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首页> 外文期刊>Journal of Applied Polymer Science >Melting behavior and nonisothermal crystallization kinetics of polyamide 6/polyamide 66 molecular composites via in situ polymerization
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Melting behavior and nonisothermal crystallization kinetics of polyamide 6/polyamide 66 molecular composites via in situ polymerization

机译：原位聚合制备聚酰胺6 /聚酰胺66分子复合材料的熔融行为和非等温结晶动力学

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摘要

The melting behavior and nonisothermal crystallization kinetics of pure polyamide 6 (PA 6) and its molecular composites with polyamide 66 (PA 66) were investigated with differential scanning calorimetry. The PA 6/PA 66 composites had one melting peak, whereas the coextruded PA 6/PA 66 blends had two melting peaks. With the addition of PA 66 to PA 6 via in situ anionic polymerization, the melting temperature, crystallization temperature, and crystallinity of PA 6 in the composites decreased. The half-time of nonisothermal crystallization increased for a PA 6/PA 66 molecular composite containing 12 wt % PA 66, in comparison with that of pure PA 6. The commonly used Ozawa equation was used to fit the nonisothermal crystallization of pure PA 6 and its composites. The Ozawa exponent values in the primary stage were equal to 1.28-3.03 and 1.28-2.97 for PA 6 and its composite with 12 wt % PA 66, respectively, and this revealed that the mechanism of primary crystallization of PA 6 and PA 6/PA 66 was mainly heterogeneous nucleation and growth. All the results indicated that the incorporation of PA 66 into PA 6 at the molecular level retarded the crystallization of PA 6. (c) 2005 Wiley Periodicals, Inc.
机译：用差示扫描量热法研究了纯聚酰胺6（PA 6）及其与聚酰胺66（PA 66）的分子复合物的熔融行为和非等温结晶动力学。 PA 6 / PA 66复合材料具有一个熔融峰，而共挤出的PA 6 / PA 66共混物则具有两个熔融峰。通过原位阴离子聚合将PA 66添加到PA 6中，复合材料中PA 6的熔融温度，结晶温度和结晶度降低。与纯PA 6相比，含有12 wt％PA 66的PA 6 / PA 66分子复合材料的非等温结晶半衰期增加。常用的Ozawa方程用于拟合纯PA 6和PA 6的非等温结晶。它的复合材料。对于PA 6及其与12 wt％PA 66的复合材料，初级阶段的Ozawa指数值分别等于1.28-3.03和1.28-2.97，这表明PA 6和PA 6 / PA的初次结晶机理66主要是异质形核和生长。所有结果表明，在分子水平上将PA 66掺入PA 6阻碍了PA 6的结晶。（c）2005 Wiley Periodicals，Inc.

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