AA/PTA单体比例对PBAT共聚酯性能的影响  

Effect of monomer ratio of AA to PTA on properties of PBAT copolyesters

作　　者：赵彩霞[1] 柏祥[1] 邹国享[1] 何英杰[1] 李锦春[1] 

机构地区：[1]江苏省材料表面科学与技术重点实验室,常州大学,江苏常州213164

出　　处：《化工学报》2017年第1期452-459,共8页CIESC Journal

基　　金：江苏省青年基金项目(BK20130255);江苏省高校自然科学研究面上项目(15KJB150001)~~

摘　　要：以己二酸(AA)、对苯二甲酸(PTA)和1,4-丁二醇(BDO)为原料,钛酸四丁酯为催化剂,采用先酯化后缩聚的两步聚合法制备了一系列聚(己二酸/对苯二甲酸丁二醇)(PBAT)共聚酯。研究己二酸与对苯二甲酸不同摩尔比对合成共聚酯的结构、热性能和弹性性能的影响。FTIR和NMR测试结果表明本实验成功合成了PBAT共聚酯。GPC测试结果表明共聚酯的重均分子量(M_w)在41000~142000之间,测试结果与特性黏度具有一致性。DSC测试结果表明随己二酸含量的增加,共聚酯的熔融温度和结晶温度逐渐降低;WXRD测试结果表明随着己二酸含量的不断增加,共聚酯的晶型结构逐渐由PBA转变为PBT;DMA结果表明玻璃化转变温度(T_g)基本呈不断降低的趋势;TGA结果表明PBAT共聚酯的初始分解温度随对苯二甲酸含量的增加向高温区移动,而在高温段共聚酯的热稳定性接近。拉伸结果表明,AA/PTA比例的变化显著影响共聚酯的力学弹性,PBAT7:3具有最大的断裂伸长率,而PBAT3:7则表现为强而韧的拉伸特性。Poly（butyleneadipate-co-terephthalate）（PBAT） copolyesters were synthesized from adipic acid（AA）, p-phthalic acid（PTA） and 1,4-butanediol（BDO） with tetrabutyl titanate as catalyst through a two-step process of esterification and polycondesation. The effects of molar ratio of AA to PTA on the structures, thermal and elastic properties of copolyesters were studied. FTIR and NMR test results showed that PBAT copolyesters were successfully synthesized. GPC test showed the molecular weight（Mw） of copolyesters were between 41000—142000, which was consistent with the result of the intrinsic viscosity. DSC results showed that Tm and Tc were gradually reduced with the increase of adipic acid. WXRD test results indicated that with the increase of adipic acid, the crystal structure copolyesters gradually changed from PBA into PBT. DMA results showed that the Tg of copolyesters trended to decrease with the increase of adipic acid. From TGA curves, the initial decomposition temperature of PBAT copolyesters shifted to the high temperature zone, while the thermal stability of the copolyesters closed at high temperature. It was found from the tensile test that the AA/PTA ratio significantly affected the mechanical properties of copolyesters. PBAT7：3 was of the maximum elongation at break, and PBAT3：7 was of strong and tough tensile properties.

关 键 词：PBAT 合成 单体比例 热性能 力学性能 

分 类 号：TQ245.12[化学工程—有机化工]