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Evolution of double crystal melting peak in polypropylene foam assisted by β‐nucleating agent and supercritical CO 2
Author(s) -
Yu Kesong,
Jiang Hanchuan,
Zhou Hongfu,
Mi Jianguo,
He Yadong,
Wang Xiangdong
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46007
Subject(s) - polypropylene , materials science , differential scanning calorimetry , supercritical fluid , blowing agent , nucleation , branching (polymer chemistry) , composite material , crystal (programming language) , chemical engineering , polymer chemistry , polyurethane , thermodynamics , chemistry , organic chemistry , physics , computer science , engineering , programming language
Polypropylene (PP) foams with double crystal melting peak structure were prepared using supercritical CO 2 as blowing agent. Such structure was induced by the β‐nucleating agent (NA) and dissolved CO 2 in a lab‐scale autoclave system. From the dynamic rheological behaviors, one can see that long chain branching polypropylene (LCBPP) possess better melt elasticity than linear polypropylene (LPP). In order to improve the foamability, LPP was blended with LCBPP. The results of differential scanning calorimeter and wide‐angle X‐ray diffraction indicated that NA was helpful for the introduction of β‐crystal in LPP, but not for LCBPP and PP blends. Therefore, the foamability and the content of β‐crystal of various PP foams can be effectively controlled by adjusting the ratio of LPP and LCBPP. Meanwhile, both the cooling rate and the content of NA affected the formation of β‐crystal in various PP samples. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46007.