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Journal articles on the topic 'Crystallinity'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Zhang, Weiwei, Linjiang Chen, Sheng Dai, et al. "Reconstructed covalent organic frameworks." Nature 604, no. 7904 (2022): 72–79. http://dx.doi.org/10.1038/s41586-022-04443-4.

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AbstractCovalent organic frameworks (COFs) are distinguished from other organic polymers by their crystallinity1–3, but it remains challenging to obtain robust, highly crystalline COFs because the framework-forming reactions are poorly reversible4,5. More reversible chemistry can improve crystallinity6–9, but this typically yields COFs with poor physicochemical stability and limited application scope5. Here we report a general and scalable protocol to prepare robust, highly crystalline imine COFs, based on an unexpected framework reconstruction. In contrast to standard approaches in which mono

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2

Kübler, Bernard, and Michel Jaboyedoff. "Illite crystallinity." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 331, no. 2 (2000): 75–89. http://dx.doi.org/10.1016/s1251-8050(00)01395-1.

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3

Duta, Anca, and I. Kadas-Iluna. "Polyvinyl Alcohol Crystallinity." Materials Science Forum 133-136 (January 1993): 951–0. http://dx.doi.org/10.4028/www.scientific.net/msf.133-136.951.

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4

Jaboyedoff, M. "Illite “Crystallinity” Revisited." Clays and Clay Minerals 49, no. 2 (2001): 156–67. http://dx.doi.org/10.1346/ccmn.2001.0490205.

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5

Zhang, Xiao Xun, Luo Wang, and Qiu Hui Liao. "Experimental Study on the Crystallinity and Mechanical Properties of the Injection Molded Polypropylene." Advanced Materials Research 239-242 (May 2011): 2809–12. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2809.

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Polypropylene specimens were made by the injection molding experiments under different processing conditions. The crystallinity of each polypropylene specimen was obtained using the X-ray diffraction method. The effects of the injection molding processes on the crystallinity of polypropylene were revealed: (1) the crystallinity decreases as the melt temperature increases, and the higher the melt temperature, the slower the crystallinity decreases, (2) the crystallinity decreases as the mould temperature increases, and the higher the mould temperature, the faster the crystallinity decreases, (3

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6

Kosa, Tamas, Ludmila Sukhomlinova, Linli Su, Bahman Taheri, Timothy J. White, and Timothy J. Bunning. "Light-induced liquid crystallinity." Nature 485, no. 7398 (2012): 347–49. http://dx.doi.org/10.1038/nature11122.

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7

van Soest, Jeroen J. G., S. H. D. Hulleman, D. de Wit, and J. F. G. Vliegenthart. "Crystallinity in starch bioplastics." Industrial Crops and Products 5, no. 1 (1996): 11–22. http://dx.doi.org/10.1016/0926-6690(95)00048-8.

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8

Duta, Anca, R. Tica, Dana Perniu, and B. Cismas. "Poly (Vinyl Butyral) Crystallinity." Materials Science Forum 228-231 (July 1996): 889–94. http://dx.doi.org/10.4028/www.scientific.net/msf.228-231.889.

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9

Yu, Sze-Man, and Stefan Mecking. "Variable Crystallinity Polyethylene Nanoparticles." Macromolecules 42, no. 11 (2009): 3669–73. http://dx.doi.org/10.1021/ma9003665.

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10

Löwen, Hartmut, and Thomas Beier. "Crystallinity in liquid films." Physical Review B 41, no. 7 (1990): 4435–40. http://dx.doi.org/10.1103/physrevb.41.4435.

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11

Ludvigsson, M., J. Lindgren, and J. Tegenfeldt. "Crystallinity in Cast Nafion." Journal of The Electrochemical Society 147, no. 4 (2000): 1303. http://dx.doi.org/10.1149/1.1393354.

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12

Ballard, D. G. H., A. N. Burgess, J. M. Dekoninck, and E. A. Roberts. "The ‘crystallinity’ of PVC." Polymer 28, no. 1 (1987): 3–9. http://dx.doi.org/10.1016/0032-3861(87)90312-0.

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13

Matta, V. K., R. B. Mathur, O. P. Bahl, and K. C. Nagpal. "Crystallinity of PAN precursors." Carbon 28, no. 1 (1990): 241–43. http://dx.doi.org/10.1016/0008-6223(90)90123-g.

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14

Dole, Malcolm. "Crystallinity from thermal measurements." Journal of Polymer Science Part C: Polymer Symposia 18, no. 1 (2007): 57–68. http://dx.doi.org/10.1002/polc.5070180106.

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15

Alwaan, I. M. "Effect of Cyclo-Olefin Copolymer Loading on Kinetics, Thermodynamics and Model of Linear Low Density Polyethylene Crystallinity." Progress in Rubber, Plastics and Recycling Technology 34, no. 1 (2018): 55–74. http://dx.doi.org/10.1177/147776061803400104.

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The behavior of kinetic and thermodynamic characteristics of linear low-density polyethylene (LLDPE) crystallinity containing cyclo-olefin copolymer (COC) were investigated by means of differential scanning calorimeter (DSC). The crystallinity kinetic parameters including the crystallinity apparent activation energy (E), rate of crystallinity constant (K) and the order of crystallinity (n) were calculated with Borchardt and Daniels methods. The results have shown that the activation energy of blends increased with increase in the COC loading and the order of crystallinity was the first order f

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16

Fauziyah, N. A., D. S. Perwitasari, T. A. Fadly, S. Soontaranon, and S. Pratapa. "A Comparative Study of The Crystallinity Value of Polyethylene Glycol-Based Composites Using XRD and WAXS." Journal of Physics: Conference Series 2392, no. 1 (2022): 012033. http://dx.doi.org/10.1088/1742-6596/2392/1/012033.

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Abstract Crystallinity is an important parameter of thermoplastic polymers. Furthermore, crystallinity is closely related to processing conditions such as temperature and applied shear stress. However, determining the degree of crystallinity is very complicated because of the different interpretations of crystallinity according to each technique. In this paper, we analyze the crystallinity of polyethylene glycol-based composites using two instruments, i.e., X-Ray Diffraction (XRD) and wide-angle X-Ray Scattering (WAXS). The results showed that with the addition of 60 wt.% silica, the degree of

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17

Gibril, Magdi E., Hai Feng Li, Xin Da Li, et al. "Application of Twin Screw Extruder in Cellulose Dissolution with Ionic Liquid." Applied Mechanics and Materials 268-270 (December 2012): 605–9. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.605.

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Twin-screw extruder was used as a dissolution unit for microcrystalline cellulose with ionic liquid. Ionic liquid (1-butyl-3-methylimidazolium chloride) was applied as solvent and plasticizer; it was mixed with cellulose to prepare the extrusion mixture. The extrusion mixture was feed into twin screw extruder which was run under conditions; speed 65 rpm and 1400C. In order to determine whether the cellulose I has been transformed into cellulose II, the solubility, structure, crystallinty and thermal stability of the extrude cellulose were investigated by polarizing Optical microscope, FTIR, XR

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18

Okuno, T., T. Yasuda, and H. Yasuda. "Effect of Crystallinity of PET and Nylon 66 Fibers on Plasma Etching and Dyeability Characteristics." Textile Research Journal 62, no. 8 (1992): 474–80. http://dx.doi.org/10.1177/004051759206200807.

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We investigated the correlation between crystallinity and plasma susceptibility for PET and nylon 66 fibers. Plasma susceptibility is measured by the weight loss observed when fibers of varying crystallinity are exposed to air plasma. We varied the crystallinity of samples by annealing fibers at different temperatures. Plasma susceptibility and dyeability as a function of the crystallinity of fibers showed a striking resemblance: both decreased with increasing crystallinity up to a threshold crystallinity, above which there were appreciable increases. Plasma susceptibilities of these fibers, u

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19

CYR, NATSUKO, R. M. ELOFSON, and G. W. MATHISON. "DETERMINATION OF CRYSTALLINITY OF CARBOHYDRATES BY 13C CROSS POLARIZATION/MAGIC ANGLE SPINNING NMR WITH APPLICATIONS TO THE NUTRITIVE VALUE OF FORAGES." Canadian Journal of Animal Science 70, no. 2 (1990): 695–701. http://dx.doi.org/10.4141/cjas90-082.

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An NMR technique using solid samples is presented. The relative "crystallinity" of carbohydrates is estimated by the use of a 20 ms delayed contact pulse sequence. There was good agreement between the crystallinity of cellulose determined by the NMR procedure and that estimated by using an acid hydrolysis procedure. The "crystallinity index" (crystallinity relative to that of cellulose powder at 100) of timothy stems increased from seven for samples cut on 30 June to 16 for those cut on 15 July. Mature-weathered timothy stems which were collected in the spring had a "crystallinity index" of 20

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20

Gout, Robert, and Giles Verdes. "Effect of crystallinity on diaspore and boehmite relative stability." European Journal of Mineralogy 5, no. 2 (1993): 215–18. http://dx.doi.org/10.1127/ejm/5/2/0215.

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21

Ni, Tie Quan, and Chang Jun Ke. "Study on Crystallinity Degree of Hydration Products in Autoclaved Samples with Solid Wastes." Advanced Materials Research 168-170 (December 2010): 1169–73. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1169.

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The ratio of the dissolved amount difference between in cool hydrochloride and hot hydrochloride to the bound water amount of the samples is regarded as crystallinity degree; approximate expressed the proportion relation of crystal and gel in the samples. And studied the relationship of compressive strength and dissolved amount difference, bound water amount and crystallinity degree of autoclaved silicate products using solid waste. The results shown, dissolved amount difference, bound water amount and crystallinity degree of autoclaved samples are related to kinds of hydration products. When

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22

Li, Yao Xiang, and Li Chun Jiang. "Modeling Wood Crystallinity with Multiple Linear Regression." Key Engineering Materials 480-481 (June 2011): 550–55. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.550.

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The crystallinity of wood has an important effect on the physical, mechanical and chemical properties of cellulose fibers. Crystallinity of larch plantation wood was investigated with near infrared spectroscopy and multiple linear regression. Five typical wave lengths were selected to establish prediction model for wood crystallinity. Full-cross validation was applied to the model development. The model performance is satisfied with prediction correlation coefficient of 0.896 and bias of 0.0004. The results indicated that prediction of wood crystallinity with near infrared spectroscopy and mul

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23

Li, Jianguo, Peimin Zhao, Liyan Zhao, et al. "Integrated VIS/NIR Spectrum and Genome-Wide Association Study for Genetic Dissection of Cellulose Crystallinity in Wheat Stems." International Journal of Molecular Sciences 25, no. 5 (2024): 3028. http://dx.doi.org/10.3390/ijms25053028.

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Cellulose crystallinity is a crucial factor influencing stem strength and, consequently, wheat lodging. However, the genetic dissection of cellulose crystallinity is less reported due to the difficulty of its measurement. In this study, VIS/NIR spectra and cellulose crystallinity were measured for a wheat accession panel with diverse genetic backgrounds. We developed a reliable VIS/NIR model for cellulose crystallinity with a high determination coefficient (R2) (0.95) and residual prediction deviation (RPD) (4.04), enabling the rapid screening of wheat samples. A GWAS of the cellulose crystall

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24

Kun, Eva, and Kálmán Marossy. "Effect of Crystallinity on PLA’s Microbiological Behaviour." Materials Science Forum 752 (March 2013): 241–47. http://dx.doi.org/10.4028/www.scientific.net/msf.752.241.

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Recent work describes changes in polylactic acid samples with different crystallinity during microbiological degradation. We treated PLA at 93°C for different periods of time, which yielded samples with particular crystallinity. The fraction of crystalline phase was determined by differential scanning calorimetry, and the visual effect of crystallinity was measured by colorimetric method with black and white backgrounds. The medium for biological degradation process was living sludge under room temperature and normal atmospheric pressure. Furthermore, the change in mass was also measured. The

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25

Hosseini, S. M. Amin, Martin Schäkel, Ismet Baran, Henning Janssen, Martin van Drongelen, and Remko Akkerman. "Non-uniform crystallinity and temperature distribution during adjacent laser-assisted tape winding process of carbon/PA12 pipes." International Journal of Advanced Manufacturing Technology 111, no. 11-12 (2020): 3063–82. http://dx.doi.org/10.1007/s00170-020-06215-8.

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AbstractThe non-uniform temperature and crystallinity distributions present in carbon fiber–reinforced PA12 composite pipes, produced via laser-assisted tape winding (LATW), are investigated in this paper. The width of the laser source is usually larger than the substrate width which causes multiple heating and cooling of some regions of the (neighboring) substrate and hence temperature and crystallinity gradients during the adjacent hoop winding. A kinematic-optical-thermal (KOT) model coupled with a non-isothermal crystallinity model is developed to capture the transient temperature and crys

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26

Yang, Liulin, Yanming Dong, Xiaolan Hu, and Anhua Liu. "Dendronized CarbohydratesⅡ—Liquid Crystallinity Study." Acta Chimica Sinica 70, no. 1 (2012): 27. http://dx.doi.org/10.6023/a1109097.

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27

Skoulios, A., and D. Guillon. "Amphiphilic Character and Liquid Crystallinity." Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 165, no. 1 (1988): 317–32. http://dx.doi.org/10.1080/00268948808082205.

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28

Stuart, H. A. "PROBLEMS OF HIGH-POLYMER CRYSTALLINITY." Annals of the New York Academy of Sciences 83, no. 1 (2006): 3–19. http://dx.doi.org/10.1111/j.1749-6632.1960.tb40879.x.

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29

Samulski, Edward T. "Macromolecular structure and liquid crystallinity." Faraday Discussions of the Chemical Society 79 (1985): 7. http://dx.doi.org/10.1039/dc9857900007.

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30

Wang, Xuewen, Hong Wang, Yang Gu, et al. "Programmable high crystallinity carbon patterns." 2D Materials 4, no. 2 (2017): 025011. http://dx.doi.org/10.1088/2053-1583/aa59b4.

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31

Isogai, Akira, and Makoto Usuda. "Crystallinity indexes of cellulosic materials." Sen'i Gakkaishi 46, no. 8 (1990): 324–29. http://dx.doi.org/10.2115/fiber.46.8_324.

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32

Chang, Chunrui, Ying Zhao, Ying Liu, and Libao An. "Liquid crystallinity of carbon nanotubes." RSC Advances 8, no. 28 (2018): 15780–95. http://dx.doi.org/10.1039/c8ra00879e.

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33

Gilbert, Marianne. "Crystallinity in Poly(vinyl Chloride)." Journal of Macromolecular Science, Part C: Polymer Reviews 34, no. 1 (1994): 77–135. http://dx.doi.org/10.1080/15321799408009633.

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34

Palmer, D. Jason. "Route to engineering nanoparticle crystallinity." Materials Today 10, no. 10 (2007): 8. http://dx.doi.org/10.1016/s1369-7021(07)70222-5.

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35

Ogawa, Kozo, and Toshifumi Yui. "Crystallinity of PartiallyN-Acetylated Chitosans." Bioscience, Biotechnology, and Biochemistry 57, no. 9 (1993): 1466–69. http://dx.doi.org/10.1271/bbb.57.1466.

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36

Mehmet-Alkan, A. A., and J. N. Hay. "The crystallinity of PEEK composites." Polymer 34, no. 16 (1993): 3529–31. http://dx.doi.org/10.1016/0032-3861(93)90487-u.

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37

Mognonov, D. M., Zh P. Mazurevskaya, V. V. Khakhinov, and O. V. Il’ina. "Manifestations of crystallinity in polyamidobenzimidazoles." Russian Journal of Applied Chemistry 81, no. 8 (2008): 1476–78. http://dx.doi.org/10.1134/s1070427208080302.

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38

Obande, O. P., and M. Gilbert. "Crystallinity changes during PVC processing." Journal of Applied Polymer Science 37, no. 6 (1989): 1713–26. http://dx.doi.org/10.1002/app.1989.070370622.

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39

Richards, R. B. "Polyethylene-structure, crystallinity and properties." Journal of Applied Chemistry 1, no. 8 (2007): 370–76. http://dx.doi.org/10.1002/jctb.5010010812.

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40

Yu, Luping, and Zhenan Bao. "Conjugated polymers exhibiting liquid crystallinity." Advanced Materials 6, no. 2 (1994): 156–59. http://dx.doi.org/10.1002/adma.19940060214.

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41

Ioelovich, Michael. "Accessibility and crystallinity of cellulose." BioResources 4, no. 3 (2009): 1168–77. http://dx.doi.org/10.15376/biores.4.3.1168-1177.

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The accessibility of cellulose samples having various degrees of crystallinity was studied with respect to molecules of water, lower primary alcohols, and lower organic acids. It was found that small water molecules have full access to non-crystalline domains of cellulose (accessibility coefficient α = 1). Molecules of the lowest polar organic liquids (methanol, ethanol, and formic acid) have partial access into the non-crystalline domains ( α <1), and with increasing diameter of the organic molecules their accessibility to cellulose structure decreases. Accessibility of cellulose samples t

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42

STRAUSS, R., G. W. BRÜMMER, and N. J. BARROW. "Effects of crystallinity of goethite: I. Preparation and properties of goethites of differing crystallinity." European Journal of Soil Science 48, no. 1 (1997): 87–99. http://dx.doi.org/10.1111/j.1365-2389.1997.tb00188.x.

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43

TAKEMASA, Takashi, and Satoshi SOMIYA. "Establishment of crystallinity adjusting method of CFRPI, and effect of crystallinity on bending characters." Proceedings of the JSME annual meeting 2002.6 (2002): 307–8. http://dx.doi.org/10.1299/jsmemecjo.2002.6.0_307.

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44

Guggenheim, S., D. C. Bain, F. Bergaya, et al. "Report of the Association Internationale pour l'Etude des Argiles (AIPEA) Nomenclature Committee for 2001: Order, disorder and crystallinity in phyllosilicates and the use of the ‘Crystallinity Index’." Clay Minerals 37, no. 2 (2002): 389–93. http://dx.doi.org/10.1180/0009855023720043.

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AbstractThe purpose of this report is to describe the appropriate use of indices relating to crystallinity, such as the ‘crystallinity index’, the ‘Hinckley index’, the ‘Kü bler index’, and the ‘Árkai index’. A ‘crystalline’ solid is defined as a solid consisting of atoms, ions, or molecules packed together in a periodic arrangement. A ‘crystallinity index’ is purported to be a measure of crystallinity, although there is uncertainty about what this means (see below). This report discusses briefly the nature of order, disorder and crystallinity in phyllosilicates and discusses why the use of a

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45

Shi, Changxia, Michael L. McGraw, Zi-Chen Li, Luigi Cavallo, Laura Falivene, and Eugene Y. X. Chen. "High-performance pan-tactic polythioesters with intrinsic crystallinity and chemical recyclability." Science Advances 6, no. 34 (2020): eabc0495. http://dx.doi.org/10.1126/sciadv.abc0495.

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Three types of seemingly unyielding trade-offs have continued to challenge the rational design for circular polymers with both high chemical recyclability and high-performance properties: depolymerizability/performance, crystallinity/ductility, and stereo-disorder/crystallinity. Here, we introduce a monomer design strategy based on a bridged bicyclic thiolactone that produces stereo-disordered to perfectly stereo-ordered polythiolactones, all exhibiting high crystallinity and full chemical recyclability. These polythioesters defy aforementioned trade-offs by having an unusual set of desired pr

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46

Mayo Greenberg, J., Aigen Li, Tetsuo Yamamoto, and Takashi Kozasa. "On the crystalline silicate component of comet dust." International Astronomical Union Colloquium 150 (1996): 497–506. http://dx.doi.org/10.1017/s0252921100502103.

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AbstractThe effects of preaggregation silicate crystallinity and postaggregation silicate crystallinity on the 11.3μm structure in comet dust emission have been calculated. Of the order of 10 - 20% crystallinity provides the best agreement to date with observation but the fits are not yet fully satisfactory.

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47

Revol, J. F., A. Dietrich, and D. A. I. Goring. "Effect of mercerization on the crystallite size and crystallinity index in cellulose from different sources." Canadian Journal of Chemistry 65, no. 8 (1987): 1724–25. http://dx.doi.org/10.1139/v87-288.

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Native cellulose samples having a wide range of crystallinity and crystallite size were mercerized by treatment with sodium hydroxide. The resultant cellulose II samples showed only a narrow range of crystallinity and an essentially constant crystallite size. For the low-crystallinity samples, crystallinity and crystallite size actually increased on mercerization. These results are in line with the proposal that mercerization involves the mingling of chains from adjacent and antiparallel cellulose I microfibrils to form cellulose II crystals of antiparallel chains.

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48

Aizawa, Takafumi. "Application of CO2-Assisted Polymer Compression to Polylactic Acid and the Relationship between Crystallinity and Plasticization." Compounds 1, no. 2 (2021): 75–82. http://dx.doi.org/10.3390/compounds1020007.

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CO2-assisted polymer compression (CAPC) is an environmentally friendly processing method that uses CO2 to plasticize and crimp polymer fibers at room temperature, enabling low-energy processing within a short time. In this study, CAPC was applied to polylactic acid (PLA), a carbon-neutral polymer. To evaluate the relationships between CO2 plasticization and the crystallinity degree and plasticization of PLA, samples with different degrees of crystallinity were layered and simultaneously compressed to observe the most collapsed layer. The sample with lower crystallinity exhibited better crushin

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49

Katogi, Hideaki, and Kenichi Takemura. "Effect of Crystallinity on Mechanical Properties of Carbon Fiber Reinforced Polypropylene." Key Engineering Materials 577-578 (September 2013): 77–80. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.77.

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In this study, effect of crystallinity on mechanical properties of carbon fiber reinforced thermoplastics (CFRTP) was investigated. Polypropylene (PP) and maleic anhydride modified polypropylene (MAPP) were used as matrix. The crystallinity of PP was controlled by using heat treatment after hot press molding of CFRTP. The range of crystallinity of PP and MAPP were from 26% to 40%. Flexural tests and izod impact tests of CFRTP were conducted based on Japanese Industrial Standard (JIS) K 7074 and JIS K 7110, respectively. As a result, flexural property and izod impact value of CFRTP using PP inc

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50

Tang, Haomiao, Wenbin Wang, Jun Zhou, Tiantian Li, and Zhu Shu. "Optimizing the Crystallinity of Heptazine-Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H2 Evolution." Journal of Nanomaterials 2022 (November 18, 2022): 1–12. http://dx.doi.org/10.1155/2022/4923588.

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Polymeric carbon nitride (PCN), as a metal-free photocatalyst, has drawn wide attention in the photocatalytic H2 evolution. However, the photocatalytic activity of directly synthesized PCN is limited by its low crystallinity. Currently, regulating the melon-based PCN into tri-s-triazine-based crystalline PCN to further optimize its structure has been proved to effectively improve its photocatalytic activity. The heptazine-based crystalline carbon nitride, potassium poly(heptazine imide) (abbreviated as K-PHI), has been used in photocatalytic H2 evolution benefiting from its high crystallinity,

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