Cononsolvency in PNIPAM - effect of pressure
In aqueous solution, poly(N-isopropylacrylamide) (PNIPAM) is a responsive polymer which phase separates above a certain temperature, the cloud point. The cloud point increases with pressure up to 600 bar, then decreases. Addition of methanol alters the cloud point as well, and at high pressures, a coexistence region is encountered. We aim at investigating the chain conformation and domain structure in PNIPAM solutions, either in a mixture of water and methanol or in pure water. This will enable us to test theories about the change of chain conformation upon addition of methanol and will elucidate the effect of pressure on the hydrophobic effect and on the structure of water. SANS at D11 together with the use of deuterated solvents offers to cover a wide range of length scales, from the single chain to the domain scattering, which is of special interest in the coexistence region.
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PAPADAKIS Christine; CLAUDE Kora-Lee; KO Chia-Hsin; NIEBUUR Bart-Jan; SCHULTE Alfons; SCHWEINS Ralf and ZHANG Xiaohan. (2016). Cononsolvency in PNIPAM - effect of pressure. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1795
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