PAn-PEG-PAn三嵌段共聚物的合成和表征  

The Preparation and Characterization of PAn-PEG-PAn Rod-coil Triblock Copolymers

作　　者：马会茹[1] 官建国[1] 卢国军[1] 袁润章[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《物理化学学报》2005年第6期627-631,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(29904005);教育部优秀青年教师(2002[350])基金资助项目~~

摘　　要：在合成α,ω-双(对氨基苯基)聚乙二醇(BAPPEG)的基础上,用化学氧化共聚法制备了PAn-PEG-PAn三嵌段共聚物.研究了共聚时苯胺(An)与BAPPEG摩尔比(r)对共聚物的化学组成、UV-Vis谱图、热稳定性和在水溶液中的自组装特性的影响.结果表明:随着r的增加,共聚物中PAn链段的含量增大;其UV-Vis谱图中对应PAn链段的吸收峰出现红移,且红移的程度增加;热稳定性提高.三嵌段共聚物在水中表现出自组装特性:随着r的增加,先形成粒径约为90nm的PAn链段/PEG链段球型核壳胶束,然后形成长为400～800nm,直径约为30nm的棒状结构,和棒状结构聚集形成的网状结构,最后又变成球型胶束.PAn-PEG-PAn rod-coil triblock copolymers were prepared by chemical oxidation copolymerization of aniline and alpha, omega-bis(p-aminophenyl) poly(ethylene glycol)( BAPPEG) and were characterized by IR, elemental analysis, UV-Vis absorption spectroscopy, thermogravimetric analysis and TEM. The results showed that with increasing the molar ratio of feed An to feed BAPPEG(r), the PAn segment length in the copolymer increased, which was indicated by the red shift of the UV-Vis characteristic absorption peak corresponding to the PAn segment, and the thermal stabilities were enhanced. The rod-coil-rod triblock copolymers in water self-assembled into such different nano-structures as core-shell micelles, rods or rods-based net structures, depending on the PAn segment length.

关 键 词：聚苯胺 聚乙二醇 嵌段共聚物  自组装 

分 类 号：O631[理学—高分子化学]