Microstructure of epoxy resin grafted by polyurethane

被引：0
|
作者：
Liu, Fang [1 ]
Ni, Mao-Jun [1 ]
Chen, Yong-Jun [1 ]
Luo, Yuan-Fang [1 ]
Jia, De-Ming [1 ]
机构：
[1] College of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2010年 / 26卷 / 06期
关键词：
Grafting (chemical) - Polyurethanes - Curing - Epoxy resins - Fracture;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Epoxy resins grafted by polyurethane (EP-g-PU) were prepared by reaction of NCO-terminated polyurethane prepolymer with epoxy resin. The effects of content of polyurethane and reactive diluter, diisocyanate structure on Tg and microstructure of cured EP-g-PU were investigated. The DSC results show that Tg of cured EP-g-PU increases with increasing content of polyurethane and decreases with increasing content of reactive diluter. The Tg of cured EP-g-PU derived from different diisocyanate is IPDI>MDI>TDI at the same conditions. The SEM results show that in fracture surface of cured EP-g-PU prepared by IPDI-polyurethane or MDI-polyurethane, epoxy resin is embedded by polyurethane to form a two-phase cell structure. Whereas, in fracture surface of cured EP-g-PU prepared by TDI-polyurethane, polyurethane as the island-phase is dispersed in epoxy resin phase to form an island-sea structure. But a two-phase cell structure of epoxy resin embedded by polyurethane is also observed in the island-phase.
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页码：44 / 47
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