Abstract: The second generation hyperbranched polyester (HBP-0) was synthesized by the pseudo-one step method with 2,2-bis (hydroxyl-methyl) propionic acid as AB₂ monomer, trimethylolpropane as core monomer and p-toluene sulfonic acid as catalyst.HBP-0 was modified with ε-caprolactone and lauric acid to prepare modified hyperbranched polyesters (HBP-1, HBP-2, and HBP-3).The structure and molecular weight of HBPs were characterized by FT-IR,¹H NMR and GPC.HBP-0 was synthesized with 0.43 degree of branching and its molecular weight approached the theoretical value and distribution factor was 1.72.The film properties of modified HBPs cured by toluene diisocyanate adduct were studied, and the results showed that the modified HBPs displayed excellent film properties in the gross, impact resistance, adhesion and flexibility.HBP-3 modified by both ε-caprolactone and lauric acid exhibited the best properties, including lowest viscosity up to 7500 mPa·s, surface drying time of 40 min and pencil hardness of F.While the corresponding data of HBP-1 and HBP-2 modified only by ε-caprolactone or lauric acid were 7×10⁵ mPa·s, 20 min and HB; 17500 mPa·s, 90 min and 2B, respectively.

Key words: hyperbranched polyester, ε-caprolactone, film properties, viscosity

摘要： 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、¹H NMR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7500 mPa·s,涂膜表干40 min,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7×10⁵ mPa·s、20 min和HB及17500 mPa·s、90 min和2B。

关键词: 超支化聚酯, 己内酯, 涂膜性能, 黏度