Crystallization kinetics of ethylene-co-propylene rubber/isotactic polypropylene blend investigated via chip-calorimeter measurement

Crystallization kinetics of ethylene-co-propylene rubber/isotactic polypropylene blend investigated via chip-calorimeter measurement
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通过芯片量热仪测量研究乙烯-丙烯橡胶/等规聚丙烯共混物的结晶动力学

DOI:
10.1016/j.eurpolymj.2017.09.003
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发表时间:
2017-11
影响因子:
6
通讯作者:
Hu Wenbing
Hu Wenbing
中科院分区:
化学2区
文献类型:
--
作者:
Cai Jun;Luo Ruiqi;Lv Ruihua;He Yucheng;Zhou Dongshan;Hu Wenbing

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快速扫描芯片量热仪Flash DSC 1的差示扫描量热法已被广泛应用于均聚物和无规共聚物的结晶动力学研究。我们扩大了测量的结晶动力学的全同立构聚丙烯(iPP)共混物与29.3重量%的乙烯-共聚-丙烯橡胶(EPR),其中含有39.5重量%的乙烯单体(增韧iPP)。共混物的半结晶时间的温度依赖性显示三个区域的偏离纯iPP的平行结果,反映了相分离和结晶之间的相互作用的效果。我们将高温区较快的结晶归因于两种不相容组分的界面加速了晶体成核,将中温区较慢的结晶归因于次要EPR组分中乙烯序列的结晶阻碍了晶体成核,并将其归因于低-温度区域的结晶成核加速的丙烯序列中的次要EPR组分的结晶。结晶对快速冷却的抑制以及Avrami指数的变化支持中温区结晶竞争的观点。
Differential scanning calorimetry measurement via fast-scan chip-calorimeter Flash DSC1 has been widely applied to investigate the crystallization kinetics of homopolymer and random copolymers. We expanded the measurement to the crystallization kinetics of isotactic polypropylene (iPP) blending with 29.3 wt% ethylene-co-propylene rubber (EPR) that contains 39.5 wt% ethylene monomers (toughening iPP). The temperature dependence of half-crystallization times of the blend show three regions of deviations from the parallel results of pure iPP, reflecting the effect of interplay between phase separation and crystallization. We attributed faster crystallization in the high-temperature region to crystal nucleation accelerated by the interfaces of two incompatible components, attributed slower crystallization in the middle-temperature region to crystal nucleation retarded by the crystallization of ethylene sequences in the minor EPR component, and attributed faster crystallization in the low-temperature region to crystal nucleation accelerated by the crystallization of propylene sequences in the minor EPR component. The suppression of crystallization on fast cooling as well as the variation of Avrami indexes support the scenario of crystallization competition in the middle temperature region.
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