A new grafting monomer for synthesizing long chain branched polypropylene through melt radical reaction
2011; Elsevier BV; Volume: 53; Issue: 1 Linguagem: Inglês
10.1016/j.polymer.2011.11.033
ISSN1873-2291
AutoresZhenjiang Zhang, Dong Wan, Haiping Xing, Zhijie Zhang, Haiying Tan, Lu Wang, Jun Zheng, Yanjie An, Tao Tang,
Tópico(s)Advanced Polymer Synthesis and Characterization
ResumoA 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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