Curing process of 1,3-di(2'-aminoethyl)-2-methylimidazolium bromide with epoxy resin E-51
A diaminoimidazole ionic liquid curing agent,1,3-di(2'-aminoethyl)-2-methylimidazolium bromide(DAIL)is prepared via quaternization of imidazole rings.With epoxy resin E-51 as matrix resin,the curing process conditions of DAIL as curing agent and the properties of cured products are studied in depth.The results show that DAIL can be used as a medium temperature curing agent for epoxy resins.The optimal ratio of the two is DAIL:E-51=20:100,the optimal curing temperature range is 74～105℃,and the post-curing temperature is 162 ℃.The tensile strength of the cured cast body splines is 159 MPa,the elastic modulus is 2 281 MPa,and the elongation at break is 12.8％,the thermal decomposition temperature is 424.4 ℃.DMA analysis shows that the maximum loss factor tan8 of the DAIL/E-51 cast body is 0.56,and the glass transition temperature θg is 83 ℃,the corresponding storage modulus E is 290 MPa,and the crosslinking density is 30 149 mol·m-3.This study provides an important experimental basis for the use of high mechanical properties of medium temperature epoxy resin curing agent.
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