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用熔融缩聚法合成了一系列的聚丁二酸丁二醇酯(PBS)和聚丁二酸丁二醇酯/对苯二甲酸丁二醇酯(PBST)。GPC检测显示聚合物分子量为8×104,通过1HNMR图谱分析了聚合物的序列分布,发现PBT比例(XPBT)为33mol%时聚合物嵌段性最强。DSC/TG曲线上可以观察到随着XPBT增加玻璃化温度(Tg)升高、熔点(Tm)先降低后上升,热分解温度由367.74℃上升到372.95℃。力学性能检测显示硬段的加入改善了PBS的耐热性和力学性能。
A series of polybutylene succinate (PBS) and polybutylene succinate / polybutylene terephthalate (PBST) were synthesized by melt polycondensation. GPC analysis showed that the molecular weight of the polymer was 8 × 104, and the sequence distribution of the polymer was analyzed by1H NMR spectrum. It was found that the polymer block was the strongest when the PBT ratio (XPBT) was33mol%. As the glass transition temperature (Tg) increases with the increase of XPBT, the melting point (Tm) decreases first and then increases with the increase of XPBT. The thermal decomposition temperature rises from 367.74 ℃ to 372.95 ℃. Mechanical tests show that the addition of hard segments improves the heat resistance and mechanical properties of PBS.