Structural characteristics and properties of polyurethane modified TDE-85/MeTHPA epoxy resin with interpenetrating polymer networks

来源期刊:中南大学学报(英文版)2008年第3期

论文作者:李芝华 黄耀鹏 任冬燕 郑子樵

文章页码:305 - 308

Key words:polyurethane; epoxy resin; interpenetrating polymer networks; tensile strength; impact strength; thermal stability

Abstract: Diglycidyl-4, 5-epoxycyclohexane-1, 2-dicarboxylate(TDE-85)/methyl tetrahydrophthalic anhydride (MeTHPA) epoxy resin was modified with polyurethane(PU) and the interpenetrating polymer networks(IPNs) of PU-modified TDE-85/MeTHPA resin were prepared. The structural characteristics and properties of PU-modified TDE-85/MeTHPA resin were investigated by Fourier transform infrared(FTIR) spectrum, emission scanning electron microscopy(SEM) and thermogravimetry(TG). The results indicate that epoxy polymer network (Ⅰ) and polyurethane polymer network (Ⅱ) of the modified resin can be obtained and the networks (Ⅰ) and (Ⅱ) interpenetrate and tangle highly each other at the phase interface. The micro morphology presents heterogeneous structure. The integrative properties of PU-modified TDE-85/MeTHPA epoxy resin are improved obviously. The PU-modified TDE-85/ MeTHPA resin’s tensile strength reaches 69.39 MPa, the impact strength reaches 23.56 kJ/m, the temperature for the system to lose 1% mass (t1%) is 300 ℃, and that for the system to lose 50% mass (t50%) is 378 ℃. Compared with those of TDE-85/MeTHPA resin, the tensile strength, impact strength, t1% and t50% of the PU-modified resin increases by 48%, 115%, 30 ℃, 11 ℃, respectively. The PU-modified TDE-85/MeTHPA resin has the structure characteristics and properties of interpenetrating polymer networks.

基金信息:the National High-Tech Research and Development Program of China

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