CET/CBT开环共聚酯的合成、结构和性能  

Synthesis,structure and properties of CET/CBT ring-opening copolymerized polyesters

作　　者：刘明[1] 王松林 李院院 高倩倩[1] 潘鹏举[1] 包永忠[1] LIU Ming;WANG Songlin;LI Yuanyuan;GAO Qianqian;PAN Pengju;BAO Yongzhong(State Key Laboratory of Chemical Engineering(Zhejiang University),College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Zhejiang Heng-Yi Petrochemical Co.Ltd.,Hangzhou 311029,China)

机构地区：[1]化学工程联合国家重点实验室(浙江大学),浙江大学化学工程与生物工程学院,浙江杭州310058 [2]浙江恒逸石化有限公司,浙江杭州311029

出　　处：《高校化学工程学报》2024年第6期909-915,共7页Journal of Chemical Engineering of Chinese Universities

摘　　要：环状对苯二甲酸乙二醇酯低聚物(CET)与环状对苯二甲酸丁二醇酯低聚物(CBT)开环共聚,不仅可以降低开环聚合温度,而且还可调节共聚酯的综合性能。采用自制的CET与商品化CBT熔融开环共聚制备共聚酯,研究了投料CET与CBT质量比对共聚酯平均分子量、组成和序列分布、结晶和结晶熔融、动态力学特性的影响。在300℃下聚合10min可得到平均分子量大的共聚酯,当投料单体中CET质量分数为50%~60%时,共聚酯的平均分子量较大;当CET与CBT质量比大于或等于1:1时,分子链具有较高的无规度;CET质量分数为50%的共聚酯的结晶熔融温度最低为181.1℃,而CET质量分数为70%的共聚酯的结晶度和结晶速率最小;随着CET质量分数增大,不同组成共聚酯的储能模量和玻璃化温度均呈增大趋势。Ring-opening copolymerization of cyclic ethylene terephthalate(CET)oligomer with cyclic butylene terephthalate(CBT)oligomer can reduce polymerization temperatures and produce polyesters with adjustable properties.Copolyesters were synthesized by ring-opening copolymerization using self-prepared CET and commercial CBT,and effects of CET/CBT mass ratios in feed monomer on molecular weights,compositions and sequence structure,crystallization,melting,and dynamic viscoelastic behavior of copolyesters were investigated.Copolyesters with high molecular weights can be prepared through ring-opening copolymerization of CET and CBT for 10 min at 300℃,especially for copolymerization system with CET mass fraction from 50%to 60%.When the ratio of w(CET)to w(CBT)is greater than or equal to 1:1,the molecular chain has a high degree of randomness.The copolyester with 50%mass fraction of CET has the lowest crystal melting temperature(181.1℃),while the copolyester with 70%mass fraction of CET has the lowest crystallization rate.The storage modulus and glass transition temperatures of copolyesters are increased as CET composition in copolyester increased.

关 键 词：环状对苯二甲酸乙二醇酯低聚物 环状对苯二甲酸丁二醇酯低聚物 开环聚合 共聚酯 结晶 

分 类 号：TQ465.92[化学工程—制药化工]