Reversible Photocontrolled Swelling-Shrinking Behavior of Micron Vesicles Self-Assembled from Azopyridine-Containing Diblock Copolymer
Reversible Photocontrolled Swelling-Shrinking Behavior of Micron Vesicles Self-Assembled from Azopyridine-Containing Diblock Copolymer
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DOI：
10.1002/marc.200800483
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发表时间：
2008-12
影响因子：
4.6
通讯作者：
Kuo Han;Wei‐Nien Su;Min-Cheng Zhong;Qing Yan;Yanhua Luo;Qijin Zhang;Yin-mei Li
中科院分区：
文献类型：
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作者：
Kuo Han;Wei‐Nien Su;Min-Cheng Zhong;Qing Yan;Yanhua Luo;Qijin Zhang;Yin-mei Li
采用连续可逆加成-断裂链转移（RAFT）聚合法合成了聚（N-异丙基丙烯酰胺）-嵌段聚甲基丙烯酸6-[4-（4-吡啶偶氮）苯氧基]己酯（PNIPAM-b-PAzPy）。在水/四氢呋喃（H2O/THF）混合溶剂中，两亲性PNIPAM-b-PAzPy自组装成巨大的微囊泡。在交替的紫外（UV）和可见光照射下，直接在光学显微镜下观察到明显的可逆溶胀-收缩的囊泡。由UV光引起的体积的最大百分比增加达到17%。此外，可以使用UV光功率密度来调节溶胀。这种效应的产生是由于囊泡中偶氮吡啶单元的光诱导可逆异构化。
Poly(N-isopropylacrylamide)-block-poly{6-[4-(4-pyridyazo)phenoxy] hexylmethacrylate} (PNIPAM-b-PAzPy) was synthesized by successive reversible addition-fragmentation chain transfer (RAFT) polymerization. In a water/tetrahydrofuran (H 2 O/THF) mixture, amphiphilic PNIPAM-b-PAzPy self-assembles into giant micro-vesicles. Upon alternate ultraviolet (UV) and visible light irradiation, obvious reversible swelling-shrinking of the vesicles was observed directly under an optical microscope. The maximum percentage increase in volume, caused by the UV light, reached 17%. Moreover, the swelling could be adjusted using the UV light power density. The derivation of this effect is due to photoinduced reversible isomerization of azopyridine units in the vesicles.