Study on Crystallization Kinetics of Partially Melting Polyethylene Aiming To Improve Mechanical Properties
Study on Crystallization Kinetics of Partially Melting Polyethylene Aiming To Improve Mechanical Properties
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旨在提高机械性能的部分熔融聚乙烯结晶动力学研究
DOI：
10.1021/ie500007n
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发表时间：
2014-03
期刊：
影响因子：
--
通讯作者：
Shen, Changyu
中科院分区：
文献类型：
--
作者：
Wang, Zhigang;Dai, Kun;Liu, Chuntai;Shen, Changyu
采用差示扫描量热法和原位傅里叶变换红外光谱法研究了部分熔融的高密度聚乙烯（HDPE）。结果表明，部分熔融的HDPE中可以保留部分未完全熔融的结晶，从而加速后续结晶。此外，还根据FTIR结果对这种不完全熔融晶体进行了定量计算。有趣的是，动力学增强的结晶结果从提高成核速率，因为不完全熔融的晶体。此外，源自部分熔融HDPE的这种令人感兴趣的自成核作用已被有意地应用于实际的聚合物加工，即，挤出，旨在研究部分熔融HDPE对挤出产品的微观结构发展和所得机械性能的影响。出乎意料的是，在拉伸强度的增量已实现在从部分挤压成型的片材。
Partially melting high-density polyethylene (HDPE) is investigated by differential scanning calorimetry and in situ Fourier transform infrared spectroscopy (FTIR) measurements. The results show that some incompletely molten crystals can be preserved in the partially melting HDPE, thus accelerating subsequent crystallization. Moreover, quantitative calculation of such incompletely molten crystals has been done based on the FTIR results. Interestingly, the kinetically enhanced crystallization results from the improved nucleation rate because of the incompletely molten crystals. Furthermore, such interesting self-nucleation originating from the partially melting HDPE has been deliberately applied to practical polymer processing, i.e., extrusion, aiming to investigate the influence of partially melting HDPE on the microstructural development and the resultant mechanical properties of the extruded products. Unexpectedly, an increment in tensile strength has been achieved in the sheets extruded from partially m...
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