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The mechanism for fracture resistance in β ‐nucleated isotactic polypropylene
Author(s) -
Xu Linli,
Xu Kai,
Zhang Xiuju,
Liu Feiyue,
Chen Mingcai
Publication year - 2010
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1506
Subject(s) - materials science , tacticity , izod impact strength test , nucleation , composite material , morphology (biology) , polypropylene , phase (matter) , spherulite (polymer physics) , ultimate tensile strength , polymer , organic chemistry , chemistry , biology , polymerization , genetics
The effects of molecular weight (MW) of isotactic polypropylene (iPP), the content of β ‐PP, the size of its spherulites and the morphology of its α ‐phase and β ‐phase ( α ‐ and β ‐PP) on the impact strength, with different contents of β ‐nucleating agent, were investigated by two ways. The results show that the impact strength of iPPs increased initially, and then decreased with the content of β ‐nucleating agent (maximum at 0.1 wt%). The impact strength was related to the size of β ‐spherulites and had no apparent correlation with the content of β ‐PP. The morphology of the bundle shape and intercrossing boundaries of β ‐spherulites were dominant in improving impact strength with low content of β ‐nucleating agent, while the MW of iPP was dominant with high content of β ‐nucleating agent. Copyright © 2009 John Wiley & Sons, Ltd.
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