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Annealing Induced Mechanical Reinforcement of Injection Molded iPP Parts
Author(s) -
Pan Yamin,
Liu Xianhu,
Shi Suyu,
Liu Chuntai,
Dai Kun,
Yin Rui,
Schubert Dirk W.,
Zheng Guoqiang,
Shen Changyu
Publication year - 2016
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201600305
Subject(s) - materials science , reinforcement , composite material , annealing (glass)
The mechanical properties and microstructure of injection molded isotactic polypropylene parts with high orientation before and after annealing are analyzed. The mechanical properties of the annealed samples are improved effectively. Through thorough analysis of various structural characterizations, a microstructural model based on the fact that the total length of long period kept constant to analyze the variation of mechanical properties is proposed. It is suggested that the increase of overall crystallinity, the recombination of crystalline phase, and the increase of amorphous phase, respectively, are beneficial for the improvements of the strength, stiffness, and toughness of annealed samples.