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Bibliographies thématiques / Calcium Pimelate

Littérature scientifique sur le sujet « Calcium Pimelate »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Calcium Pimelate"

1

Thanomchaem, Nattha, et Wunpen Chonkaew. « The Crystallization Kinetics of Polypropylene/Organo Montmorillonite Nanocomposites Modified with Calcium Pimelate ». Advanced Materials Research 747 (août 2013) : 749–52. http://dx.doi.org/10.4028/www.scientific.net/amr.747.749.

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Polypropylene/organo montmorillonite nanocomposites modified with 0.001-0.1 wt% calcium pimelate, a β-nucleating agent, were prepared using twin screw extruder. The effects of calcium pimelate content on crystallization behavior were investigated using differential scanning calorimeter (DSC). The crystallization kinetics were studied using both nonisothermal and isothermal methods. The development of relative crystallinity with the crystallization time was analyzed by the Avrami equation. For nonisothermal studies, the Kissingers theory was employed and the crystallization activation energy was calculated. The results showed that the crystallization temperature shifted to a higher temperature range when calcium pimelate was added. The alpha crystal form of polypropylene nanocomposite was suppressed, by the additions of calcium pimelate, while beta crystallization reaction was accelerated.

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2

Hamza, A., R. K. Arya, A. D. Palsodkar, G. R. Bhadu et S. J. A. Rizvi. « Influence of Crystal Structure on Thermo-Mechanical Properties of Injection Molded 𝛃-Nucleated iPP ». International Polymer Processing 36, n^o 5 (1 novembre 2021) : 545–56. http://dx.doi.org/10.1515/ipp-2020-4106.

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Abstract Isotactic polypropylene (iPP) was nucleated in-situ with calcium pimelate during melt compounding. Calcium pimelate is a highly effective β-nucleator for isotactic polypropylene (iPP). The β-nucleated iPP was characterized by wide angle x-ray diffraction (WAXD) and differential scanning calorimetry (DSC) for its crystallinity and crystal structure. In addition, the injection-molded samples were tested for thermo-mechanical properties. It is found that very low quantity (< 0.1 wt. %) of β-nucleator is required to produce sufficiently high β-crystal fraction (Kβ) in isotactic polypropylene. β-nucleated iPP shows increment of 11 to 14 °C in its heat deflection temperature (HDT). It was also observed that slow cooling rate of β-nucleated iPP promotes the formation of β-crystals and that tensile stretching leads to complete transformation of β crystals into a-crystals at room temperature. It was also revealed that the presence of maleic anhydride grafted polypropylene (PP-g-MA), a well-known coupling agent (or compatibilizer), may reduce the (Kβ) value to a marginal extent. It was also observed that the thermo-mechanical properties were not much affected by the presence of PP-g-MA. Therefore, calcium pimelate may be used as β-nucleator in case of neat as well as reinforced polypropylene containing maleic anhydride as coupling agent.

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3

Dou, Qiang. « Effect of Calcium Salts of Aliphatic Dicarboxylic Acids on the Formation of β Crystalline Form in Isotactic Poly(Propylene) ». Advanced Materials Research 391-392 (décembre 2011) : 875–82. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.875.

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The effects of calcium salts of aliphatic dicarboxylic acids on the polymorphism of iPP have been investigated by means of WAXD, DSC and PLM. It is found that β crystalline form content and nucleation ability of the nucleated iPP are dependent on the carboatomic numbers of the acids. Calcium salts of malonic acid, glutaric acid, pimelic acid and suberic acid are good β nucleators. Calcium salts of succinic acid and adipic acid are α nucleators. Calcium salts of acids with carboatomic numbers of 5 to 8 are good nucleators. The β spherulite size is the smallest in iPP doped with calcium pimelate.

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4

González, Amir, Elías Pérez, Armando Almendarez, Antonio Villegas et Javier Vallejo-Montesinos. « Calcium pimelate supported on TiO2 nanoparticles as isotactic polypropylene prodegradant ». Polymer Bulletin 73, n^o 1 (19 juillet 2015) : 39–51. http://dx.doi.org/10.1007/s00289-015-1469-2.

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5

Broda, Jan, Marcin Baczek, Janusz Fabia et Ryszard Fryczkowski. « Supramolecular structure of polypropylene fibers formed with addition of functionalized graphene oxide ». Textile Research Journal 90, n^o 19-20 (20 avril 2020) : 2322–35. http://dx.doi.org/10.1177/0040517520919752.

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Pimelic acid and calcium hydroxide were used to attach calcium pimelate to the surface of graphene oxide. The additive was mixed with isotactic polypropylene granulate. Neat polypropylene and polypropylene with functionalized graphene oxide was extruded into fibers under laboratory conditions. The gravity spun fibers containing different concentration of the additive and the fibers taken at various velocities were obtained. Morphology and elemental composition of functionalized graphene oxide were studied by means of scanning electron microscopy and energy dispersive X-ray spectroscopy. The structure of fibers was examined by means of differential scanning calorimetry and wide-angle X-ray scattering. The ability of calcium pimelate supported on the surface of the graphene oxide to nucleate the β-form of polypropylene was revealed. A considerable amount of the β-form crystals was obtained in the gravity spun fibers. In the fibers taken at moderate and higher velocities the β-form disappeared. The structure of the fibers extruded with the additive was similar to the structure of the fibers extruded from neat polypropylene. At moderate velocities, the content of mesophase in the structure was high. At higher velocities, the crystalline structure built only from α-form crystals was obtained. The paper presents a discussion of the changes observed in the fiber structure in connection with polypropylene nucleation.

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6

Cao, Jing, Na Wen, Yuying Zheng et Que Chen. « The structure, properties, and foaming of long chain branched polypropylene/clay‐supported calcium pimelate composites ». Polymer Engineering & ; Science 62, n^o 2 (28 décembre 2021) : 553–64. http://dx.doi.org/10.1002/pen.25867.

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7

Zhang, Yue-Fei, Xiang-Feng Lin et Shuai Chen. « Preparation and nucleation effect of a novel compound nucleating agent carboxylated graphene/calcium pimelate for isotactic polypropylene ». Journal of Thermal Analysis and Calorimetry 136, n^o 6 (8 novembre 2018) : 2363–71. http://dx.doi.org/10.1007/s10973-018-7886-3.

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8

Song, Tiantian, Zhongjie Ren, Huihui Li, Xiaoli Sun, Meiling Xue et Shouke Yan. « Modification of illite with calcium pimelate and its influence on the crystallization and mechanical property of isotactic polypropylene ». Composites Part A : Applied Science and Manufacturing 123 (août 2019) : 200–207. http://dx.doi.org/10.1016/j.compositesa.2019.05.018.

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9

Broda, Jan, Janusz Fabia, Marcin Bączek et Czesław Ślusarczyk. « Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide ». Polymers 12, n^o 4 (14 avril 2020) : 910. http://dx.doi.org/10.3390/polym12040910.

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An effective β-nucleating agent for polypropylene crystallization was obtained by the functionalization of reduced graphene oxide with calcium pimelate. The nucleating ability of the modified reduced graphene oxide (rGO-CP) was confirmed during non-isothermal crystallization. In further examinations, the rGO-CP was used as an additive to modify polypropylene fibers. The fibers were extruded in laboratory conditions. Gravity spun fibers containing three different concentrations of the rGO-CP and fibers taken at three different velocities were obtained. The supramolecular structure of the fibers was examined by means of calorimetric and X-Ray Scattering methods (DSC, WAXS, and SAXS). The considerable amount of β-iPP was obtained only in the gravity spun fibers. In the fibers extruded at higher velocities, the diminishing impact of the additive on the fibers structure was revealed. The changes observed in the fiber structure in connection with the impact of the additive on polypropylene crystallization was discussed.

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10

Yue, Yang, Dingding Hu, Qinglong Zhang, Jinyou Lin et Jiachun Feng. « The effect of structure evolution upon heat treatment on the beta-nucleating ability of calcium pimelate in isotactic polypropylene ». Polymer 149 (août 2018) : 55–64. http://dx.doi.org/10.1016/j.polymer.2018.06.060.

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