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Artículos de revistas sobre el tema "Calcium Pimelate"

Autor: Grafiati
Publicado: 6 de septiembre de 2023

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1

Thanomchaem, Nattha y Wunpen Chonkaew. "The Crystallization Kinetics of Polypropylene/Organo Montmorillonite Nanocomposites Modified with Calcium Pimelate". Advanced Materials Research 747 (agosto de 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 y 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 de noviembre de 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 (diciembre de 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 y Javier Vallejo-Montesinos. "Calcium pimelate supported on TiO2 nanoparticles as isotactic polypropylene prodegradant". Polymer Bulletin 73, n.º 1 (19 de julio de 2015): 39–51. http://dx.doi.org/10.1007/s00289-015-1469-2.

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5

Broda, Jan, Marcin Baczek, Janusz Fabia y Ryszard Fryczkowski. "Supramolecular structure of polypropylene fibers formed with addition of functionalized graphene oxide". Textile Research Journal 90, n.º 19-20 (20 de abril de 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 y 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 de diciembre de 2021): 553–64. http://dx.doi.org/10.1002/pen.25867.

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7

Zhang, Yue-Fei, Xiang-Feng Lin y 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 de noviembre de 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 y 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 (agosto de 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 y Czesław Ślusarczyk. "Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide". Polymers 12, n.º 4 (14 de abril de 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 y Jiachun Feng. "The effect of structure evolution upon heat treatment on the beta-nucleating ability of calcium pimelate in isotactic polypropylene". Polymer 149 (agosto de 2018): 55–64. http://dx.doi.org/10.1016/j.polymer.2018.06.060.

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11

Cao, Jing, Na Wen y Yuying Zheng. "The preparation of calcium pimelate modified OMMT from natural Ca-montmorillonite and its application as β-nucleating agent for polypropylene". Polymer Testing 65 (febrero de 2018): 352–59. http://dx.doi.org/10.1016/j.polymertesting.2017.11.031.

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12

Dou, Qiang. "A Comparison of the Effects of Calcium Glutarate and Pimelate on the Formation of β Crystalline Form in Isotactic Poly(propylene)". Journal of Macromolecular Science, Part B 47, n.º 1 (diciembre de 2007): 127–38. http://dx.doi.org/10.1080/00222340701746119.

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13

Liu, Huiqin y Jiachun Feng. "Effect of calcium pimelate on crystallization kinetics of polyphenylene sulfide". Journal of Applied Polymer Science, 8 de agosto de 2023. http://dx.doi.org/10.1002/app.54519.

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AbstractThe use of nucleating agents (NAs) to accelerate semicrystalline polymers crystallization is a widely recognized technique during processing. However, the commercially available NA for poly(phenylene sulfide) (PPS) has been rather limited. In this work, it is found that calcium pimelate (CaPim), a commercial nucleating agent for isotactic polypropylene, could also accelerate the crystallization process of PPS. The influence of CaPim addition on the crystallization behaviors of PPS was investigated under non‐isothermal and isothermal condition. Upon the addition of 0.3 wt% CaPim, the crystallization peak temperature and the onset crystallization temperature increases by 5.3 and 8.4°C at 10°C/min cooling rate, and the half‐time of crystallization reduces 51% at crystallization temperature of 272°C. Polarized optical observation revealed a substantial enhancement in nucleation due to the presence of CaPim. Avrami equation analysis suggested that the nucleating agent significantly increased the crystallization rate constant without affecting the growth dimension. Moreover, Lauritzen–Hoffman theory analysis indicateed that the addition of CaPim lowers the nucleation energy barrier, contributing to its high‐nucleation efficiency. These findings demonstrate that calcium pimelate holds promise as an effective nucleating agent for PPS.
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14

Zhang, Yue‐Fei, Xiang‐Feng Lin y Hui Hu. "Combined effect of chemically compound graphene oxide‐calcium pimelate on crystallization behavior, morphology and mechanical properties of isotactic polypropylene". Polymers for Advanced Technologies, 19 de mayo de 2020. http://dx.doi.org/10.1002/pat.4950.

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15

Xie, Li, Jin‐Rong Zhong, Yan Li y Yue‐Fei Zhang. "In situ synthesis of calcium pimelate as a highly dispersed β‐nucleating agent for improving the crystallization behavior and mechanical properties of isotactic polypropylene". Polymers for Advanced Technologies, 11 de octubre de 2022. http://dx.doi.org/10.1002/pat.5894.

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