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化工学报  2013 

超支化聚酯的端基改性及其涂膜性能

DOI: 10.3969/j.issn.0438-1157.2013.06.045, PP. 2240-2246

Keywords: 超支化聚酯,己内酯,涂膜性能,黏度

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Abstract:

以三羟甲基丙烷为核多元醇,二羟甲基丙酸为AB2型单体,对甲苯磺酸为催化剂准一步法合成了第二代超支化聚酯(HBP-0)。HBP-0分别经己内酯和月桂酸改性得到改性超支化聚酯(HBPs)。采用FT-IR、1HNMR和GPC对HBP-0的结构和相对分子质量进行表征,发现超支化聚酯的支化度为0.43,相对分子量与理论相对分子量比较接近,相对分子质量分布系数只有1.72。以甲苯二异氰酸酯加成物为交联剂,考察了改性超支化聚酯交联涂膜性能,结果表明,3种改性超支化聚酯的涂膜性能在光泽度、耐冲击性、附着力和柔韧性方面表现十分优异。其中HBP-3同时用己内酯和月桂酸改性具有最佳性能,黏度最低为7500mPa·s,涂膜表干40min,且硬度达到F。而单独用己内酯或月桂酸改性的HBP-1和HBP-2的相应数据分别为7×105mPa·s、20min和HB及17500mPa·s、90min和2B。

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