Comparative study of the kinetics of non-isothermal melt solidification of random copolymers of butene-1 with either ethylene or propylene
Comparative study of the kinetics of non-isothermal melt solidification of random copolymers of butene-1 with either ethylene or propylene
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DOI：
10.1007/s00396-014-3224-x
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发表时间：
2014-04
影响因子：
2.4
通讯作者：
I. Stolte;R. Androsch
中科院分区：
文献类型：
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作者：
I. Stolte;R. Androsch
对丁烯-1/丙烯无规共聚物和丁烯-1/乙烯无规共聚物的非等温熔体凝固动力学进行了比较。在结晶相中的双孔链段之间的距离的分析揭示了包含丙烯链缺陷到晶体中，而乙烯共单元被排除在结晶之外。由于丙烯和乙烯链缺陷参与结晶的接受程度不同，在无规丁烯-1/乙烯共聚物中，熔体转变为有序相的动力学明显较慢。对于相似的共聚单元浓度的样品，结晶温度的降低和抑制有序/结晶的临界冷却速率的降低在无规丁烯-1/乙烯共聚物中比在丁烯-1/丙烯共聚物中更高。由于在晶体生长前沿需要排除乙烯共聚单元，最终，丁烯-1/乙烯共聚物中的最大结晶度低于具有相似量共聚单元的丁烯-1/丙烯共聚物。
The kinetics of non-isothermal melt solidification of random butene-1/propylene copolymers has been compared with that of random butene-1/ethylene copolymers. Analysis of the distance between neighbored chain segments in the crystal phase revealed inclusion of propylene chain defects into crystals, while ethylene co-units are excluded from crystallization. As a consequence of different acceptance of propylene and ethylene chain defects to participate in crystallization, the kinetics of the transition of the melt into ordered phase is significantly slower in random butene-1/ethylene copolymers. For samples of similar co-unit concentration, the decrease of the crystallization temperature and of the critical cooling rate to suppress ordering/crystallization is higher in random butene-1/ethylene copolymers than in butene-1/propylene copolymers. Due to the required rejection of ethylene co-units at the crystal growth front, ultimately, the maximum crystallinity is lower in butene-1/ethylene copolymers than in butene-1/propylene copolymers of similar amount of co-units.