Bidimensional Response Maps of Adaptive Thermo- and pH-Responsive Polymer Brushes
(2010) Macromolecules — Vol. 43, n° 18, p. 7744-7751 (2010)
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- Abstract
- We depict the collapse transition of adaptive thermo- and pH-responsive copolymer brushes based on poly(di(ethylene glycol) methyl ether methacrylate-co-methacrylic acid) random copolymer chains (P(MEO(2)MA-co-MAA)) by drawing bidimensional (2D) maps of the swelling ratio versus temperature and pH for different brush compositions. The collapse transition is probed by quartz crystal microbalance measurements with dissipation monitoring (QCM-D). While P(MEO(2)MA) brushes exhibit a thermo-collapse transition around 22 degrees C and P(MAA) brushes display a pH-induced collapse transition at pH = 5.5, P(MEO(2)MA-co-MAA) brushes undergo a collapse transition modulated by either temperature or pH from a swollen state at low temperature and high pH to a collapsed state at high temperature and low pH. By varying the composition of the copolymer in MAA units from 4 to 14 mol %, the brushes switch from a pH-modulated thermo-responsive behavior to a temperature-modulated pH-responsive behavior in water. The 2D maps of swelling ratio also illustrate the complex interplay between pH and temperature, and provide a unique view of the response of adaptive brushes.
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Citations
Laloyaux, X., Mathy, B., Nysten, B., & Jonas, A. (2010). Bidimensional Response Maps of Adaptive Thermo- and pH-Responsive Polymer Brushes. Macromolecules, 43(18), 7744-7751. https://doi.org/10.1021/ma1009484 (Original work published 2010)