聚氨酯胶固化膜的表面化学组成

The Surface Composition ofCured Polyurethane Adhesives

本文采用ESCA技术分析了聚氨酯胶粘剂在不同基膜上固化所成膜的表面化学组成.以N原子百分含量代表聚氨酯胶中硬段组成,发现在非极性基膜上固化,聚氨酯胶膜与空气接触面硬段浓度大于与基膜接触面;而在极性或高表面自由能基膜上固化,聚氨酯胶中硬段组份更趋于向与基膜接触面富集.为此,我们推断聚氨酯胶粘剂对极性、高表面能基膜的粘合机理更趋于聚氨酯中氨基甲酸酯基硬段与基膜相应的酯基或极性基团的相互作用.

The surface composition of polyarethane adhesive films cured on some substrates have been studied by ESCA. It is found by using N-atomic percent to represent the hard segment composition in polyurethane adhesive that the air facing surface has more hard segment as cured on a non-polar substrate and the interface has more hard segment as cured on a polar substrate or one having high surface free energy .The au- thorsinfered that a more suitable bonding mechanism of polyurethane adhesive to substrates having polar groups or high surface free energy is the interaction of car-bamate hard segment with a corresponding polar or ester groups in the substrate surface.