A new crystallization kinetics study of polycarbonate under high-pressure carbon dioxide and various crystallinization temperatures by using magnetic suspension balance
A new crystallization kinetics study of polycarbonate under high-pressure carbon dioxide and various crystallinization temperatures by using magnetic suspension balance
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DOI：
10.1002/app.32697
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发表时间：
2010-12
影响因子：
3
通讯作者：
G. Li;Chul B. Park
中科院分区：
文献类型：
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作者：
G. Li;Chul B. Park
本文介绍了用磁悬浮天平研究加压超临界CO_2诱导聚碳酸酯(PC)结晶效应的新方法。本研究系统研究了饱和温度和压力对结晶PC结晶动力学和热行为的影响。结果表明，提高CO(2)饱和压力或结晶温度均能有效地促进PC分子链的移动。PC分子链迁移率越高，结晶度越高，熔融温度越高，晶体生长速度越快。然而，随着等温结晶温度从140℃逐渐提高到160℃到180℃，晶体生长尺寸从三维结构转变为一维结构，导致结晶速度总体下降。(C)2010 Wiley期刊公司J Appl Polym Sci 118：2898-2903,2010
A new approach for researching the effects of induced crystallization of polycarbonate (PC) by pressurized supercritical CO(2) using a magnetic suspension balance is described herein. Our study systematically investigated the effects of saturation temperature and pressure on crystallization kinetics and thermal behavior of crystallized PC. It was observed that either increasing the saturation pressure of CO(2) or the crystallization temperature was effective in promoting the mobility of PC's molecular chains. Thermal behavior and crystallization rate were affected in the following manner: a higher PC molecular chain mobility increased the degree of crystallinity, the melting temperature, and the crystal growth rate. However, the crystal growth dimension changed from a three-dimensional to a one-dimensional configuration as the isothermal crystallization temperature was raised incrementally from 140 degrees C to 160 degrees C to 180 degrees C, resulting in an overall decrease in the crystallization rate. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 118: 2898-2903, 2010