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Synergistic effects of β‐modification and impact polypropylene copolymer on brittle‐ductile transition of polypropylene random copolymer
Author(s) -
Zhu Yanling,
Luo Feng,
Bai Hongwei,
Wang Ke,
Deng Hua,
Chen Feng,
Zhang Qin,
Fu Qiang
Publication year - 2013
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.39107
Subject(s) - copolymer , polypropylene , materials science , toughness , brittleness , composite material , izod impact strength test , crystallization , ternary operation , polymer , chemical engineering , ultimate tensile strength , computer science , engineering , programming language
In this work, the synergistic effects of β‐modification and impact polypropylene copolymer (IPC) on brittle–ductile (B–D) transition behavior of polypropylene random copolymer (PPR) have been investigated. It is interesting to find that adding both IPC and β‐nucleating agent into PPR has three effects: (i) leading to a significant enhancement in β‐crystallization capability of PPR, (ii) contributing to the shift of B–D transition to lower temperatures, (iii) increasing the B–D transition rate. The reason for these changes can be interpreted from the following two aspects. On one hand, the transition of crystalline structure from α‐form to β‐form reduces the plastic resistance of PPR matrix, thus causing the initiation of matrix shear yielding much easier during the impact process. On the other hand, the well dispersed rubbery phase in IPC with high molecular mobility at relatively low temperatures is beneficial to the shear yielding of PPR matrix and, subsequently, the great improvement in impact toughness of the ternary blends. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013