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首页> 外文期刊>Journal of Applied Polymer Science >Isothermal and nonisothermal crystallization kinetics of partially melting nylon 10 12
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Isothermal and nonisothermal crystallization kinetics of partially melting nylon 10 12

机译：部分熔融的尼龙10 12的等温和非等温结晶动力学

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摘要

Nylon 10 12, a newly industrialized engineering plastic, shows a double-melting phenomenon during melting. Partial melts were obtained when the sample was heated to the temperature between the two melting peaks. A differential scanning calorimeter was used to monitor the energies of the isothermal and nonisothermal crystallization from the partially melted samples. During isothermal crystallization, relative crystallinity develops with a time dependence described by the Avrami equation, with the exponent n = 1.0. For nonisothermal studies, kinetics treatments based on the Avrami and Ozawa equations are presented to describe the crystallization process. It was found that the two treatments can describe the nonisothermal crystallization from the partially melted samples. The derived Avrami and Ozawa exponents are all about 1.0, which means that the partially melted samples crystallize by one-dimensional growth, which may cause thickening of the lamellae. We calculated the crystallization activation energies for isothermal and nonisothermal crystallization from the partially melted samples. It was found that the activation energy determined by the Kissinger method was not rational, which may be attributed to the free-nucleation process for nonisothermal crystallization from partially melted samples. (C) 2003 Wiley Periodicals, Inc. [References: 18]
机译：新型工业化的工程塑料尼龙10 12在熔化过程中出现双重熔化现象。当将样品加热到两个熔融峰之间的温度时，获得了部分熔融。差示扫描量热仪用于监测部分熔融样品的等温和非等温结晶的能量。在等温结晶过程中，相对结晶度随时间的变化而变化，该时间依赖性由Avrami方程描述，指数n = 1.0。对于非等温研究，提出了基于Avrami和Ozawa方程的动力学处理来描述结晶过程。发现这两种处理可以描述部分熔融样品的非等温结晶。导出的Avrami和Ozawa指数均为1.0，这意味着部分熔化的样品通过一维生长而结晶，这可能会导致薄片变厚。我们从部分熔化的样品中计算了等温和非等温结晶的结晶活化能。发现通过基辛格方法确定的活化能不合理，这可能归因于从部分熔化的样品中进行非等温结晶的自由成核过程。 （C）2003 Wiley Periodicals，Inc. [参考：18]

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