Crystallization kinetics and morphology of nylon 1212
Crystallization kinetics and morphology of nylon 1212
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DOI：
10.1016/j.polymer.2004.03.027
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发表时间：
2004-05-11
期刊：
影响因子：
4.6
通讯作者：
Zhao, QX
中科院分区：
文献类型：
--
作者：
Ren, MQ;Mo, ZS;Zhao, QX
用偏光显微镜研究了尼龙1212的等温和非等温结晶过程。在182-132℃的等温条件下测量的尼龙1212的晶体生长速度与非等温程序(冷却速度0.5-11℃/分钟)测量的晶体生长速度非常接近。在得到尼龙1212热力学参数的基础上，用Hoffman-Lauritzen成核理论对动力学数据进行了检验。经典的区域I-->；II和区域II-->；III分别发生在179℃和159℃的温度下。以(100)晶面为生长平面，计算了晶体生长参数。体制I-->；II-->；III的转变伴随着从椭圆形结构到带状球晶再到非带状球晶的形态转变。在等温和非等温过程中的形态发展表现出很好的一致性。(C)2004爱思唯尔有限公司。保留所有权利。
The isothermal and non-isothermal crystallization processes of nylon 1212 were investigated by polarized optical microscopy. The crystal growth rates of nylon 1212 measured in isothermal conditions at temperatures ranged from 182 to 132 degreesC are well comparable with those measured by non-isothermal procedures (cooling rates ranged from 0.5 to 11 degreesC/min). The kinetic data were examined with the Hoffman-Lauritzen nucleation theory on the basis of the obtained values of the thermodynamic parameters of nylon 1212. The classical regime I --> II and regime II --> III transitions occur at the temperatures of 179 and 159 degreesC, respectively. The crystal growth parameters were calculated with (100) plane assumed to be the growth plane. The regime I --> II --> III transition is accompanied by a morphological transition from elliptical-shaped structure to banded spherulite and then non-banded spherulite. The development of morphology during isothermal and non-isothermal processes shows a good agreement. (C) 2004 Elsevier Ltd. All rights reserved.