Synthesis of a Linear-Hyperbranched Supramolecular Polymer and Its Light-Responsive Self-Assembly Behavior

doi:10.6023/A16020076

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (5): 415-421.DOI: 10.6023/A16020076 Previous Articles Next Articles

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“线性-超支化”超分子聚合物的制备及光响应性自组装行为研究 2017 Awarded

李惠梅, 王洁, 倪云洲, 周永丰, 颜德岳

上海交通大学化学化工学院上海 200240

投稿日期:2016-02-01 发布日期:2016-03-22
通讯作者: 周永丰 E-mail:yfzhou@sjtu.edu.cn
基金资助:
项目受国家重点基础研究发展计划(973计划, No. 2013CB834506)、国家杰出青年基金(No. 21225420)和国家自然科学基金(Nos. 21474062, 91527304)资助.

Synthesis of a Linear-Hyperbranched Supramolecular Polymer and Its Light-Responsive Self-Assembly Behavior

Li Huimei, Wang Jie, Ni Yunzhou, Zhou Yongfeng, Yan Deyue

College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240

Received:2016-02-01 Published:2016-03-22
Supported by:
Project supported by the National Basic Research Program (No. 2013CB834506), the China National Funds for Distinguished Young Scholar (No. 21225420), the National Natural Science Foundation of China (Nos. 21474062, 91527304).

1. Synthesis of a Linear-Hyperbranched Supramolecular Polymer and Its Light-Responsive Self-Assembly Behavior.PDF(428KB)

Abstract

Herein we reported the synthesis, self-assembly and light-responsive disassembly of a “linear-hyperbranched” supramolecular polymer. Firstly, a hyperbranched polymer CD-g-HPG composed of hyperbranched polyglycerol with a β-cyclodextrin group in the center was synthesized by ring-opening multibranching polymerization (ROMBP). Secondly, a linear polymer AZO-PS composed of polystyrene with an azobenzene group at the end was synthesized via atom transfer radical polymerization (ATRP). Then, the linear AZO-PS and hyperbranched CD-g-HPG were conjugated together through the specific CD/AZO host-guest interactions, leading to the formation of the “linear-hyperbranched” supramolecular polymer PS-b-HPG. This supramolecular polymer was amphiphilic and could self-assemble into vesicles in water. The host-guest complexation ability was characterized by UV-Vis titration. In the case of keeping the concentration of AZO-PSs unchanged, the absorption peak at 330 nm increased gradually with the addition of CD-g-HPGs, which supported the occurrence of complexation between β-CD groups in CD-g-HPGs and AZO groups in AZO-PSs. The host-guest CD/AZO complexation constant of 4.14×10⁴ M^-¹ was calculated by the Benesi-Hildebrand plot. A Job plot was generated, from which it was determined that the binding stoichiometry between AZO-PS and CD-g-HPG is 1:1. The self-assemblies of the amphiphlic linear-hyperbranched supramolecular polymers were characterized by SEM and TEM. The SEM images showed that the self-assemblies were spherical particles, and the holes directly be seen in some particles indicated that they were vesicles or hollow spheres with a very thin wall thickness. The TEM images of self-assemblies stained with ruthenium tetroxide (RuO₄) indicated that the spherical particles were vesicles according to a clear contrast difference between the inner pool and the outer thin wall. At last, we showed that the vesicles could disassemble under UV light due to the trans-to-cis isomerisation of the AZO groups. With the continuous UV irradiation on vesicles, the absorption peak of trans-AZO diminished gradually and almost completely disappeared after 900 seconds. Meanwhile, the solution was transformed from turbid to transparent followed with the appearance of yellow precipitates in the bottom of the bottle.

Key words: supramolecular polymers, linear-hyperbranched, host-guest interactions, self-assembly, light responsive

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Li Huimei, Wang Jie, Ni Yunzhou, Zhou Yongfeng, Yan Deyue. Synthesis of a Linear-Hyperbranched Supramolecular Polymer and Its Light-Responsive Self-Assembly Behavior[J]. Acta Chim. Sinica, 2016, 74(5): 415-421.

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“线性-超支化”超分子聚合物的制备及光响应性自组装行为研究 2017 Awarded

Synthesis of a Linear-Hyperbranched Supramolecular Polymer and Its Light-Responsive Self-Assembly Behavior

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