环氧基POSS/PAMAM杂合材料的制备及性能研究

Preparation and Properties of Epoxy-Based POSS/PAMAM Hybrid Materials

摘要:

以3-缩水甘油基氧丙基三甲氧基硅烷（EPTMS）为原料，合成得到了八官能团缩水甘油醚-多面体低聚倍半硅氧烷（简称POSS-EP）。采用4代树形端氨基聚酰胺-胺（PAMAM）作为不同比例的POSS-EP和双酚A型（DGEBA）环氧共混物的固化剂，制备了一系列环氧基POSS/PAMAM杂化材料。通过动态差示扫描量热仪(DSC)，对环氧共混物和PAMAM固化反应的热行为进行了表征，并用Kissinger方程模拟计算了固化反应的活化能（Ea）。通过DSC、热重分析(TGA)和拉力测试，考察了POSS-EP/DGEBA不同比例对杂化材料的热稳定性能和力学性能的影响。研究结果表明，由于POSS基团的存在和PAMAM树形分子构效关系的影响，这种环氧基杂化材料表现出优良的热稳定性和力学性能。

Abstract:

Glycidyl ether polyhedral oligomeric silsesquioxanes (POSS-EP) was prepared in high yield by hydrolysis and condensation of 3-glycidyloxypropyltrimethoxysilane (EPTMS). Through a thermal copolymerization between G4 PAMAM dendrimers and blends of POSS-EP and bisphenol A epoxy resin (DGEBA), a series of epoxy-based POSS/PAMAM hybrid materials was obtained. Thermal copolymerization reaction was characterized by differential scanning calorimetry (DSC) and a reaction activation energy (Ea) was calculated by Kissinger’s model. Thermal and mechanical properties for the hybrid materials obtained under different copolymerization conditions were studied by DSC, thermogravimetric analysis (TGA) and tensile test. The results revealed that owing to the presence of POSS groups and the specific role of structure-properties relationship for PAMAM tree-structure, these epoxy-based POSS/PAMAM hybrid materials exhibited excellent thermal stabilities and mechanical properties.