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Preparation and foamability of high melt strength polypropylene based on grafting vinyl polydimethylsiloxane and styrene
Author(s) -
Zhou Shuai,
Zhao Shicheng,
Xin Zhong
Publication year - 2015
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23889
Subject(s) - materials science , polypropylene , comonomer , styrene , composite material , grafting , polydimethylsiloxane , tacticity , supercritical carbon dioxide , supercritical fluid , izod impact strength test , macromonomer , polymer chemistry , melt flow index , copolymer , polymer , ultimate tensile strength , polymerization , organic chemistry , chemistry
A novel strategy was developed by melt grafting reaction in the presence of macromonomer vinyl polydimethylsiloxane (VS) and comonomer styrene (St) for preparing high melt strength polypropylene (HMSPP), and the rheological behavior, melt strength, and foaming ability of HMSPP were investigated. The results showed that VS and St were successfully grafted onto isotactic polypropylene (iPP), and the melt strength of HMSPP increased by more than 12 times compared to that of the virgin iPP. Moreover, HMSPP exhibited excellent foaming ability with smaller cell size, higher cell density, and higher expansion ratio compared to the virgin iPP when supercritical carbon dioxide was used as the blowing agent. POLYM. ENG. SCI., 55:251–259, 2015. © 2014 Society of Plastics Engineers