Journal
SOFT MATTER
Volume 8, Issue 11, Pages 3131-3138Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sm07100b
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Funding
- National Natural Science Foundation of China [51103044, 21174038, 50925308]
- Natural Science Foundation of Shanghai [10ZR1407800]
- Shanghai Municipality [11QA1401600]
- Fundamental Research Funds for the Central Universities [20100074120001, WD0914031]
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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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