Co-solvent dependent swelling and switching kinetics of PMMA-b-PNIPAM thin films
It is known that the collapse transition temperature can be tuned by introducing co-solvents into aqueous solutions due to the competitive attachment and detachment of water and co-solvent to the PNIPAM chain. In the present study we increase the complexity by studing block copolymer films. We want to monitor the development of thickness and refractive index whilst investigating morphological changes and the kinetics of individual solvent and co-solvent diffusion into PMMA-b-PNIPAM films. We intend to compare the co-solvents acetone and dimethyl sulfoxide. Both are aprotic yet miscible with water across the whole solvent-co-solvent binary. Moreover, both are available as deuterated derivatives, have suitable vapor pressure and cause a co-nonsolvency based decrease of the LCST at low molar fraction.
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MUELLER BUSCHBAUM Peter; CUBITT Robert; Christina Geiger; Lucas Philipp Kreuzer; WANG Peixi and Tobias Widmann. (2019). Co-solvent dependent swelling and switching kinetics of PMMA-b-PNIPAM thin films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1928
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