摘要：
A melt polycondensation method was used to synthesize poly (1, 2-propylene-PBS-1, 6-hexamethylenediamine) (1, 2-BPO-PBS-1, 6-UMBTAD) copolymers with different branched chain contents. The structure of the polyester amide copolymer was analyzed. Its thermal properties were studied and the rheological properties were determined with a rotary rheometer. Moreover, effects of branched chain contents and processing temperature on copolymer rheological properties were discussed. Copolymer membranes were prepared via a calendered forming method following rheological properties and their performance was evaluated. The results show that the melt temperature of the copolymer is ~100°C and the thermal decomposition temperature is higher than 340°C. Copolymer viscosity decreases with the increase of branched chain content under same temperature. The copolymer shows weaker non-newtonian properties when the ratio of branched chain/linear chain is 1:4. Shear rate has few effects on copolymer shear stress at higher branched chain contents. With the increase of branched chain contents, the tensile strength of the copolymer films decreases constantly and the breaking elongation decreases after initial increase. The copolymer films show best mechanical performance when the branched chain/linear chain ratio is 1:6.%采用熔融缩聚法合成一系列支链含量不同的聚1,2-丙二醇-丁二酸-丁二醇-1,6-己二胺(1,2-BPO-PBS-1,6-UMBTAD)共聚物.对其进行了结构分析,研究了聚合物热学性能,并采用旋转流变仪测定了其流变性能,探讨了不同支链含量、不同加工温度对共聚物流变性能的影响.以流变性能测试为指导,采用压延成膜法制备了共聚物薄膜,并对其性能测试.结果表明:合成的聚合物熔融温度在100°C 左右,热分解温度高于340°C;在相同温度下,随着支链含量的增加,聚合物黏度不断下降,当支链/直链比值达到1:4时,聚合物表现出更弱的非牛顿性;随着温度的上升,聚合物黏度也随之下降;聚合物剪切应力随着剪切速率的增加而增大;支链含量越高,聚合物剪切应力受剪切速率的影响越小.随着支链含量的不断增大,聚酯酰胺共聚物薄膜拉伸强度不断变小,断裂伸长率先变大后减小;当支链/直链比值为1:6时,聚合物薄膜力学性能最佳.
