羧基单体对脂肪族聚酯性能的影响

Effect of Carboxyl Monomer on Properties of Aliphatic Polyester

以1,4-丁二醇和3种不同的羧基单体为反应物,通过溶液聚合法合成3种脂肪族聚酯——聚(丁二酸丁二酯)(PBS)、聚(己二酸丁二酯)(PBA)和聚(辛二酸丁二酯)(PBSub)。利用红外光谱、核磁共振、差示扫描量热、热重分析、拉伸测试等分析手段对3种聚酯的结构、热性能和力学性能进行分析,并对所合成聚酯的酶促降解性能进行了研究。结果表明,3种脂肪族聚酯综合性能较优,热分解温度均高于328℃,热稳定性良好;力学性能测试发现三者断裂伸长率均在300%以上;酶解实验表明,24h时3种聚酯的失重率超过90%,可降解性良好。随着羧基单体中亚甲基数目的增加,脂肪族聚酯的拉伸强度降低,但聚酯断裂伸长率和酶降解性能提高。

Three different aliphatic polyesters, poly (butylene succinate)(PBS), poly(butylene adipate)(PBA) and poly(butylene suberate)(PBSub), were synthesized by solution polycondensation using 1,4-butanediol as hydroxyl monomers, succinic acid, adipic acid, and suberic acid as carboxyl monomers, respectively. FT-IR, NMR, DSC, TG, testing machine were used to characterize the structure, thermal stability, mechanical properties and biodegradability of three different kinds of aliphatic polyesters. All the three different kinds of polyesters exhibit good performances. The thermal decomposition temperature of the polyesters is higher than 328 ℃, and the thermal stabilities are well. The elongation at break of the aliphatic polyesters is above 300%. The biodegradation rate of the three polyesters is more than 90% after 24 h, and the biodegradability is excellent. The results show that with the increase of methylene groups in the carboxyl monomers, the tensile strength decreases, but the elongation at break and biodegradability increase.