Strain‐induced crystallization behavior of poly(ether ether ketone) (PEEK)
Strain‐induced crystallization behavior of poly(ether ether ketone) (PEEK)
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聚醚醚酮 (PEEK) 的应变诱导结晶行为
DOI：
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发表时间：
1988
期刊：
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通讯作者：
R. Weiss
中科院分区：
文献类型：
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作者：
M. Chien;R. Weiss
用平行板流变仪研究了聚醚醚酮（PEEK）的应变诱导结晶。实验变量包括预热时间、结晶温度和剪切速率。结晶动力学的特征在于通过定义为从剪切开始到结晶开始所经过的时间的诱导时间。实验结果表明，PEEK应变诱导结晶的诱导时间明显短于静态条件下的结晶诱导时间，且应变诱导结晶的温度依赖性远小于静态结晶。应变诱导晶化的激活能为0.035kcal/mole，这比静态晶化的激活能小得多。剪切试样的显微照片表明PEEK微晶沿沿着取向。
Strain-induced crystallization of poly(ether ether ketone) (PEEK) was studied by the use of a parallel plate rheometer. The experimental variables included preheating time, crystallization temperature, and shear rate. The crystallization kinetics were characterized by means of an induction time defined as the time elapsed from the start of shearing to the onset of crystallization. The experimental results showed that the induction time for strain-induced crystallization of PEEK was significantly shorter than that for crystallization under quiescent condition, and that strain-induced crystallization was much less temperature dependent than quiescent crystallization. The activation energy for strain-induced crystallization was found to be 0.035kcal/mole, which was considerably smaller than the reported activation energy for quiescent crystallization. Photomicrographs of the sheared specimens indicated that PEEK crystallites orient along the flow direction.