Crystallization behavior of partially melted poly(ether ether ketone) Influence of pre-crystallization conditions
Crystallization behavior of partially melted poly(ether ether ketone) Influence of pre-crystallization conditions
复制标题
部分熔融聚醚醚酮的结晶行为 预结晶条件的影响
DOI：
10.1007/s10973-017-6229-0
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发表时间：
2017
影响因子：
4.4
通讯作者：
Shen Changyu
中科院分区：
文献类型：
--
作者：
Wang Yaming;Wang Yu;Lin Qing;Cao Wei;Liu Chuntai;Shen Changyu
采用差示扫描量热法研究了部分熔融聚醚醚酮（PEEK）的结晶行为。详细研究了预结晶条件的影响。部分熔融后，在随后的冷却过程中，最大峰向更高的温度移动8.4-11.8 °C，表明自成核显著提高了PEEK的总体结晶速率。一个有趣的发现是，PEEK的自成核温度域在熔融曲线之外，并且其幅度非常大（28-35 °C）。此外，样品预结晶非等温或从玻璃态表现出更大的自成核效应，和更大的自成核温度域。采用Avrami模型对等温结晶数据进行了分析。Avrami指数被发现是显着不同的熔体有和没有自成核效应，表明自成核改变PEEK的结晶机制。
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 °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 °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.