Hiroyuki Kojima, Fumihiko Tanaka, Christine Scherzinger and Walter Richtering Temperature dependent phase behavior of PNIPAM microgels in mixed water/methanol solvents Journal of Polymer Science Part B: Polymer Physics 51
The molecular mechanism of cononsolvency has been studied for linear polymers and macrogels, but there have been only a few studies on microgels. Temperature dependent swelling behavior of poly(N-isopropylacylamide) (PNIPAM) microgels in water/methanol mixtures was studied with DLS and SANS, and the data were theoretically analyzed under the assumption of competitive hydrogen bonds. Around the transition temperature, the methanol composition in the vicinity of the polymer chains is slightly higher than that of the outer solution while the whole methanol composition inside the gel is slightly lower.
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