苯胺四聚体-PEG两亲性嵌段共聚物的合成、表征及自组装行为  

Synthesis,Characterization and Self-Assembly of PEG-Aniline Tetramer Block Copolymer

作　　者：郎乐[1,2] 庄秀丽[1] 刘亚栋[1,2] 章培标[1] 陈学思[1] 危岩[3] 

机构地区：[1]中国科学院长春应用化学研究所,生态环境高分子材料重点实验室,长春130022 [2]中国科学院研究生院,北京100039 [3]爵硕大学化学系,PA19104,美国

出　　处：《高等学校化学学报》2011年第2期411-415,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50773081,50733003,50425309);国家“八六三”计划项目(批准号:2007AA03Z320)资助

摘　　要：以二环己基碳二亚胺(DCC)为缩合剂,使聚乙二醇单甲基醚(mPEG)与苯胺四聚体(AT)反应,得到两嵌段共聚物.用核磁共振(1H NMR)和红外光谱(FTIR)方法确认了共聚物的结构,紫外-可见光谱(UV-Vis)及循环伏安(CV)的测试结果表明,该共聚物具有良好的电活性特征.用扫描电镜与光散射的方法对粒径大小进行了测量,共聚物在水溶液中可形成直径125 nm的均匀球形组装体,通过透射电镜确定了组装体的实心结构.当嵌段共聚物处于中间氧化态时,组装体的尺寸会随着溶液pH值的变化而变化.对组装体的形成及pH敏感性的可能机理进行了讨论.An electroactive block copolymer consisting of methoxy poly（ethylene glycol）（mPEG） and aniline tetramer（AT）,mPEG-AT,was synthesized via condensation in the presence of N,N′-dicyclohexylcarbo-{diimide（DCC）.} The chemical structure of the copolymer was confirmed by 1H NMR and FTIR.UV-Vis and {cyclic} voltammogram methods were used to evaluate the electroactivity of the block copolymer.The particle size was measured by ESEM and DSL methods.The spherical aggregates with diameter of about 125 nm were {observed} by self-assembly method when the copolymer was dissolved in water.The diameter of spherical {aggregates} would alter as the variation of aqueous pH when the AT segment was oxidized to its emeraldine form.The possible mechanism of self-assembly of the block copolymer and the pH-sensitivity were discussed.

关 键 词：苯胺四聚体 聚乙二醇 嵌段聚合物 电活性 自组装 

分 类 号：O631[理学—高分子化学]