UV light and temperature responsive supramolecular ABA triblock copolymers via reversible cyclodextrin complexation

Schmidt, B. V.K.J. , Hetzer, M., Ritter, H. and Barner-Kowollik, C. (2013) UV light and temperature responsive supramolecular ABA triblock copolymers via reversible cyclodextrin complexation. Macromolecules, 46(3), pp. 1054-1065. (doi:10.1021/ma302386w)

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Abstract

A novel triblock macromolecular architecture based on cyclodextrin (CD) complexation is presented. A CD-functionalized biocompatible poly(N-(2-hydroxypropyl)methacrylamide) (PHPMA) building block (3800 ≤ Mn ≤ 10 600 g mol–1; 1.29 ≤ ĐM ≤ 1.46) and doubly guest-containing poly(N,N-dimethylacrylamide) (PDMAAm) (6400 ≤ Mn ≤ 15 700 g mol–1; 1.06 ≤ ĐM ≤ 1.15) and poly(N,N-diethylacrylamide) (PDEAAm) (5400 ≤ Mn ≤ 12 100 g mol–1; 1.11 ≤ ĐM ≤ 1.33) segments were prepared via reversible addition–fragmentation chain transfer (RAFT) polymerization and subsequently utilized for the formation of a well-defined supramolecular ABA triblock copolymer. The block formation was evidenced via dynamic light scattering (DLS), nuclear Overhauser effect spectroscopy (NOESY), and turbidity measurements. Furthermore, the connection of the blocks was proven to be temperature responsive and—in the case of azobenzene guests—responsive to the irradiation with UV light. The application of these stimuli leads to the disassembly of the triblock copolymer, which was shown to be reversible. In the case of PDEAAm containing triblock copolymers, the temperature-induced aggregation was investigated as well.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Schmidt, Dr Bernhard
Authors: Schmidt, B. V.K.J., Hetzer, M., Ritter, H., and Barner-Kowollik, C.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Macromolecules
Publisher:American Chemical Society
ISSN:0024-9297
ISSN (Online):1520-5835
Published Online:01 February 2013

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