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首页> 外文期刊>Journal of Applied Polymer Science >Blends of polypropylene resins with a liquid crystalline polymer. I. Isothermal crystallization
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Blends of polypropylene resins with a liquid crystalline polymer. I. Isothermal crystallization

机译：聚丙烯树脂与液晶聚合物的共混物。 I.等温结晶

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The isothermal crystallization kinetics of blends of different polypropylene (PP) resins and a liquid crystalline polymer (LCP) after two different melting conditions (200 and 290degreesC) were studied by DSC and polarized light optical microscopy. The resins were a homopolymer (hPP), a random copolymer with ethylene (cPP), and a maleic anhydride grafted PP (gPP). The LCP was Vectra A950, a random copolymer made of 75 mol % of 4-hydroxybenzoic acid and 25 mol % of 2-hydroxy,6-naphthoic acid. It was observed that the overall crystallization rates of all the blends after melting at 200degreesC were higher than those after melting at 290degreesC. The LCP acted as a nucleating agent for all the PP resins; however, its nucleating effect was stronger for the hPP than for the cPP and gPP resins. After both melting conditions, an increase was observed in the overall crystallization rate of the hPP and gPP resins with the increase in the amount of LCP, but not in the cPP crystallization rate. The fold surface free energy a, of hPP and cPP in the blends decreased, but increased in the gPP blends. Finally, all the PP resins formed transcrystallites on the LCP domain surfaces. (C) 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 916 -930, 2003. [References: 33]
机译：通过DSC和偏振光光学显微镜研究两种不同熔融条件（200和290degreesc）后不同聚丙烯（PP）树脂（PP）树脂（PP）树脂和液晶聚合物（LCP）的等温结晶动力学。树脂是均聚物（HPP），随机共聚物，与乙烯（CPP）和马来酸酐接枝PP（GPP）。 LCP是Vectra A950，一种随机共聚物由75mol％的4-羟基苯甲酸和25mol％的2-羟基，6-萘甲酸制成。观察到，在200degreesc熔化后所有共混物的整体结晶速率高于290degreesc熔化后的整体结晶速率。 LCP作为所有PP树脂的成核剂作用;然而，其成核效果比HPP更强，而不是CPP和GPP树脂。在熔化条件下，在HPP和GPP树脂的总结晶速率下观察到增加，随着LCP的量，但不在CPP结晶速率的增加。混合物中的HPP和CPP的折叠表面自由能A降低，但在GPP共混物中增加。最后，所有PP树脂在LCP畴表面上形成过晶岩。 （c）2002 Wiley期刊，Inc.J Appl Poly Poly SCI 87：916 -930,2003。[参考文献：33]

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