CAJ | 학술논문

以不同数均分子量(-Mn )的端羟基聚丁二烯(HTPB)为增韧剂,4,4-二氨基二苯甲烷为固化剂,考察了 HTPB 的-Mn 及用量对环氧树脂的冲击强度、拉伸性能、热稳定性及微观形貌的影响。结果表明,在胺类固化体系中,当 HTPB 的-Mn 为2300~3500且质量分数为1%~3%时,其对环氧树脂具有较佳的增韧效果,且不会对热稳定性产生太大的影响；随着 HTPB 用量的增加,改性环氧树脂中大尺寸橡胶粒子增多,且 HTPB 的-Mn 越大,改性环氧树脂中橡胶粒径越大,断裂面由光滑的脆性断裂特性变为粗糙、存在大量应力纹及应力发白区域的韧性断裂特性,再到平滑断裂和大尺度的橡胶颗粒两相分布的低韧性特性。
이불동수균분자량(-Mn )적단간기취정이희(HTPB)위증인제,4,4-이안기이분갑완위고화제,고찰료 HTPB 적-Mn 급용량대배양수지적충격강도、랍신성능、열은정성급미관형모적영향。결과표명,재알류고화체계중,당 HTPB 적-Mn 위2300~3500차질량분수위1%~3%시,기대배양수지구유교가적증인효과,차불회대열은정성산생태대적영향；수착 HTPB 용량적증가,개성배양수지중대척촌상효입자증다,차 HTPB 적-Mn 월대,개성배양수지중상효립경월대,단렬면유광활적취성단렬특성변위조조、존재대량응력문급응력발백구역적인성단렬특성,재도평활단렬화대척도적상효과립량상분포적저인성특성。
Effects of number average molecular weight and amount of hydroxyl-terminated polybuta-diene (HTPB) on the impact strength,tensile proper-ties,thermal stability and morphology of the toughened epoxy resins were investigated with diamino diphenyl methane(DDM) as curing agent. The results showed that for amine-cured epoxy resin system, HTPB had a better toughening effect and no siginificant impact on thermal stability when its number average molecular weight ranged between 2 300 and 3 500, and mass fraction in epoxy resin from 1% to 3%. With the in-crease of HTPB, the sample fracture changed from smooth brittle fracture to rough ductile one with a great number of stress cracks and stress whitening zones, again to a low tough smooth fracture with two-phase distribution of large sized rubber particles.