论文部分内容阅读
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。
Using succinic acid-butanediol-urea (PBSu) polyesterurea copolymer and adipic acid-butanediol-urea (PBAu) polyesterurea urea as prepolymer, toluene- Isocyanate (TDI) is a chain extender, and the biodegradable polyesterurea block copolymer (PBSu-co-PBAu) was successfully prepared by melt copolymerization. The structure and properties of the copolymer were characterized by 1HNMR, TG, DSC, XRD, universal tensile testing machine and water degradation test performance. The study found that with the increase of PBAu content, the plasticity of the block copolymer increased. The synthesized block copolymer has excellent thermal stability and good biodegradability, and has better tensile properties than the homopolymers PBSu and PBAu and the unmodified polyester PBS and PBA. In addition, it is also possible to adjust the thermal, degradative and mechanical properties of the material by varying the feed ratios of PBSu and PBAu.