偶氮苯三嵌段共聚物的合成、自组装及响应性研究
首发时间:2014-07-21
摘要:本文利用原子转移自由基聚合的方法合成了新型三嵌段共聚物聚(氧化乙烯)甲基醚-b-聚丙烯酸-b-聚[6-(4-甲氧基偶氮苯-4'-氧基)己基甲基丙烯酸],通过透射电子显微镜、扫描电子显微镜、激光光散射和紫外-可见光光谱研究了该共聚物在水中的自组装行为及其pH值和光响应性。研究发现该共聚物可自组装形成囊泡。在pH值小于3.4时,胶束粒径随着pH值的减小而急剧增大;pH大于3.4时,粒径无明显变化。在偏振光的照射下,聚集体会随着照射时间的延长而拉长。
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Study on the synthesis, self-assembly and responsive behavior of triblock copolymers containing azobenzene moieties
Abstract:In this work, a new triblock copolymer poly(ethylene oxide) monomethyl ether-b-poly(acrylic aid)-b-poly[6-4-methoxy-azobenzene-4'-oxy) hexyl methylacrylate] was synthesized by the atom transfer radical polymerization (ATRP) method. The self-assembly behaviors in aqueous media, pH sensitive and photo-sensitive properties of this copolymer were studied by the means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), laser light scattering (LLS) and UV-Vis spectrophotometer. It is found that the polymer can self-assemble into vesicle structure. With decreasing the pH value, the particle size of the aggregates increases sharply obviously bigger when pH < 3.4. However, there is not significant change for the particle size of micelles when pH > 3.4. Upon irradiation with polarized light, the aggregates are elongated with increasing the irradiation time.
Keywords: self-assembly photo-responsive pH-responsive azobenzene
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No.4604242222691405****
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