4.4 Article

Photoresponsive Glycopolymer Aggregates as Controlled Release Systems

Journal

MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 215, Issue 23, Pages 2365-2373

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201400365

Keywords

aggregates; ATRP; azobenzene; block copolymers; isomerization

Funding

  1. Council of Scientific and Industrial Research Task Force Program [NWP 23]
  2. UGC, Government of India

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The use of a new block copolymer made up of poly(azobenzene methacrylate) (PMAzo) and poly(3-O-4-vinylbenzoyl-D-glucopyranose) (PBG) is described for the solubilization of water-insoluble dyes such as Nile Red in aqueous solutions. This polymer, which is abbreviated as PMAzo-b-PBG, self-assembles into spherical aggregates in water as confirmed by atomic force microscopy. UV irradiation of the aqueous polymer solution destabilizes the aggregates brought about as a result of the trans-cis isomerization of the MAzo units. Dissociated aggregates reunite to form tubular aggregates when the solution is irradiated with 450 nm light. Nile Red, which is a hydrophobic dye, can be incorporated into these aggregates and subsequently released using UV light. The encapsulation, release, and re-encapsulation of Nile Red are studied using fluorescence spectroscopy.

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