A Water-Soluble pH-Responsive Molecular Brush of Poly( N , N -dimethylaminoethyl methacrylate) Grafted Polythiophene
2008; American Chemical Society; Volume: 41; Issue: 19 Linguagem: Inglês
10.1021/ma800777m
ISSN1520-5835
AutoresMingfeng Wang, Shan Zou, Gérald Guérin, Lei Shen, Kangqing Deng, Marcus Jones, Gilbert C. Walker, Gregory D. Scholes, Mitchell A. Winnik,
Tópico(s)Luminescence and Fluorescent Materials
ResumoWe 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 Me2N− 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.
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