采用熔融缩聚方法合成了3,4-二羟基肉桂酸(DHCA,咖啡酸)、石胆酸(LCA)和聚乙二醇(PEG)的三元类嵌段共聚物P(DHCA-co-LCA)-b-PEG,用傅里叶红外变换(FTIR)光谱、核磁共振氢谱(1H-NMR)和凝胶渗透色谱(GPC)对该聚酯的结构与分子量进行分析.所合成的聚酯结构,其分子量在2.0×104左右;差示扫描量热(DSC)、紫外光谱(UV)和荧光光谱对聚酯的热和光学性能,随着PEG投料量的增加,聚酯的玻璃化转变温度逐渐降低,荧光发射强度逐渐降低,在λ>310和254nm紫外光照射下可发生光交联和解交联反应,说明该聚酯具备一定的光可逆特性;该聚酯在选择性溶剂中可自组装形成表面光滑的球形胶束,平均直径约378nm,对不同波长的紫外光同样具有一定的响应性.
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