摘要
以己内酯为单体,以辛酸亚锡为催化剂,开环聚合合成了可生物降解材料聚ε-己内酯(PCL)。探讨了反应过程中包括催化剂用量、聚合温度、聚合时间等因素对产物相对分子量的影响。结果表明:以辛酸亚锡为催化剂,单体:催化剂比(n(M):n(I))=1000:1,在140℃聚合24h,可获得数均分子量为3.2×104的聚ε-己内酯(PCL)。采用核磁共振谱、红外光谱等测试方法研究聚合产物的结构,并应用热分析技术研究了PCL在氮气气氛中的热行为;并对其非等温TG数据用积分法(Flynn-Wall-Ozawa法)进行了解析。根据TG曲线计算得到了PCL热分解活化能为190.0kJ/mol。
A biodegradable poly（ε-caprolactone）（PCL） was synthesized by the ring-opening polymerization of ε-caprolactone（CL） with stannous octoate as catalyst.The effects of the amount of catalyst,polymerization temperature and polymerization time on the molecular weight of PCL were investigated.The results indicated that PCL with the molecular weight of 3.2×104 could be obtained under 140 ℃ for 24 h and n（CL）：n（I）=1000：1.The structure of PCL was characterized by FTIR and 1H-NMR.The thermal behavior of PCL in N2 atmosphere was studied by TGA.The data were processed by an integral（Flynn-Wall-Ozawa） method.From the Flynn-Wall-Ozawa method,the result showed that the activation energy of PCL was 190.0 kJ/mol.
基金
高等学校博士学科点专项科研基金(20060217012)
关键词
生物材料
聚Ε-己内酯
开环聚合
分解
biomaterial
PCL
ring-opening polymerization
decomposition
