Study on Factors of Mechanical Properties of GAP Curing Films

摘要

Modified glycidylazide polymer (GAP) as binder, influence on mechanical performance of GAP binder films were investigated with application of bis(2,2-dinitropropyl)formal/ bis(2,2-dinitropropyl)acetal (BDNPF/A, A3) as plasticizer, trimethylolpropane (TMP) as crosslink agent and toluene-2,4-diisocyanate / desmodur (TDI/N-100) as curing agents by means of static strength tensile, dynamic thermo-mechanical analysis and magnetic resonance crosslink density analysis.It wasfound that the increase of plasticizing ratio(P/Po) from 0.8 to 1.6 lead to sacrifice of tensile strength and crosslink density from 0.153MPa,6.7×10-5 mol/ml to 0.053MPa,4.3×105mol/ml, respectively, with subtle improvement of elongation from 160.8％ to 204.2％.Great improvement of mechanical properties has been achieved by adjusting the percentage of TDI/N-100, especially when RN-100=0.36 and RTDI=1.44, the tensile strength was 0.125MPa and the elongation at break was 570.5％.While there was no positive effect obviously observed in the curing system by the addition of TMP.