Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 32, Issue 13, Pages 972-976Publisher
WILEY-BLACKWELL
DOI: 10.1002/marc.201100118
Keywords
block copolymers; photosensitive materials; vesicles
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fonds Quebecois de la Recherche sur la Nature et les Technologies of Quebec (FQRNT)
- China Scholarship Council
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We demonstrate a strategy for using an optical stimulus to trigger the dissociation of block copolymer (BCP) vesicles in aqueous solution. The BCP, comprising hydrophilic poly(ethylene oxide) (PEO) and a block of poly(methacrylic acid) bearing a number of spiropyran methacrylate comonomer units (P(MAA-co-SPMA)), was allowed to firstly self-assemble into large vesicles in aqueous solution at pH = 3 with protonated carboxylic acid groups, and then become kinetically stable at pH = 8 due to the glassy vesicle membrane of P(MAA-co-SPMA). Fast dissociation of the vesicles was achieved through a cascade of events triggered by UV-induced isomerization from neutral spiropyran to charged merocyanine in the membrane.
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