali

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20

Kim, Yoonkap. "Low temperature melting point metals for hot MEMS electrical switching." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Fall2007/Y_Kim_121307.pdf.

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21

Carter, Luke Nelson. "Selective laser melting of nickel superalloys for high temperature applications." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4410/.

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Selective Laser Melting (SLM) as a method of netshape manufacture is of growing interest within the aerospace industry. There is currently a lack of understanding of the influence of process variables on the integrity and properties of the as fabricated material. The research presented investigates the SLM fabrication of three nickel superalloys: Primarily CM247LC and CMSX486/IN625 as secondary alloys. CM247LC is Ni-base superalloy hardenable by the precipitation of the coherent \(\gamma\)'phase. It presents a particular challenge due to weld-crack susceptibility. This research aims to establi

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22

Kennedy, Mary A. "Crystallization and melting behavior studies of un-nucleated and silica-nucleated isotactic polystyrene and isotactic poly(propylene oxide)." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75765.

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The effect of silica on the crystallization and melting behavior of a highly isotactic, well characterized isotactic polystyrene (i-PS) have been investigated. The origins of the various endotherms obtained upon heating have been defined by partial scanning experiments and by a study of the effect of heating rate using differential scanning calorimetry (DSC). The presence of 1 part silica in 100 parts polymer (1 pph) decreases the maximum degree of crystallinity considerably but has a minimal effect on the rate of crystallization. Analysis by the Avrami method shows that the silica does not af

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23

Mohammadi, Hadi. "On the Melting and Crystallization of Linear Polyethylene, Poly(ethylene oxide) and Metallocene Linear Low-Density Polyethylene." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/84921.

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The crystallization and melting behaviors of an ethylene/1-hexene copolymer and series of narrow molecular weight linear polyethylene and poly(ethylene oxide) fractions were studied using a combination of ultra-fast and conventional differential scanning calorimetry, optical microscopy, small angle X-ray scattering, and wide angle X-ray diffraction. In the case of linear polyethylene and poly(ethylene oxide), the zero-entropy production melting temperatures of initial lamellae of isothermally crystallized fractions were analyzed in the context of the non-linear Hoffman-Weeks method. Using the

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24

Trudel, Alain. "Effects of decarburization on the incipient melting temperature of AISI 4140 steel." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22836.

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The continuous heating to fracture test (CHF) developed at McGill was used to study the effect of decarburization on the incipient melting temperature. In the CHF test, a sample was deformed at a constant true strain rate, while its temperature is increased at a constant rate. This test allows the incipient melting temperature to be determined using a single test, instead of the several required by isothermal tensile testing. An isothermal decarburization step, to create a decarburized layer at the surface of the sample, was added prior to the CHF test.<br>Analysis of the true stress vs temper

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25

Joumaa, Hady K. "Development of a uniform-droplet spray apparatus for high melting temperature metals." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32352.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.<br>Leaf 230 blank.<br>Includes bibliographical references (leaves 157-158).<br>The building and operation of a high-temperature uniform droplet spraying (UDS) apparatus extend the performance and capabilities of powder based manufacturing processes. Although the main concepts of operation of the high-temperature apparatus are typical to the ones currently existing in the Droplet Based Manufacturing (DBM) laboratory, they are implemented with some different systems whose capabilities satisfy the process

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26

Taylor, Mark J. D. "Processing of porous high melting temperature metals using a removable second phase." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18216/.

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The production of high melting temperature porous metals using a removable second phase has been conducted using two different methods with two different categories of second phase. The first of these is the production of a porous high temperature metal using a nickel copper alloy which has undergone solidification-induced phase separation, followed by phase removal. In this system, the removable phase is an intrinsic part of the alloy (formed as part of the microstructure during solidification) which has been removed using a ferric chloride solution. The alloy has been processed using three d

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27

Kawachi, Shinji. "A study on the bubble removal process in high-temperature glass melting." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149852.

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28

Huang, Zhenyu. "Crystallization and Melting Behavior of Linear Polyethylene and Ethylene/Styrene Copolymers and Chain Length Dependence of Spherulitic Growth Rate for Poly(Ethylene Oxide) Fractions." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29211.

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The crystallization and melting behavior of linear polyethylene and of a series of random ethylene/styrene copolymers was investigated using a combination of classical and temperature modulated differential scanning calorimetry. In the case of linear polyethylene and low styrene content copolymers, the temporal evolutions of the melting temperature, degree of crystallinity, and excess heat capacity were studied during crystallization. The following correlations were established: 1) the evolution of the melting temperature with time parallels that of the degree of crystallinity, 2) the excess h

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29

Kumar, Amit. "Morphology, Crystallization and Melting Behavior of Statistical Copolymers of Propylene with Ethylene, 1-Butene, 1-Hexene and 1-Octene." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33563.

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In this thesis, the morphology, crystallization and melting behavior of polypropylene copolymers (propylene/ethylene, propylene/1-butene, propylene/1-hexene and propylene/1-octene) has been examined. The multiple melting behavior has been correlated with the presence of alpha and gamma phases and with the occurrence of cross-hatching morphology. The Crystallization and melting behavior of propylene/ethylene and propylne/1-butene are qualitatively similar and compatible with the expectations that the ethylene and butene comonomers are partly included in the propylene lattice. Propylene/1-hexen

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30

Subramaniam, Chitra P. "Morphology, Crystallization and Melting Behaviors of Random Copolymers of Ethylene with 1-Butene, 1-Pentene and 1-Hexene." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/28064.

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The morphology, crystallization and melting behaviors of a series of ethylene/alpha-olefin copolymers were investigated as a function of comonomer content, comonomer type and processing conditions, including crystallization temperature and time. This was achieved by using a combination of techniques such as Nuclear Magnetic Resonance Spectroscopy (NMR), Differential Scanning Calorimetry (DSC), Atomic Force Microscopy (AFM) and Fourier Transform Infrared Spectroscopy (FTIR). The results from the thermal analysis studies clearly indicated the existence of two distinct regions of crystallization

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31

Wang, Ningyu. "Melting, Solidification and Sintering/Coalescence of Nanoparticles." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284476300.

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32

Hakim, Mohammad Mojammel Al. "Low temperature seeded crystallization of amorphous silicon for transistor in grain technology." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/267567/.

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The continued scaling of MOSFETs to the deca-nanometre regime has reached the point where the transistor size is now comparable with the grain size in a polysilicon film (typically 100-200nm). The time is therefore right to research processing techniques that would allow a transistor to be fabricated inside a grain of polysilicon. Such transistors would be expected to have significantly better performance than thin film transistors (TFTs) because grain boundaries would be eliminated from the channel region. The transistor performance might also approach that achievable in single-crystal silico

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33

Everett, John. "Dissipation in high temperature superconducting tapes." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8576.

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34

Hoang, Jonathan Dan. "Evaluating the Time-Dependent Melting Behavior of Semicrystalline Polymers Through Strobl's 3-Phase Model." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19303.

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The melting behavior of polymers can provide information on their crystallization mechanism. However, the origin of the time-dependent low endotherm, or annealing peak, and the extent of melting-recrystallization-remelting during heating are still debated. The crystallization and subsequent melting behavior of isotactic polystyrene are explored in the context of Stroblâ "s 3-Phase model using differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and wide angle X-ray diffraction. DSC experiments confirm the existence of a crystallization time-dependent low endotherm, and

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35

Montierth, Charlene. "Geothermometry, crystallization, and the pahoehoe/àà transition in Mauna Loa lavas /." view abstract or download file of text, 1999. http://wwwlib.umi.com/cr/uoregon/fullcit?p9948026.

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Thesis (Ph. D.)--University of Oregon, 1999.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 129-135). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9948026.

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36

Cooper, Sharon Edie. "Study of the miscibility, morphology, crystallization, and melting behavior of blends of poly(3-hydroxybutyrate) and poly(vinylidene fluoride)." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11242009-020034/.

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37

Dorfler, Kristin Marie. "On Ultra-High Temperature Metamorphism in the Mid-Lower Crust." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/48927.

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The Cortlandt Complex in New York is a composite intrusion of six mafic plutons and contains pelitic xenoliths that experienced extensive interaction with Mg-rich basaltic melt. The complex is an excellent natural example of ultra-high temperature (UHT) metamorphic processes and country rock-magma interaction due to mappable units of hybrid igneous rocks and the presence of large, partially melted, politic "emery" xenoliths. Previous attempts to understand the formation of the UHT xenoliths in the Cortlandt have provided the petrologic foundation for more rigorous thermodynamic modeling to det

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38

Erdogan, Selahattin. "Synthesis Of Liquid Crystalline Copolyesters With Low Melting Temperature For In Situ Composite Applications." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613306/index.pdf.

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The objective of this study is to synthesize nematic-thermotropic liquid crystalline polymers (LCP) and determine their possible application areas. In this context, thirty different LCP&rsquo<br>s were synthesized and categorized with respect to their fiber formation capacity, melting temperature and mechanical properties. The basic chemical structure of synthesized LCP&rsquo<br>s were composed of p-acetoxybenzoic acid (p-ABA), m-acetoxybenzoic acid (m-ABA), hydroquinone diacetate (HQDA), terephthalic acid (TPA) and isophthalic acid (IPA) and alkyl-diacids monomers. In addition to mentioned mo

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39

Li, Qinghua. "Crystallization of colloidal TPA-silicalite-1 by a two-stage varying-temperature synthesis." Licentiate thesis, Luleå tekniska universitet, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17472.

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A novel synthesis method called a two-stage varying-temperature synthesis was developed for the investigation of kinetics and mechanism of the crystallization of discrete colloidal crystals of TPA-silicalite-1. Briefly, this method involves a rapid change in treatment temperature at some point during the crystallization. By extending the duration of the period at the initial synthesis temperature, the crystal concentration and final crystal size varied until they were approximately equal to those obtained for a complete synthesis at the initial temperature. At this point in the crystallization

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40

Yassin, Amal M. "Creep microstructure relationships in Sn-Sb and Sn-Sb-Cu alloys." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/1182.

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41

McGregor, Pamela A. "Crystal structure studies of low-melting point organic compounds at low temperature and high pressure." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/11125.

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42

Flower, Stephen Clive. "An ultrasonic study of vibrational anharmonicity in indium between room temperature and the melting point." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378139.

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43

TERNER, MATHIEU. "Innovative materials for high temperature structural applications: 3rd Generation γ-TiAl fabricated by Electron Beam Melting". Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2527509.

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In the aeronautics industry, the propulsion systems stand among the most advanced and critical components. Over the last 50 years, gas turbine aeroengines were subjected to intensive research to increase efficiency and reduce weight, noise and harmful emissions. Together with design optimization, breakthrough in materials science for structural applications triggered the development of the most advanced gas turbine engines. For low temperatures, basically ahead of the combustion section, lightweight Ti alloys are preferred for their good mechanical properties. For high temperatures instead, Ni

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44

Pak, Jeongihm. "Reversible melting and crystallization of short and long flexible chain molecules by temperature-modulated calorimetry." 2001. http://etd.utk.edu/2001/PakJeongihm.pdf.

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45

Su, Hsuan-Han, and 蘇宣翰. "Crystallization and Melting Behavior of Cyclic Polymer." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98227885707022729862.

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46

Huang, Yen-Ju, and 黃彥儒. "Crystallization and Melting Behavior of Poly(L-lacticacid)." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17227683417831347823.

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碩士<br>國立臺灣科技大學<br>高分子系<br>98<br>The crystallization kinetics and multiple melting behaviors of poly (L-lactic acid) (PLLA) were investigated by differential scanning calorimetry (DSC) and temperature-modulated differential scanning calorimetry (TMDSC). Avrami equation was used to find the nucleation and growth mode of PLLA in isothermal crystallization under the temperature range of 85℃ to 140℃. The nucleation and growth mode was changing in isothermal crystallization temperature above 130℃ due to as Avrami exponent (n) in 85℃-125℃ was n=2-3 and above 130℃ was n≦2. Nucleation rate and growth r

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47

Chuang, Wei-Tsung, and 莊偉綜. "Crystallization and Melting Behaviors of Poly(trimethylene terephalate)." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/6h7y4p.

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碩士<br>國立臺灣科技大學<br>纖維及高分子工程研究所<br>88<br>In the study, the crystallization and melting behaviors of polytrimethylene terephthalate (PTT) were investigated. Firstly, the crystallization kinetics was analyzed using the Avrami theory. Crystallization of PTT was carried out at isothermal crystallization temperatures from 438 to 488 K. The Avrami exponent n value varied from 2 to 3, indicating that the crystallization mechanism depends much on the crystallization temperature to exhibit various growth and nucleation processes. Then, the result in the secondary nucleation analyses shows a regime Ⅱ → re

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48

Hong, Qi-Jun. "Methods for Melting Temperature Calculation." Thesis, 2015. https://thesis.library.caltech.edu/8721/1/Thesis_Hong.pdf.

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<p>Melting temperature calculation has important applications in the theoretical study of phase diagrams and computational materials screenings. In this thesis, we present two new methods, i.e., the improved Widom's particle insertion method and the small-cell coexistence method, which we developed in order to capture melting temperatures both accurately and quickly.</p> <p>We propose a scheme that drastically improves the efficiency of Widom's particle insertion method by efficiently sampling cavities while calculating the integrals providing the chemical potentials of a physical system. T

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Chen, Chih-hua, and 陳志輝. "Crystallization and Melting Behavior of Poly(trimethylene 2,6- naphthalate)." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/27465514377548872494.

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碩士<br>國立臺灣科技大學<br>高分子系<br>94<br>In this paper, the temperature-induced Poly(trimethylene 2,6-naphthalate), PTN, polymorphism and the polymorphic transitions have been studied by simultaneous wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and differential scanning calormetry (DSC). It has been found that the isothermal crystallization leads to the formation of PTN polymorphic crystals, simply by changing the crystallization temperature. The PTN α-form crystal, β-form, and the mixture of two crystal forms grow at the crystallization temperatures below 120 °C, above 180

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Lin, Shi-Jieh, and 林詩傑. "Comonomer effects on crystallization and melting of syndiotactic polystyrene copolymers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/76727618326997240836.

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博士<br>國立清華大學<br>化學工程學系<br>100<br>Structural evolution of crystalline lamellae (cold- or melt-crystallized isothermally at Tc = 190 to 250 °C) of syndiotactic poly(styrene-stat-4- methylstyrene)s (sPS-4MS, with the mole fraction of 4MS units x ≈ 0.02 to 0.10) and sPS-aPS graft copolymers (based on sPS-10%4MS) upon heating in small steps (2 or 1 °C per 2-min interval) was examined via time-resolved small/wide-angle X-ray scattering (SAXS/WAXS). Compared to the homopolymer crystals prepared in the same Tc range, the incorporation of 4MS units resulted in preferred formation of α crystals (presuma

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