Crystallization kinetics of glass fiber reinforced PBT composites
Crystallization kinetics of glass fiber reinforced PBT composites
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DOI：
10.1002/1097-4628(20001017)78:3
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发表时间：
2000-10
影响因子：
3
通讯作者：
Chan-Seok Park;Kieup Lee;J. Nam;Seong-Woo Kim
中科院分区：
文献类型：
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作者：
Chan-Seok Park;Kieup Lee;J. Nam;Seong-Woo Kim
通过等温和非等温条件下的结晶动力学研究了玻璃纤维对聚对苯二甲酸丁二酯（PBT）结晶的影响。从熔融结晶和溶剂结晶的PBT复合材料的交叉极化光学显微照片中发现，玻璃纤维增加了晶体的数量密度，减小了晶体的尺寸。在等温实验中，玻璃纤维提供了非均相成核位点，从而提高了PBT的整体结晶速率。然而，Avrami指数和状态转变不受玻璃纤维存在的显著影响。对于PBT复合材料的非等温动力学，模型预测在大多数结晶范围内都很好，但在结晶70%以上，特别是在快速冷却速率（> - 40°C/min）时，模型预测偏差较大。模型的这种差异似乎是由于生长模式的转变，特别是在高过冷时，这种转变被清楚地观察到。©2000 John Wiley & Sons, Inc应用化学学报，2004,31 (2):576-585
The effect of glass fibers on the crystallization of poly(butylene terephthalate) (PBT) was investigated by crystallization kinetics analysis under isothermal and nonisothermal conditions. From the crosspolar optical micrographs of melt- and solvent-crystallized PBT composites, the glass fibers were found to increase the number density and decrease the size of crystallites. The glass fibers provided heterogeneous nucleation sites, and thus enhanced the overall rate of PBT crystallization in isothermal experiments. However, the Avrami exponent and the regime transitions were not significantly affected by the presence of glass fibers. For the nonisothermal kinetics of PBT composites, the model prediction was excellent in most ranges of crystallization, but it deviated above 70% of crystallization especially at fast cooling rates (>40°C/min). This discrepancy of the model seemed to result from the growth regime transitions, which were clearly observed especially at high undercoolings. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 576–585, 2000