Influence of Polyether Segment Length on Mechanical Properties of Cured Epoxy Resins Based on Amino-terminated Poly(ethylene glycol) and Diglycidyl Ether of Bisphenol

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (7): 1454.

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Influence of Polyether Segment Length on Mechanical Properties of Cured Epoxy Resins Based on Amino-terminated Poly(ethylene glycol) and Diglycidyl Ether of Bisphenol

ZHAO Li-Ying, MA Hui-Ru, GUAN Jian-Guo*

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Received:2008-11-20 Online:2009-07-10 Published:2009-07-10
Contact: GUAN Jian-Guo. E-mail: guanjg@whut.edu.cn
Supported by:
国家“八六三”计划(批准号: 2006AA03A209)、国防基础科研项目(批准号: D1420061057)和教育部新世纪优秀人才支持计划(批准号: NCET-05-0660)资助.

Abstract

Abstract:

An advanced amorphous AB-type thermosetting resin without nanophase separation was synthesized via directly moulding diglycidyl ether of bisphenol A(DGEBA) and α,ω-bisaminophenyl terminated poly(ethylene glycol)(BATPE). The stress-strain curve, dynamic mechanical thermal analysis and morphologies of impact fracture surfaces of the cured products were investigated as functions of flexible poly(ethylene glycol) segment length(M_PE). The results show that the homogeneous epoxy resin without nanophase separation are available by incorporating poly(ethylene glycol) segments into epoxy crosslinked networks via chemically linked with DGEBA at both terminals, beneficial for increasing free volume fractions and strain relax rates. When M_PE is extended, the glass transition temperature, the room-temperature Young′s modulus and tensile strength of the cured products decrease while toughness, elongation and modulus loss factors increase. The elastic mo-dulus of the cured products at low temperature(i.e. -40 ℃) enhances with increasing M_PE. Consequently, thermosetting epoxy resins based on BATPE-DGEBA which exhibits excellent tensile strength, modulus and impact strength at moderate and low temperature are obtained by facile optimization of M_PE.

Key words: Epoxy resin; Amine-terminated polyether; Nanophase separation; Mechanical property; Dynamic mechanical thermal analysis

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ZHAO Li-Ying, MA Hui-Ru, GUAN Jian-Guo*. Influence of Polyether Segment Length on Mechanical Properties of Cured Epoxy Resins Based on Amino-terminated Poly(ethylene glycol) and Diglycidyl Ether of Bisphenol[J]. Chem. J. Chinese Universities, 2009, 30(7): 1454.

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Influence of Polyether Segment Length on Mechanical Properties of Cured Epoxy Resins Based on Amino-terminated Poly(ethylene glycol) and Diglycidyl Ether of Bisphenol

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