【摘要】 由对苯二甲酸二甲酯(DMT)、1,6-己二醇(HDO)以及1,4-环己烷二甲醇(CHDM)和α-羟基-ω-羧基DL-低聚乳酸(OLA)在催化剂钛酸四丁酯下熔融缩聚合成了一系列可生物降解共聚酯聚(对苯二甲酸环己烷二甲醇酯-co-对苯二甲酸己二酯-co-乳酸)(PHCTL)。采用核磁共振仪(1HNMR)、差示扫描量热仪(DSC)、热重分析(TG)和广角X射线衍射(WAXS)测试技术对共聚酯进行了表征。结果表明,共聚酯的熔点(Tm),比聚(对苯二甲酸己二醇酯-co-乳酸)(PHTL)增加40～120℃,热分解温度(Td)增加20～40℃。当环己烷二甲醇在二元醇投料中占30%～70%%时,由凝胶渗透色谱(GPC)分析测得共聚酯的分子量在1.7×104～3.6×104之间。PHCTL共聚酯37℃时在磷酸缓冲液中10d后降解10%,而PHTL则为7%,PHCTL共聚酸的杨氏模量为242MPa。更多还原

【Abstract】 A new series of biodegradable copolyesters,PHCTL,were synthesized via polycondensation from dimethyl terephthalate(DMT),1,6-hexanediol(HDO),1,4-cyclohexanedimethanol(CHDM)and oligo(lactic acid)(OLA)in the presence of activator tetrabutyl titanate.The resulting copolyesters,PHCTL,were characterized by 1H NMR,differential scanning calorimetry(DSC),thermogravimetry(TG)and wide-angle X-ray scattering(WAXS).The melting temperature(Tm)and thermal decomposition temperature(Td)of the copolyesters increased obviously with increased of the CHDM content.In comparison with the copolyesters without CHDM involved,the Tm and Td of the copolyesters with a feeding ratio of 50/50 CHDM/HDO increased from 129 ℃ and 361 ℃ to 219 ℃ and 383 ℃,respectively.The molecular mass of the copolyesters varied in a range of 1.7×104~3.6×104 g/mol.The copolyesters were distinctly degraded in phosphate buffer solution at 37 ℃(10% mass loss after 10 days,7% for PHTL).The degradation rates of the copolyesters were dependent on their hydrophilicity.The Young module of PHCTL is 242 MPa.更多还原