CRYSTALLIZATION PROCESSES IN POLY(ETHYLENE-TEREPHTHALATE) AS MODIFIED BY POLYMER ADDITIVES AND FIBER REINFORCEMENT
CRYSTALLIZATION PROCESSES IN POLY(ETHYLENE-TEREPHTHALATE) AS MODIFIED BY POLYMER ADDITIVES AND FIBER REINFORCEMENT
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DOI：
10.1002/app.1994.070520508
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发表时间：
1994-05-02
影响因子：
3
通讯作者：
REBENFELD, L
中科院分区：
文献类型：
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作者：
REINSCH, VE;REBENFELD, L
采用差示扫描量热法研究了纤维增强对聚对苯二甲酸乙二醇酯（PET）结晶动力学的影响。 本研究的目的是确定纤维增强对PET结晶的影响是如何通过聚合物成核和增塑添加剂的存在来修改的。采用芳纶和玻璃纤维在PET中制备了单向纤维复合材料。PET的结晶速率，如由结晶半衰期所反映的，被认为取决于增强纤维类型、结晶温度以及成核剂或增塑剂的存在。然而，PET的结晶度在很大程度上不受添加剂和增强纤维的存在的影响。结晶动力学分析使用Avrami模型PET体积结晶作为时间的函数。PET和纤维增强PET的Avrami图显示出两个线性区域，可能对应于初级和次级结晶。纤维增强PET的结晶形态也使用偏振光显微镜进行了研究。有关成核密度和生长形态的结果用于解释纤维增强系统中结晶动力学的差异。(C)John Wiley & Sons，Inc.
The effect of fiber reinforcement on the crystallization kinetics of poly(ethylene terephthalate), or PET, was investigated using differential scanning calorimetry. The objective of the study was to determine how the effects of fiber reinforcement on PET crystallization are modified by the presence of polymer nucleating and plasticizing additives. Unidirectional fiber composites were prepared using aramid and glass fibers in PET. The rate of crystallization of PET, as reflected by crystallization half-time, is seen to depend on reinforcing fiber type, crystallization temperature, and presence of nucleant or plasticizer. However, degree of crystallinity of PET is largely unaffected by the presence of additives and reinforcing fibers. Crystallization kinetics are analyzed using the Avrami model for PET volume crystallized as a function of time. Avrami plots for PET and fiber-reinforced PET exhibit two linear regions, possibly corresponding to primary and secondary crystallization, The crystalline morphology of fiber-reinforced PET was also studied using polarized light microscopy. Results concerning nucleation density and growth morphology are used in explaining differences seen in crystallization kinetics in fiber reinforced systems. (C) 1994 John Wiley & Sons, Inc.