Effect of nucleating agents on crystallization kinetics of PET
Effect of nucleating agents on crystallization kinetics of PET
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DOI：
10.3144/expresspolymlett.2007.37
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发表时间：
2007-04-01
影响因子：
3.3
通讯作者：
Chen, X. D.
中科院分区：
文献类型：
--
作者：
Jiang, X. L.;Luo, S. J.;Chen, X. D.
滑石粉、苯甲酸钠（SB）和离子单体（Ion）三种成核剂的成核效果。采用差示扫描量热法（DSC）和偏光显微镜（POM）研究了钠离子（Na+）对聚对苯二甲酸乙酯（PET）结晶的影响，通过Avrami方程和Ozawa方程获得了结晶动力学参数。利用Hoffman-Lauritzen理论计算了纯PET和PET/成核剂共混物的折叠面自由能sigma(e)。结果表明，三种成核剂通过提高成核效果来提高结晶速率常数，其中在相同含量下SB的成核效果最好。成核剂的加入使PET的结晶方式由三维生长转变为二维生长。PET/成核剂共混物的sigma(e)值远小于纯PET， PET/SB（99:1）共混物的sigma(e)值最小（18.2 mJ/m(2)）。基于Hoffman理论的结论与Avrami方程和Ozawa方程的分析结果相似。
Effects of three nucleating agents concluding talc, sodium benzoate (SB) and an ionomer (Ion., Na+) on crystallization of poly(ethylene terephthalate) (PET) were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM), the parameters of crystallization kinetics were obtained through Avrami and Ozawa equations. The fold surface free energy sigma(e) of pure PET and PET/nucleating agent blends was calculated by Hoffman-Lauritzen theory. The results indicate that the three kinds of nucleating agents increase the crystallization rate constant through promoting their nucleating effect for PET crystallization, among which SB is the best one with the same content. The crystallization mode of PET might shift from three-dimensional growth to two-dimensional growth by the addition of the nucleating agents. The values of sigma(e) of PET/nucleating agent blends are much less than that of pure PET, and PET/SB (99:1) blend has the least value of sigma(e) (18.2 mJ/m(2)). The conclusion based on Hoffman theory is similar to the analysis by Avrami and Ozawa equations.