偶氮苯
共聚物
小泡
材料科学
透射电子显微镜
动态光散射
聚苯乙烯
聚合物
高分子化学
环氧乙烷
自组装
扫描电子显微镜
化学工程
化学
膜
纳米技术
纳米颗粒
复合材料
工程类
生物化学
作者
Yingying Wang,Shaoliang Lin,Minghui Zang,Yaohui Xing,Xiaohua He,Jiaping Lin,Tao Chen
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:8 (11): 3131-3131
被引量:53
摘要
The self-assembly behavior and photo-responsive properties of novel azobenzene based copolymers poly(ethylene oxide) monomethyl ether-block-polystyrene-block-{poly[6-(4-methoxy-azobenzene-4′-oxy) hexylmethacrylate]}2 [MPEO-b-PS-b-(PMMAZO)2] with various block lengths of PMMAZO segments in aqueous media were studied by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), laser light scattering (LLS) and UV-Vis spectrophotometry. It was found that the critical water content for the aggregate formation increases with the PMMAZO weight fraction. By tailoring the molecular structure and copolymer concentration, various self-assembled aggregates were obtained. At a lower concentration, all the copolymers self-assembled into simple vesicles. With increasing the polymer concentration, large compound vesicles were formed. The photo-sensitive properties of the formed aggregates were also studied. Upon irradiation with a polarized light, the aggregates were elongated. Large compound vesicles were found to deform into compact spindles with a very large axial ratio.
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