一种新型可降解共聚物薄膜的制备与性能研究

在氩气环境下,以丁二酸、己二酸、1,4-丁二醇和尿素为原料,通过高温熔融缩聚和扩链反应合成了一种新型可降解丁二酸/己二酸-1,4-丁二醇-尿素聚酯酰脲共聚物,并用压延成膜法制备了共聚物薄膜.采用红外光谱、热重分析、差示量热扫描及万能拉力机对共聚物薄膜的结构与性能进行了表征.结果表明,随着己二酸含量的增加,聚合物薄膜的熔点、结晶度和结晶温度均明显下降.当n（SA）∶n（AA）=1∶1时,共聚物大部分为无定形区域,结晶性能大大降低,水解速率最快,薄膜的降解性能最好.通过调节丁二酸与己二酸添加的物质的量之比,可使聚酯酰脲薄膜在热学性能、力学性能和降解性能之间达到一定程度的可控性.

Preparation and Properties of a Novel Biodegradable Copolymer Film

acid-butanediol urea) copolymer was prepared by melt phase polycondensation and chain extension reaction with succinic acid, adipic acid, 1,4-butanediol and urea as raw materials, under an atmosphere of argon gas through high temperature melt reaction. Then the copolymer film was prepared through rolling film-forming method. The structure and properties of copolymer films were identified and tested by infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and universal tensile machine. The results showed that, with the increase of adipic acid content, the melting point, crystallinity and crystallization temperature of polymer film decreased obviously. Under the condition of n(SA):n(AA)=1:1, most part of copolymer was the amorphous region with the crystallization performance being reduced greatly, hydrolysis rate being the fastest and the degradation property of copolymer film being the best. The properties of copolymer films could be controlled effectively in thermodynamic property, mechanical property and degradation property by adjusting the ratio of adipic acid and succinic acid.