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论文类型：期刊论文

发表时间：2017-08-01

发表刊物：JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

收录刊物：SCIE、EI、Scopus

卷号：129

期号：2

页面范围：1021-1028

ISSN号：1388-6150

关键字：Poly(ether ether ketone); Partial melting; Crystallization behavior; Thermal analysis

摘要：The crystallization behavior of partially melted poly(ether ether ketone) (PEEK) was investigated by differential scanning calorimetry. The influence of pre-crystallization conditions was studied in details. After partial melting, the maximum peak shifts to higher temperature by 8.4-11.8 A degrees C during subsequent cooling, indicating that self-nucleation remarkably enhanced the overall crystallization rate of PEEK. An interesting finding is that the self-nucleation temperature domain of PEEK is way outside the melting curve, and its magnitude is greatly large (28-35 A degrees C). Moreover, samples that were pre-crystallized nonisothermally or from the glassy state exhibit a larger self-nucleation effect, and a larger self-nucleation temperature domain. The isothermal crystallization data were analyzed by the Avrami model. The Avrami exponent is found to be remarkably different for melts with and without self-nucleation effects, indicating that self-nucleation changes the crystallization mechanism of PEEK.