Use of Chain-Extended Ureas as Latent Curing Agents and Toughening Modifiers for Epoxy Resin

Abstract

Abstract: Aseries of chain-extended ureas(U_i) containing polyethylene glycol (PEG) flexible spacers were synthesized and the reactive activity, the storage property, dynamic mechanical behavior and impact strength of the epoxy resin/U_i/ dibenzyl amine(DBA) system were studied. The results showed that the storage life of the epoxy resin/U_i/DBAsystem could be delayed to 40 h at 323 Kand the impact strength of the epoxy resin/chain-extended urea containing PEGspacer with molecular weight 600/DBAsystem was about five times higher than that of the epoxy resin/urea without PEGspacer(U_O)/DBAsystem.

Key words: Epoxy resin, Chain extended urea, Polyethylene glycol, Latent curing agent, Toughening modifier

CLC Number:

O631.2

TrendMD:

ZHANG Bao-Long, ZHANG Hui-Qi, YOU Ying-Cai, DU Zong-Jie, DING Pei-Yuan, ZHAI Hua-Chun, HUANG Ji-Fu . Use of Chain-Extended Ureas as Latent Curing Agents and Toughening Modifiers for Epoxy Resin[J]. Chem. J. Chinese Universities, 1998, 19(11): 1837.

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Use of Chain-Extended Ureas as Latent Curing Agents and Toughening Modifiers for Epoxy Resin

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