A new grafting monomer for synthesizing long chain branched polypropylene through melt radical reaction

A new grafting monomer for synthesizing long chain branched polypropylene through melt radical reaction
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熔融自由基反应合成长链支化聚丙烯的新型接枝单体

DOI:
10.1016/j.polymer.2011.11.033
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发表时间:
2012-01
期刊:
影响因子:
4.6
通讯作者:
Zhang, Zhijie
Zhang, Zhijie
中科院分区:
化学2区
文献类型:
--
作者:
Xing, Haiping;Wang, Lu;Tang, Tao;Zheng, Jun;An, Yanjie;Zhang, Zhenjiang;Wan, Dong;Tan. Haiying;Zhang, Zhijie

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采用含有两个不同反应活性的碳碳双键的接枝单体(对(3-丁烯基)苯乙烯,BS))进行熔融自由基反应制备长链支化聚丙烯(LCB-PP)。高温尺寸排阻 (HT-SEC) 与三重检测器、流变仪和 NMR 相结合,用于表征所得 LCB-PP 的微观结构。 BS在介导自由基反应方面表现出双重功能,即稳定大分子自由基和促进支化反应。与苯乙烯和二乙烯基苯相比,使用BS作为接枝单体导致在PP主链上形成更均匀分布的LCB结构。因此,所得样品在拉伸流动中表现出应变硬化并具有高熔体强度。
A grafting monomer (p-(3-butenyl)styrene, BS)) containing two carbon–carbon double-bonds with different reactivity was used in melt radical reaction to prepare long chain branched polypropylene (LCB-PP). High-temperature size-exclusion (HT-SEC) coupled with triple detectors, rheometer and NMR were used to characterize the microstructure of the resultant LCB-PP. BS showed double functions in mediating radical reaction, i.e. stabilizing macroradicals and promoting branching reaction. Compared to styrene and divinylbenzene, using BS as a grafting monomer led to the formation of more uniformly distributed LCB structure on the PP backbone. Thus the resultant sample showed strain hardening in extensional flow and had high melt strength.
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