期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 36, 期 14, 页码 1341-1347出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201500136
关键词
amphiphilic macrocycles; azobenzene; photoresponsive polymers; self-assembly
资金
- National Science Foundation of China [21234005]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Program of Innovative Research Team of Soochow University
Herein, the first example of photosensitive cyclic amphiphilic homopolymers consisting of multiple biphenyl azobenzene chromophores in the cyclic main chain tethered with hydrophilic tetraethylene glycol monomethyl ether units is presented. The synthetic approach involves sequentially performed thermal catalyzed click step-growth polymerization in bulk, and Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) intramolecular cyclization from -alkyne/-azide linear precursors. It is observed that such amphiphilic macrocycles exhibit increased glass transition temperatures (T-g), slightly faster trans-cis-trans photoisomerization, and enhanced fluorescence emission intensity compared with the corresponding linear polymers. In addition, the cyclic amphiphilic homopolymers self-assemble into spherical nanoparticles with smaller sizes which possess slower photoresponsive behaviors in a tetrahydrofuran/water mixture compared with those of the linear ones. All these interesting observations suggest that the cyclic topology has a great influence on the physical properties and self-assembly behavior of these photoresponsive amphiphilic macrocycles in general.
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