生物基丁二酸中杂质含量对生物可降解共聚酯性能的影响

以生物发酵法制备的生物基1,4-丁二酸(SA)为单体原料,结合石油基化学法制备的1,4-丁二醇和对苯二甲酸,以自主开发的稀土-其他金属复合体系为催化剂制备了生物可降解聚(对苯二甲酸丁二醇-丁二酸丁二醇)酯(PBTS)。研究了不同来源的SA以及SA在生物发酵制备过程中引入的不同杂质含量对PBTS性能的影响。采用GPC技术测定PBTS的相对分子质量及其分布。GPC测试结果显示,PBTS的相对分子质量显著增大,分布变宽。实验结果表明,采用生物基SA单体合成PBTS时,应选择粒径规整、松散和较大粒径的SA单体;SA单体中单官能团有机酸和无机盐的存在会使PBTS产品力学性能下降,颜色发黄。

Effects of Impurity Contents in Bio-Based Succinic Acid on Properties of Biodegradable Poly(Butylenes Succinic-co-Butylene Terephthalate)

Aliphatic-aromatic copolyesters,poly(butylenes succinic-co-butylene terephthalate)(PBTS),were synthesized via direct polycondensation from petroleum-based 1,4-butanediol and terephthalic acid together with bio-based succinic acid(SA) with a rare earth compound as the catalyst.The effects of different SA and the contents of impurities derived from biological fermentation of SA preparation on the properties of PBTS were investigated.GPC was used to characterize the relative molecular weight and distribution of PBTS,and the results showed that the relative molecular mass significantly increased and its distribution became wider.The results indicate that the SA monomer with regular,loose and bigger particles size are preferable for the synthesis.The mechanical properties of PBTS lowered and PBTS turned to yellow due to the existence of organic acid and inorganic salt in the SA monomer.