Comparing crystallization kinetics among two G-resin samples and iPP via Flash DSC measurement
Comparing crystallization kinetics among two G-resin samples and iPP via Flash DSC measurement
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通过 Flash DSC 测量比较两种 G 树脂样品和 iPP 的结晶动力学
DOI：
10.1007/s10973-017-6095-9
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发表时间：
2017-06-01
影响因子：
4.4
通讯作者：
Hu, Wenbing
中科院分区：
文献类型：
--
作者：
Kalapat, Duenpen;Tang, Qiyun;Hu, Wenbing
利用快速扫描芯片量热仪FlashDSC1比较了两个G树脂样品(主要是不同相对分子质量的中国石化MT12-S和MT18-S与少量1-丁烯随机共聚合的等规聚丙烯)和均聚物等规聚丙烯(IPP)的非等温结晶动力学和等温结晶动力学。结果表明，两个G树脂样品的结晶速度均比iPP慢，结晶速率随温度变化的差异揭示了共聚单体对聚合物结晶的化学限制作用。此外，MT18-S在低温下的结晶速度略快于MT12-S，这可以归因于其相对较低的相对分子质量有利于在低温区具有较高的分子流动性。
We employed the fast-scan chip-calorimeter Flash DSC1 to compare the non-isothermal and isothermal crystallization kinetics among two G-resin samples (mainly separate in different molecular weights of isotactic polypropylene randomly copolymerized with a few 1-butene in SINOPEC brand MT12-s and MT18-s) and homopolymer isotactic polypropylene (iPP, similar molecular weights). The results show that two G-resin samples crystallize slower than iPP, and their differences in the temperature dependence of crystallization rates reveal the chemical confinement effect of comonomers on polymer crystallization. Furthermore, MT18-s crystallizes slightly faster than MT12-s at low temperatures, which can be attributed to its relatively low molecular weight benefiting a high molecular mobility in the low-temperature region.