关键词: 直接酯化缩聚法,    , 分步加料法,    , 聚衣康酸丁二醇酯,    ,  特性黏数

Abstract:       Poly(Butylene Itaconate) (PBI) was synthesized with itaconic acid (IA) and 1,4-butylene glycol (BOD) by direct esterificationpolycondensation (No.1 method) and stepwise feeding process (No.2 method), respectively. The reaction process of two methods was investigated by determining the acid value, the intrinsic viscosity, the relative molecular mass and its distribution. The results showed that the acid value of synthetic PBI by No.1 method was higher than 40 mg(KOH)/g, the intrinsic viscosity was 8.232 1 mL/g, the molecular weight was 2 889, and the molecular weight dispersion coefficient was 1.614. As for No.2 method of synthetic PBI, the acid value was lower than 39.61 mg(KOH)/g, the intrinsic viscosity was 6.697 3 mL/g, the molecular weight was 2 559, and the molecular weight dispersion coefficient was 1.568. The structure of polyester was confirmed by means of Fourier Transform InfraRed (FT-IR). By comprehensive comparison, stepwise feeding process was the better way to synthesize PBI.

Key words: Direct esterification-polycondensation,    , Stepwise feeding process,    , Poly(butylene itaconate),    , Intrinsic viscosity