含PBSu和PBAu链段可降解聚酯酰脲的合成及性能研究

Synthesis and Properties of Polyester Ureide Multiblock Copolymers Composed of Poly(butylene-succinate-uera) and Poly(adipate-succinate-uera)

以丁二酸-丁二醇-尿素(PBSu)聚酯酰脲共聚物与己二酸-丁二醇-尿素(PBAu)聚酯酰脲共聚物为预聚物,甲苯-2,4-二异氰酸酯(TDI)为扩链剂,通过熔融共聚成功地制备了可降解聚酯酰脲嵌段共聚物(PBSu-co-PBAu)。采用核磁共振氢谱(1HNMR)、热重分析仪(TG)、差示扫描量热仪(DSC)、X射线衍射仪(XRD)、万能拉力试验机以及水降解测试表征了共聚物的结构与性能。研究发现,随着PBAu含量的增加,嵌段共聚物塑性提高。合成得到的嵌段共聚物具有优异的热稳定性能和良好的生物降解性能,且具有比均聚物PBSu和PBAu以及未改性的聚酯PBS和PBA更好的拉伸性能。此外,还可以通过改变PBSu和PBAu的进料比,对材料的热性能、降解性能和力学性能进行一定范围的调节。

A series of polyester ureidemultiblock copolymers（PBSu-co-PBAu） composed of the preprepared poly（butylene-succinate-urea）（PBSu） and poly（adipate-succinate-uera）（PBAu） were successfully synthesizedby melt polymerization processes with toluene-2,4-diisocyanate（TDI） as a chain extender.Then the structure,thermal properties,mechanical properties and biodegradable properties of the copolymers were characterized by means of1H-NMR,DSC,TG,XRD,universal tensile machine and hydrolytictest respectively.The results indicated that the toughness of multiblock copolymers was enhanced by the incorporation of PBAu.The multiblock copolymers possessed excellent thermal stability and biodegradable properties,as well as tensile properties superiorto the homopolymers PBSu and PBAu,the unmodified-PBS and-PBA.Besides,the thermal properties,biodegradability and mechanical properties of the multiblock copolymers can be adjusted by varying the dose of PBSu and PBAu.