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Artykuły w czasopismach na temat „Semi-Crystalline structure”

Autor: Grafiati

Data publikacji: 19 października 2024

Data aktualizacji: 31 lipca 2025

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1

Hajová, Hana, Richard Pokorný, and Juraj Kosek. "Diffusion Transport in Reconstructed Semi-Crystalline Structure of Polyolefins." Macromolecular Symposia 302, no. 1 (2011): 121–28. http://dx.doi.org/10.1002/masy.201000073.

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Moskalewicz, Tomasz, Sławomir Zimowski, Aleksandra Fiołek, Alicja Łukaszczyk, Beata Dubiel, and Łukasz Cieniek. "The Effect of the Polymer Structure in Composite Alumina/Polyetheretherketone Coatings on Corrosion Resistance, Micro-mechanical and Tribological Properties of the Ti-6Al-4V Alloy." Journal of Materials Engineering and Performance 29, no. 3 (2019): 1426–38. http://dx.doi.org/10.1007/s11665-019-04354-y.

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Abstract This paper describes ways of improving the tribological properties of the Ti-6Al-4V titanium alloy at room and elevated temperatures by electrophoretic deposition of Al2O3/PEEK708 composite coatings and post-heat treatment. The microstructure of the coating components and the coatings was examined by scanning and transmission electron microscopy as well as x-ray diffractometry. The influence of cooling rate after heating of the coated alloy on the PEEK structure and coating surface topography was investigated. It was found that slow cooling with a furnace produced a semi-crystalline s

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3

Kalwik, Aleksandra, Przemyslaw Postawa, and Marcin Nabialek. "Analysis of Ageing Processes of Semi-Crystalline Materials." Materiale Plastice 57, no. 3 (2020): 41–51. http://dx.doi.org/10.37358/mp.20.3.5378.

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The article presents the influence of accelerated UV ageing on the structural properties of selected polymer materials. In this study, 3 types of materials from a group of thermoplastics known as PP30T, PE, POM were used. The test samples were prepared by injection moulding. In turn, an accelerated UV ageing process (600 h) was carried out in the UV Test chamber with fluorescent lamps characterized by a wavelength of 313 nm. Changes in the structure of the tested materials were observed by using an optical microscope. Measurements of gloss on the surface of primary samples that were exposed to

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4

Filsinger, D. H., and L. K. Frevel. "Computer Automation of Structure-Sensitive Search-Match Algorithm for Powder Diffraction Analysis." Powder Diffraction 1, no. 1 (1986): 22–25. http://dx.doi.org/10.1017/s0885715600011246.

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AbstractThe Semi-manual Structure-sensitive SEARCH-MATCH procedure [Frevel, (1982), Anal. Chem. 54, 691–697] has been automated for the Hewlett-Packard HP 3354 Computer. The software is coded in the interpretive HP LAB BASIC II language. A core file of 1026 selected powder diffraction standards has been compiled covering the common crystalline phases encountered in industry, the ubiquitous crystalline minerals, and prototypes of the more frequently found crystal structures. Solid solutions can be readily identified.

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5

Simões, Ricardo, Júlio C. Viana, Gustavo R. Dias, and António M. Cunha. "Mechanical Behavior of the Lamellar Structure in Semi-Crystalline Polymers." Materials Science Forum 730-732 (November 2012): 1006–11. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.1006.

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We have employed molecular dynamics simulations to study the behavior of virtual polymeric materials under an applied uniaxial tensile load. Through computer simulations, one can obtain experimentally inaccessible information about phenomena taking place at the molecular and microscopic levels. Not only can the global material response be monitored and characterized along time, but the response of macromolecular chains can be followed independently if desired. The computer-generated materials were created by emulating the step-wise polymerization, resulting in self-avoiding chains in 3D with c

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6

Kim, Man-Ho, Jeong-Mann Doh, Seong Chul Han, et al. "The pore wall structure of porous semi-crystalline anatase TiO2." Journal of Applied Crystallography 44, no. 6 (2011): 1238–45. http://dx.doi.org/10.1107/s0021889811037447.

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The structure of porous TiO2prepared by electrochemical anodization in a fluoride-containing ethylene glycol electrolyte solution was quantitatively studied using small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS). The cylindrical pores along the coaxial direction were somewhat irregular in shape, were widely distributed in diameter, and seemed to have a broadly pseudo-hexagonal arrangement. The scattering from the pore wall showed a negative deviation from Porod scattering, indicating that the interface between TiO2and the pore was not sharp. A density grad

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7

Prevorsek, D. C. "Structure of semi crystalline fibers from interpretation of anelastic effects." Journal of Polymer Science Part C: Polymer Symposia 32, no. 1 (2007): 343–75. http://dx.doi.org/10.1002/polc.5070320119.

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8

Lovelace, J. J., K. Narayan, J. K. Chik, et al. "Imaging modulated reflections from a semi-crystalline state of profilin:actin crystals." Journal of Applied Crystallography 37, no. 2 (2004): 327–30. http://dx.doi.org/10.1107/s0021889804001773.

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Modulated protein crystals remainterra incognitafor most crystallographers. While small-molecule crystallographers have successfully wrestled with and conquered this type of structure determination, to date no modulated macromolecular structures have been reported. Profilin:β-actin in a modulated semi-crystalline state presents a challenge of sufficient biological significance to motivate the development of methods for the accurate collection of data on the complex diffraction pattern and, ultimately, the solution of its structure. In the present work, fine φ-sliced data collection was used to

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9

Bellinger, Daniel, Jens Pflaum, Christoph Brüning, Volker Engel, and Bernd Engels. "The electronic character of PTCDA thin films in comparison to other perylene-based organic semi-conductors: ab initio-, TD-DFT and semi-empirical computations of the opto-electronic properties of large aggregates." Physical Chemistry Chemical Physics 19, no. 3 (2017): 2434–48. http://dx.doi.org/10.1039/c6cp07673d.

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10

Avramova, Nadka. "Amorphous and Semi-Crystalline Nylon-6: Processing and Properties." Engineering Plastics 1, no. 4 (1993): 147823919300100. http://dx.doi.org/10.1177/147823919300100403.

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The influence of processing conditions on the structure and properties of nylon-6 are investigated. Amorphous nylon-6 is obtained and its properties are compared with those of semi-crystalline nylon-6. The kinetics of crystallization of nylon-6 depends strongly on the previous thermal prehistory of the melt. The recently observed cumulative character in the structural memory of nylon-6 is successfully applied for obtaining this polymer in a pure amorphous state. It was demonstrated that a critical temperature exists above which the “memory” of this polymer can be erased, and this critical temp

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11

Avramova, Nadka. "Amorphous and Semi-Crystalline Nylon-6: Processing and Properties." Polymers and Polymer Composites 1, no. 4 (1993): 261–74. http://dx.doi.org/10.1177/096739119300100403.

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The influence of processing conditions on the structure and properties of nylon-6 are investigated. Amorphous nylon-6 is obtained and its properties are compared with those of semi-crystalline nylon-6. The kinetics of crystallization of nylon-6 depends strongly on the previous thermal prehistory of the melt. The recently observed cumulative character in the structural memory of nylon-6 is successfully applied for obtaining this polymer in a pure amorphous state. It was demonstrated that a critical temperature exists above which the “memory” of this polymer can be erased, and this critical temp

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12

Schuster, Miriam. "Determination of the linear viscoelastic material behaviour of interlayers with semi-crystalline structures shown by the example of a semi-crystalline ionomer." Glass Structures & Engineering 7, no. 2 (2022): 157–71. http://dx.doi.org/10.1007/s40940-022-00185-x.

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AbstractThe temperature dependent linear viscoelastic material behaviour of the most commonly used interlayer PVB is typically determined by means of Dynamic-Mechanical-Thermal-Analysis (DMTA). By horizontally shifting the isothermal modulus curves, a mastercurve is created at a certain reference temperature, which can then be mathematically approximated with a Prony series. A time–temperature superposition principle can be derived from the shift factors. In contrast to PVB, EVA and ionomer (or ionoplastic) interlayers have semi-crystalline structures that melt when the melting temperature is

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13

Li, Mengmeng, Pieter J. Leenaers, Martijn M. Wienk, and René A. J. Janssen. "The effect of alkyl side chain length on the formation of two semi-crystalline phases in low band gap conjugated polymers." Journal of Materials Chemistry C 8, no. 17 (2020): 5856–67. http://dx.doi.org/10.1039/d0tc00172d.

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14

Kuttich, Björn, Alexander Matt, Christian Appel, and Bernd Stühn. "X-ray scattering study on the crystalline and semi-crystalline structure of water/PEG mixtures in their eutectic phase diagram." Soft Matter 16, no. 45 (2020): 10260–67. http://dx.doi.org/10.1039/d0sm01601b.

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Water/PEG mixtures start to phase separate below the liquidus line. Above the eutectic temperature the solid phase is either pure water ice or semi-crystalline PEG. Below the eutectic line both crystals coexist, no mixed-crystalline phase is found.

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15

Zhang, Binjia, Ling Chen, Fengwei Xie, et al. "Understanding the structural disorganization of starch in water–ionic liquid solutions." Physical Chemistry Chemical Physics 17, no. 21 (2015): 13860–71. http://dx.doi.org/10.1039/c5cp01176k.

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16

Tencé-Girault, Sylvie, Sylvie Lebreton, Oana Bunau, Patrick Dang, and François Bargain. "Simultaneous SAXS-WAXS Experiments on Semi-Crystalline Polymers: Example of PA11 and Its Brill Transition." Crystals 9, no. 5 (2019): 271. http://dx.doi.org/10.3390/cryst9050271.

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This manuscript of the special issue “Microstructural Evolution and Mechanical Behavior of Semi-Crystalline Polymers” aims to show that Small Angle X-ray Scattering (SAXS) and Wide Angle X-ray Scattering (WAXS) experiments performed simultaneously constitute a unique tool to obtain valuable information on the hierarchical structure of semi-crystalline polymers. These structural quantitative data are needed to model macroscopic properties of polymeric materials, for example their mechanical properties. To illustrate our point, we focus our study on the structure and morphology of polyamide 11.

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17

Flanagan, Bernadine M., Michael J. Gidley, and Frederick J. Warren. "Rapid quantification of starch molecular order through multivariate modelling of13C CP/MAS NMR spectra." Chemical Communications 51, no. 80 (2015): 14856–58. http://dx.doi.org/10.1039/c5cc06144j.

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18

Grubb, D. T. "Structure and properties of crystalline polymer fibers." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 444–47. http://dx.doi.org/10.1017/s0424820100126962.

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Most polymer fibers studied by TEM have been semi-crystalline or more recently liquid crystalline, both because the majority of technically interesting fibers are ordered and because scientific interest lies in the polymer morphology. The obvious common feature of fibers is that they are "fibrous" that is to say, they have long and narrow features aligned along the fiber direction. The basic unit obtained by a very local deformation of a crystal is called a micro-fibri l . [1,2] Fibrils may or may not be clear in the TEM, either because the structure itself is not well defined or because of su

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19

Soper, A. K., K. Page, and A. Llobet. "Empirical potential structure refinement of semi-crystalline polymer systems: polytetrafluoroethylene and polychlorotrifluoroethylene." Journal of Physics: Condensed Matter 25, no. 45 (2013): 454219. http://dx.doi.org/10.1088/0953-8984/25/45/454219.

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20

Aoki, H., and M. Kodama. "The behavior of water molecules in semi-crystalline bilayer structure of phosphatidylethanolamine." Journal of thermal analysis 49, no. 2 (1997): 839–45. http://dx.doi.org/10.1007/bf01996768.

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21

Gaskell, P. H. "Relationships between the medium-range structure of glasses and crystals." Mineralogical Magazine 64, no. 3 (2000): 425–34. http://dx.doi.org/10.1180/002646100549481.

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AbstractThe known structure of a crystalline phase is almost always useful in investigating the unknown structure of the compositionally equivalent glass. For the local environment around elements like Si, B and P, the correspondence between site geometry and symmetry can be impressively close. Beyond near neighbours, any relationship becomes less obvious – at least in real-space data. Progress in understanding the medium-range structures of glasses has been painfully slow as a result. One essential clue is given by reciprocal-space features at low Q (scattering vector) in X-ray or neutron sca

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22

Ellison, Michael S., Paulo E. Lopes, and William T. Pennington. "In-Situ X-Ray Characterization of Fiber Structure during Melt Spinning." Journal of Engineered Fibers and Fabrics 3, no. 3 (2008): 155892500800300. http://dx.doi.org/10.1177/155892500800300302.

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The properties of a polymer are strongly influenced by its morphology. In the case of fibers from semi-crystalline polymers this consists of the degree of crystallinity, the spacing and alignment of the crystalline regions, and molecular orientation of the polymer chains in the amorphous regions. Information on crystallinity and orientation can be obtained from X-ray analysis. In-situ X-ray characterization of a polymer during the melt spinning process is a major source of information about the effects of material characteristics and processing conditions upon structure evolution along the spi

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23

Bertoft, Eric. "Understanding Starch Structure: Recent Progress." Agronomy 7, no. 3 (2017): 56. http://dx.doi.org/10.3390/agronomy7030056.

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Starch is a major food supply for humanity. It is produced in seeds, rhizomes, roots and tubers in the form of semi-crystalline granules with unique properties for each plant. Though the size and morphology of the granules is specific for each plant species, their internal structures have remarkably similar architecture, consisting of growth rings, blocklets, and crystalline and amorphous lamellae. The basic components of starch granules are two polyglucans, namely amylose and amylopectin. The molecular structure of amylose is comparatively simple as it consists of glucose residues connected t

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24

YE, Xiufang, Jingxuan LIN, Dongchu CHEN, Menglei CHANG, and Hongyang WEI. "Design and Synthesis of Crystalline Carboxyl-terminated Polyester Resin." Materials Science 27, no. 2 (2021): 217–23. http://dx.doi.org/10.5755/j02.ms.24058.

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In this work, a novel semi-crystalline polyester resin synthesis was explored, then influence of alcohol/acid ratio and monomer’s structure on crystallinity of poliester resin were studied in details. The crystalline polyester resin was synthesized via a two-step melt-condensation method. The structure and performance of the polyester resin was characterized by X-ray diffraction, infrared radiation, differential scanning calorimeter, thermogravimetric analysis and melt flow rate. The effect of molar ratio between alcohol monomer and carboxyl monomer on the structure and performance of polyeste

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25

Kim, Hongdeok, and Joonmyung Choi. "Influence of crystalline structure on creep resistance capability in semi-crystalline Polymers: A coarse-grained molecular dynamics study." International Journal of Fatigue 188 (November 2024): 108517. http://dx.doi.org/10.1016/j.ijfatigue.2024.108517.

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BOGDANOV, A. A., S. V. PANIN, P. S. LYUBUTIN, and M. G. OSTAPENKO. "Development of cyclic creep under block loading of semi-crystalline peek." Izvestiya vysshikh uchebnykh zavedenii. Fizika 67, no. 7 (2024): 68–76. https://doi.org/10.17223/00213411/67/7/8.

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The effect of creep development that occurs under cyclic loading of polyetheretherketone (PEEK) is studied, where the cyclic creep parameter is used to quantitatively characterize the structure rearrangement. The magnitude of cyclic creep was calculated from mechanical hysteresis loops. To obtain the dependence of the magnitude of cyclic creep on the amplitude of the external cyclic stress, block loading was carried out with a stepwise increase in the amplitude. It is shown that the mechanism of development of cyclic creep under block loading has a two-stage character. The first stage is respo

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27

Goldman, Maxwell, and Yining Huang. "Investigation into the crystallization of molecular sieve DNL-6." Canadian Journal of Chemistry 100, no. 2 (2022): 123–31. http://dx.doi.org/10.1139/cjc-2021-0100.

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Crystallization of DNL-6, a silicoaluminophosphate (SAPO) based molecular sieve with the RHO topology, was investigated under both the hydrothermal synthesis (HTS) and dry-gel conversion (DGC) conditions. Crystallization of DNL-6 under the HTS conditions is rather fast. But a combination of crystallization under the DGC conditions and reducing reaction temperature slow down the reactions, allowing for intermediates to be captured. Under the DGC conditions, DNL-6 crystallizes through a semi-crystalline layered phase. The nature of this intermediate is aluminophosphate (AlPO) rather than SAPO wi

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Fiołek, Zimowski, Kopia, and Moskalewicz. "The Influence of Electrophoretic Deposition Parameters and Heat Treatment on the Microstructure and Tribological Properties of Nanocomposite Si3N4/PEEK 708 Coatings on Titanium Alloy." Coatings 9, no. 9 (2019): 530. http://dx.doi.org/10.3390/coatings9090530.

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Nanocomposite Si3N4/PEEK 708 coatings were successfully fabricated on the Ti-6Al-4V alloy substrate by electrophoretic deposition (EPD) and post-EPD heat treatment. The addition of chitosan polyelectrolyte into ethanolic-based suspensions enabled the cathodic co-deposition of ceramic and polymeric particles. Zeta potential measurements allowed the elaboration of stable suspensions. The selection of the optimal EPD voltage and time enabled uniform coatings to be obtained. Heating above the PEEK melting point and cooling with a furnace or in water resulted in the formation of dense coatings with

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Sakai, Atsushi, Keiji Tanaka, Yoshihisa Fujii, Toshihiko Nagamura, and Tisato Kajiyama. "Structure and thermal molecular motion at surface of semi-crystalline isotactic polypropylene films." Polymer 46, no. 2 (2005): 429–37. http://dx.doi.org/10.1016/j.polymer.2004.11.021.

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Tsuchikawa, Satoru, and H. W. Siesler. "Near-Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood. Part I: Softwood." Applied Spectroscopy 57, no. 6 (2003): 667–74. http://dx.doi.org/10.1366/000370203322005364.

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The diffusion process of several molecules (D2O, n-butanol (OD) and t-butanol (OD)) in softwood (Sitka spruce) was investigated by means of a deuterium exchange method and Fourier transform near-infrared (FT-NIR) polarization spectroscopy. The location of OH groups in different states of order of cellulose in wood was clarified by analyzing the FT-NIR transmission spectra ranging from 7200 to 6000 cm−1. Four absorption bands were assigned to 2 × v(OH) absorptions of the amorphous regions, OH groups in semi-crystalline regions, and two types of intramolecular hydrogen-bonded OH groups in the cr

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31

Hoffmann, Falk, Rainhard Machatschek, and Andreas Lendlein. "Understanding the impact of crystal lamellae organization on small molecule diffusion using a Monte Carlo approach." MRS Advances 5, no. 52-53 (2020): 2737–49. http://dx.doi.org/10.1557/adv.2020.386.

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AbstractMany physicochemical processes depend on the diffusion of small molecules through solid materials. While crystallinity in polymers is advantageous with respect to structure performance, diffusion in such materials is difficult to predict. Here, we investigate the impact of crystal morphology and organization on the diffusion of small molecules using a lattice Monte Carlo approach. Interestingly, diffusion determined with this model does not depend on the internal morphology of the semi-crystalline regions. The obtained insight is highly valuable for developing predictive models for all

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Syed Nuzul Fadzli, S. A., S. Roslinda, and Firuz Zainuddin. "Sol Gel Synthesis and In Vitro Evaluation of Apatite Forming Ability of Silica-Based Composite Glass in SBF." Key Engineering Materials 660 (August 2015): 125–31. http://dx.doi.org/10.4028/www.scientific.net/kem.660.125.

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In this study, xerogel glass based on SiO-CaO-PO4 was synthesized by a low temperature acid catalysed sol-gel route. The in vitro evaluation of apatite forming ability for the glass was conducted in simulated body fluid (SBF) solution as the glasses were immersed for duration of 1, 7, 24 hours and 7 days. The XRD analysis showed that the glass formed semi-crystalline structure when sintered at 1000oC and consisted of Ca2O7P2 and Ca2O4Si phases. Image captured using FESEM showed the apatite-like structures were eventually formed on the glass top surface in small numbers after the glass immersed

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Shieh, P. C., and J. M. Howe. "Investigation of the atomic structure of crystal/amorphous interfaces in Pd80Si20 Alloy by HRTEM and image simulations." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 114–15. http://dx.doi.org/10.1017/s0424820100173704.

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Determining the atomic structures of solid/liquid interfaces is important for understanding mechanisms of solidification of crystalline materials. To date, research in this area has largely been theoretical in nature because of the difficulty of determining the atomic structure of a solid/liquid interface experimentally. This study has employed HRTEM and image simulations to investigate the atomic structure of crystalline/amorphous interfaces in directionally crystallized Pd80Si20 amorphous ribbons. The crystalline/amorphous interface is similar to a solid/liquid interface in many respects. Th

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Schlicht, Samuel, Sandra Greiner, and Dietmar Drummer. "Low Temperature Powder Bed Fusion of Polymers by Means of Fractal Quasi-Simultaneous Exposure Strategies." Polymers 14, no. 7 (2022): 1428. http://dx.doi.org/10.3390/polym14071428.

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Powder Bed Fusion of Polymers (PBF-LB/P) is a layer-wise additive manufacturing process that predominantly relies on the quasi-isothermal processing of semi-crystalline polymers, inherently limiting the spectrum of polymers suitable for quasi-isothermal PBF. Within the present paper, a novel approach for extending the isothermal processing window towards significantly lower temperatures by applying the quasi-simultaneous laser-based exposure of fractal scan paths is proposed. The proposed approach is based on the temporal and spatial discretization of the melting and subsequent crystallization

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Maleki-Bigdeli, Mohammad-Ali, Majid Baniassadi, Kui Wang, and Mostafa Baghani. "Developing a beam formulation for semi-crystalline two-way shape memory polymers." Journal of Intelligent Material Systems and Structures 31, no. 12 (2020): 1465–76. http://dx.doi.org/10.1177/1045389x20924837.

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In this research, the bending of a two-way shape memory polymer beam is examined implementing a one-dimensional phenomenological macroscopic constitutive model into Euler–Bernoulli and von-Karman beam theories. Since bending loading is a fundamental problem in engineering applications, a combination of bending problem and two-way shape memory effect capable of switching between two temporary shapes can be used in different applications, for example, thermally activated sensors and actuators. Shape memory polymers as a branch of soft materials can undergo large deformation. Hence, Euler–Bernoul

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Chen, Jun-Qi, Xuan Wang, Wei-Feng Sun, and Hong Zhao. "Improved Water-Tree Resistances of SEBS/PP Semi-Crystalline Composites under Crystallization Modifications." Molecules 25, no. 16 (2020): 3669. http://dx.doi.org/10.3390/molecules25163669.

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Water-tree resistances of styrene block copolymer/polypropylene (SEBS/PP) composites are investigated by characterizing crystallization structures in correlation with the dynamic mechanical properties to elucidate the micro-structure mechanism of improving insulation performances, in which the accelerated aging experiments of water trees are performed with water-knife electrodes. The water-tree morphology in spherulites, melt-crystallization characteristics and lamella structures of the composite materials are observed and analyzed by polarizing microscopy (PLM), differential scanning calorime

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Reznik, P. L., O. A. Chikova та B. V. Ovsyannikov. "A Study of Flat Hot-Deformed Semiproducts Аl-Мg-Mn-Sc-Zr Microstructure, Phase Composition, Crystalline Structure and Mechanical Properties". Materials Science Forum 843 (лютий 2016): 117–22. http://dx.doi.org/10.4028/www.scientific.net/msf.843.117.

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The article investigates the influence of additional thermal treatment of an ingot before deformation on the microstructure, phase composition, crystalline structure, and mechanical properties of flat hot deformed semi-finished products made from Al-Mg-Mn-Sc-Zr aluminum alloy and presents the results obtained. Additional thermal processing of ingots before deformation was carried out in order to increase the level of the mechanical properties of semiproducts. Mechanical properties testing was carried out for both large-sized specimens and for sub-micro volumes of α-aluminum crystalline particl

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Podgorbunskikh, Ekaterina, Timofei Kuskov, Vladimir Bukhtoyarov, Oleg Lomovsky, and Aleksey Bychkov. "Recrystallization of Cellulose, Chitin and Starch in Their Individual and Native Forms." Polymers 16, no. 7 (2024): 980. http://dx.doi.org/10.3390/polym16070980.

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Semi-crystalline natural polymers are involved in many technological processes. Biopolymers having identical chemical compositions can differ in reactivity in heterogeneous transformations depending on their crystal structure (polymorphic modification). This paper compares the crystal structure recrystallization processes occurring in natural polysaccharides (cellulose, chitin, and starch) in the individual form and as a component of native biomass. Aqueous treatment of pre-amorphized semi-crystalline biopolymers was shown to result in swelling, thus alleviating the kinetic restrictions impose

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Androsch, René, Katalee Jariyavidyanont, and Christoph Schick. "Enthalpy Relaxation of Polyamide 11 of Different Morphology Far Below the Glass Transition Temperature." Entropy 21, no. 10 (2019): 984. http://dx.doi.org/10.3390/e21100984.

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Polyamide 11 (PA 11) samples of different supermolecular structure, including the crystal-free glass and semi-crystalline PA 11 of largely different semi-crystalline morphology, were prepared by fast scanning chip calorimetry (FSC). These samples were then annealed at different temperatures well below the glass transition temperature Tg. The main purpose of the low-temperature annealing experiments was the calorimetric detection of mobility of chain segments at temperatures as low as −40 °C (≈Tg − 80 K) where still excellent impact resistance is predicted. It was found that annealing PA 11 at

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Wu, Ruiqing, Jingjuan Lai, Yi Pan, Zhaohui Zheng, and Xiaobin Ding. "High-strain slide-ring shape-memory polycaprolactone-based polyurethane." Soft Matter 14, no. 22 (2018): 4558–68. http://dx.doi.org/10.1039/c8sm00570b.

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To enable shape-memory polymer networks to achieve recoverable high deformability with a simultaneous high shape-fixity ratio and shape-recovery ratio, novel semi-crystalline slide-ring shape-memory polycaprolactone-based polyurethane (SR-SMPCLU) with movable net-points constructed by a topologically interlocked slide-ring structure was designed and fabricated.

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Liu, Xuelian, Nicolas Desilles, Bo Jiang, Corinne Chappey, and Laurent Lebrun. "High barrier semi-crystalline polyesters involving nature occurring pyridine structure towards sustainable food packaging." Polymer 247 (April 2022): 124790. http://dx.doi.org/10.1016/j.polymer.2022.124790.

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ASAI, Shigeo. "The Control of Higher-Order Structure of Semi-Crystalline Polymers by Using Carbon Dioxide." Kobunshi 54, no. 9 (2005): 690. http://dx.doi.org/10.1295/kobunshi.54.690.

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Rajkumar, Ganeshalingam, Hind A. AL-Khayat, Felicity Eakins, Carlo Knupp, and John M. Squire. "The CCP13FibreFixprogram suite: semi-automated analysis of diffraction patterns from non-crystalline materials." Journal of Applied Crystallography 40, no. 1 (2007): 178–84. http://dx.doi.org/10.1107/s0021889806048643.

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The extraction of useful information from recorded diffraction patterns from non-crystalline materials is non-trivial and is not a well defined operation. Unlike protein crystallography where one expects to see well behaved diffraction spots in predictable positions defined by standard space groups, the diffraction patterns from non-crystalline materials are very diverse. They can range from uniaxially oriented fibre patterns which are completely sampled as Bragg peaks, but rotationally averaged around the fibre axis, to fibre patterns that are completely unsampled, to either kind of pattern w

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Hernandez, Marianella, Tiberio A. Ezquerra, and Miguel A. López-Manchado. "Effects of Orientation on the Segmental Dynamics of Natural Rubber." Materials Science Forum 714 (March 2012): 57–61. http://dx.doi.org/10.4028/www.scientific.net/msf.714.57.

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The effects of orientation on the segmental dynamics of vulcanized natural rubber have been studied by dielectric relaxation spectroscopy. Morphological changes during the stretching process were also investigated by wide-angle X-ray scattering using a synchrotron radiation. Results reveal that segmental dynamics of NR is affected by uniaxial stretching since a slowing down of the segmental relaxation is achieved. Also, there is evidence of an amorphous/semi-crystalline transition around 300% strain; below this extension, molecular chains show orientation, but no crystallization takes place; w

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Zhang, Ying, Mao Peng Geng, Lei Cheng, and Yan Chun Wang. "Influence of Processing Parameters on Microstructure of Casting Rolling Semi-Solid AZ91D Magnesium Alloy." Solid State Phenomena 141-143 (July 2008): 535–38. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.535.

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Semi-solid AZ91D magnesium slurry was prepared by mechanical stirring method and the evolution of microstructure under different technological parameters such as casting temperature, standing time, stirring time and stirring speed et al were studied. The results show that the technological parameters have great influence on the microstructure of the semi-solid magnesium slurry. Neither too high nor too low stirring speed is a benefit to form the semi-solid state; stirring time is also not too long; higher casting temperature is unfavorable; with the increasing of standing time, the steady-stat

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Bucknall, David G., Gabriel Bernardo, Meisha L. Shofner, et al. "Phase Morphology and Molecular Structure Correlations in Model Fullerene-Polymer Nanocomposites." Materials Science Forum 714 (March 2012): 63–66. http://dx.doi.org/10.4028/www.scientific.net/msf.714.63.

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In this work we have performed a systematic study of blends of [6,-phenyl C61 butyric acid methyl ester (PCBM) with the following amorphous and semi-crystalline polymers: atactic polystyrene (PS), syndiotactic polystyrene (syn-PS), poly (2-vinyl-naphthalene) (P2VN), poly (9-vinyl-phenanthrene) (P9VPh), poly (vinylidene-fluoride) (PVdF) and poly (3-hexyl-thiophene) (P3HT). Experimental measurements using DSC, x-ray and neutron scattering coupled with molecular modeling (MD and DFT) have been utilized to determine the solubility and phase morphology of these model polymer-fullerene blends.

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Pallach, Roman, Jan-Benedikt Weiß, Katrin Vollmari, and Sebastian Henke. "Entropy driven disorder–order transition of a metal–organic framework with frustrated flexibility." APL Materials 11, no. 4 (2023): 041118. http://dx.doi.org/10.1063/5.0144718.

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Flexible metal–organic frameworks (MOFs), showing a reversible phase change behavior in response to guest adsorption or temperature, provide unique opportunities for molecular separation or energy storage applications. Herein, we investigate the complex guest- and temperature-responsive behavior of a functionalized MOF-5 derivative. The material is characterized by a geometrically rigid network structure that is decorated with dispersion energy donating hexyloxy substituents. Distinguished by the phenomenon of frustrated flexibility, the functionalized MOF-5 derivative switches between a highl

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Madhloom, Samara A. "Structural Properties of Nanoparticles TiO2/PVA Polymeric Films." Al-Mustansiriyah Journal of Science 28, no. 2 (2018): 188. http://dx.doi.org/10.23851/mjs.v28i2.517.

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In this research, X-ray diffraction of the powder (PVA polymer, titanium dioxide with two parti-cle sizes) and (TiO2 (15.7 nm)/PVA and TiO2 (45.7 nm)/PVA) films have been studied,the amount of polymer is (0.5) g and (0.01)g from each particle sizes of nanoparticles will be used. Casting method is used to prepare homogeneous films on glass petri dishes. All parameters ac-counted for the X-ray diffraction; full width half maximum (FWHM), Miller indices (hkl), size of crystalline (D), Specific Surface Area (S) and Dislocation Density (δ). The nature of the structural of materials and films will b

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Spoerer, Yvonne, René Androsch, Dieter Jehnichen, and Ines Kuehnert. "Process Induced Skin-Core Morphology in Injection Molded Polyamide 66." Polymers 12, no. 4 (2020): 894. http://dx.doi.org/10.3390/polym12040894.

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Polyamide 66 (PA 66) was injection-molded to obtain samples with a structure gradient between skin and core, as it was revealed by analysis of the semi-crystalline morphology using polarized-light optical microscopy (POM). Wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) were employed to characterize thin sections with a thickness in the order of magnitude of 50 µm, allowing detection of crystals of different perfection, as a function of the distance from the surface. It was found that the transparent and non-spherulitic skin layer contains rather imperfect α-crystals

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Arguelles, A., M. Leoni, J. A. Blanco, and C. Marcos. "Semi-ordered crystalline structure of the Santa Olalla vermiculite inferred from X-ray powder diffraction." American Mineralogist 95, no. 1 (2009): 126–34. http://dx.doi.org/10.2138/am.2010.3249.

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