【摘要】 工业中大量生产的端羟基聚醚 ,由于羟基的反应活性不够 ,不能直接用于增韧胺类固化的环氧树脂 .Bu2 SnO Bu3PO4 缩合物能催化羟基对环氧基的加成反应 .本文研究在Bu2 SnO Bu3PO4 缩合物Sn P6 70 0的存在下以端羟基聚四氢呋喃 (PTMG)增韧芳香胺 4,4′ 二氨基二苯砜 (DDS)固化的环氧树脂 .PTMG首先与环氧树脂反应生成嵌段共聚物 ,在固化时发生微相分离 .分散相的尺寸在有利于增韧的范围内 .PTMG在分子量与浓度适当时 ,能使树脂的断裂韧性大大提高 ;抗弯强度也有显著提高 ,而Tg 和模量略有降低 .更多还原

【Abstract】 The hydroxyl terminated polyethers, though industrially widely available,have not been used as tougheners for amine cured epoxy resins. The Bu 2SnO Bu 3PO 4 condensate Sn P6700 was used to catalyze the addition of hydroxyl group to epoxy group. In the presence of this catalyst hydroxyl terminated poly(tetramethylene glycols)(PTMG) were used directly as the toughener for the epoxy resin with 4,4′ diamino diphenyl sulfone as the curing agent. PTMG was first reacted with the epoxy resin to form block copolymers. Micro phase separation took place upon curing. The particle size of the dispersed phase was in the range of 0 4 to 1 4 μm when the molecular weight was in the range of 700 to 2000,which was favorable to the toughening. When ca. 5 phr of PTMG was used as modifier, the toughness of the cured resin was improved greatly with a slight lowering of T g and modulus.更多还原