本体法制备了聚氨酯接枝及互穿网络改性环氧树脂，研究了酸酐为固化荆的条件下，制备工艺及聚合物结构对聚氨酯（PU）改性E-51环氧树脂（EP）性能的影响。实验确定了异氰酸酯的官能度、聚丙二醇（PPG）的分子量及聚氨酯懒聚体含量等对改性产物冲击强度、微观形貌及热性能的影响。结果表明，改性材料冲击强度随PPG分子量的增高而增大；互穿网络（IPN）结构改性E．51的抗冲击性能优于接枝改性，冲击断裂面上阻碍裂纹发展的点明显多于后者；支化PU改性E-51热稳定性高于线形PU改性，280℃热失重接近未改性环氧树脂。
polyurethane (PU) grafted diglycidyl ether of bisphenol-A (DGEBA) and interpenetrating polymer network (PU/DGEBA IPN) were synthesized via solventless preparation and cured by liquid anhydride. The impact strength, dynamic mechanical properties, morphology and thermal gravity loss were investigated. The results indicate that the impact strength increases by 100% than of virgin DGEBA when PU content is 38 phr. PU/E-51 IPN structure shows 20% higher of the impact strength than PU grafted E-51 with the same PU content. SEM figure shows the distinct difference between PU grafted DGEBA and PU/DGEBA IPN. The mass loss of DGEBA modified by PAPI is 0.7 % at 280℃, which is approximate to that of virgin epoxy.
参考文献
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