A water-soluble pH-responsive molecular brush of Poly(N,N- dimethylaminoethyl methacrylate) grafted polythiophene

Mingfeng Wang, Shan Zou, Gerald Guerin, Lei Shen, Kangqing Deng, Marcus Jones, Gilbert C. Walker, Gregory D. Scholes, Mitchell A. Winnik

Research output: Contribution to journalArticle

120 Scopus citations

Abstract

We report the synthesis of a new polythiophene (PT)-based molecular brush (PT-g-PDMA) by growing poly(N,N-dimethylaminoethyl methacrylate) (PDMA) chains from the PT backbone by ATRP. The polymer shows a reversible pH response in aqueous solution. A combination of AFM, light scattering, and 1H NMR measurements indicated that the polymer brush forms a more extended conformation with a decrease in pH from 8 to 2 due to the protonation of the Me 2N- groups and increased repulsive interactions among the PDMA side chains, which drives the red shift of the absorption and PL spectra of the PT backbone. The good solubility of this polythiophene-based brush in a wide range of solvents is attractive for the fabrication of functional polymer composites.

Original languageEnglish (US)
Pages (from-to)6993-7002
Number of pages10
JournalMacromolecules
Volume41
Issue number19
DOIs
StatePublished - Oct 14 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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    Wang, M., Zou, S., Guerin, G., Shen, L., Deng, K., Jones, M., Walker, G. C., Scholes, G. D., & Winnik, M. A. (2008). A water-soluble pH-responsive molecular brush of Poly(N,N- dimethylaminoethyl methacrylate) grafted polythiophene. Macromolecules, 41(19), 6993-7002. https://doi.org/10.1021/ma800777m