聚氨酯预聚物 meaning in Chinese

polyurethane prepolymer

The preparation method of silylated polyurethane sealant and the influences of different silanes on sealant properties are also described
介绍了硅烷偶联剂改性聚氨酯预聚物的方法和密封胶的配制以及不同的硅烷偶联剂对改性聚氨酯密封胶性能的影响。
( 3 ) volume shrinkage of composite decreases greatly with wpu increasing , even can arrive a negative number , but thermal stability is still good . ( 4 ) toughening mechanism is that : the formation of high molecular linear amino formate construct is the toughening reason ; hydroxyl - terminated pu - prepolymer and pf react to produce chemical bond effect which participate cure ; carboxyl - terminated pu - prepolymer and pf form semi - ipn which make toughened pf occur maximum
（ 4 ）通过红外光谱对pf / pu共混物分子结构进行的定性分析、以及扫描电镜对冲击断面形貌进行的分析，可证明聚氨酯预聚物增韧酚醛树脂的机理是：两个体系都是由于高分子量的线形氨基甲酸酯结构而增韧；端羟基pu与pf在共固化中产生化学键效应，参与pf的固化；而端羧基pu则与pf形成半互穿网络而增韧。