期刊
POLYMER INTERNATIONAL
卷 58, 期 7, 页码 838-845出版社
WILEY
DOI: 10.1002/pi.2604
关键词
toughener; epoxy; composites; interface
资金
- Australian Research Council
- UniSA
BACKGROUND: Conventional tougheners for brittle epoxy resins form micrometre-sized particles with ineffective interfaces, and meet toughening requirements with 10-20 wt% of toughener, which unfortunately causes deterioration of other desirable properties. RESULTS: We developed a novel polyurea toughener using a facile synthesis method from isophorone diisocyanate and polyoxyalkyleneamine. Polyurea forms thick-interface particles, and creates an effective toughness improvement: 265% increase in fracture energy release rate. More importantly, polyurea causes no deterioration of other important properties. Different from conventional epoxy/rubber or epoxy/thermoplastic composites, the epoxy/polyurea composite shows Newtonian rheological behaviour, a convenient property for processing. CONCLUSION: This study describes a novel polyurea toughener. Its unique feature is that toughness can be significantly improved at low toughener content (5 wt%) without losing other desirable properties. The study illuminates the importance of the interface for toughening in polymer blends/composites. (C) 2009 Society of Chemical Industry
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