P(BS-co-DGA)共聚物的合成和降解性的研究

Synthesis and Biodegradability of P(BS-co-DGA)

改变二乙醇酸(DGA)的添加量和聚丁二酸丁二醇酯PBS缩合聚合,得到了数均分子质量达6.5万以上的P(BS-co-DGA)二元无规共聚物。使用核磁共振表征了共聚物的化学结构,根据不同DGA的添加量对共聚物的相对分子质量、热性质、力学性能、降解性的影响等进行了研究。结果表明:P(BS-co-DGA)共聚物在较短的反应时间内具有相对高的数均分子质量,分子量分布在2左右;随着DGA添加量的增加,共聚物的Tm和△Hm呈降低趋势;但是所有共聚物的热稳定性没有大的改变,热分解温度均在300℃以上;DGA添加量为2%时在堆肥中的降解速度最快。

P （BS-co-DGA） were synthesized with diglycollic acid replacing succinic acid, and 1,4- butanediol though copolymerization, all the polymers produced exhibited a higher number-average molecular weight than 6.5 × 10^4. The structure of the copolymers was determined by ^1H NMR spectrum, and the diversification of relative molecule weight, thermal property, mechanical property, and biodegradation were studied according to adding different contents of diglycollic acid to copolymers. The results showed that a high numberaverage molecular weight was obtained in a short reaction time and the molecular weight distribution （Mn/Mw） was found to be fewer than 2. Tm, and △Hm, decreased with increasing amount of diglycollate. But there was no great change in thermal stability for all copolymers, thermal degradable temperature than 300℃ higher. The biodegradability of copolymers showed a maximum when 2% diglycollic acid was added.