高相对分子质量聚丁二酸丁二醇酯的合成与表征

以丁二酸和丁二醇为原料,十氢萘为溶剂,在140~200℃反应12~14 h,进行直接聚合,合成了高相对分子质量聚丁二酸丁二醇酯(PBS)。用FTIR和1HNMR确定了产物为预期化学结构。考察了6种催化剂的催化效果,结果表明,催化剂的催化效果按SnC l2>Ti(OBu)4>Ti(iOPr)4>Sn(Oct)2>Zn(Ac)2≈p-TS顺序递减,SnC l2具有最高的催化效率,以它为催化剂得到的PBS数均相对分子质量达到79 000,产率达到96.0%。当PBS的数均相对分子质量达到40 000以上时,具有很好的力学性能,拉伸强度达到35 MPa,可代替通用塑料。PBS具有良好的生物降解性能,在45 d时生物降解量达到49%,可用作生物降解材料。

Synthesis and Characterization of High Relative Molecular Mass Poly(butylene succinate)

High relative molecular mass poly(butylene succinate)(PBS) was synthesized by direct polycondensation of succinic acid and 1,4-butanediol in decalin solution at 140～200 ℃ for 12～14 h.Its structure was characterized by FTIR and ~1HNMR.The effect of six types of catalysts was also investigated.The results showed that the activities of these catalysts descended in the order of SnCl_2>Ti(OBu)_4>Ti(iOPr)_4>Sn(Oct)_2>Zn(Ac)_2≈p-TS,and SnCl_2 exhibited the highest catalytic efficiency in the synthesis of PBS,with which high relative molecular mass PBS(M_n=(79 000)) was obtained in 96.0% yield.PBS shows good mechanical properties when its M_n is over(40 000),the tensile strength reached 35 MPa,and it can be substituted for conventional plastics.PBS shows good biodegradability in the biodegradation test,and about 49% weight loss occurred after 45 d,so it can be used as biodegradable materials.