Cononsolvency Phenomena of Poly(N-Isopropylacrylamide) in Mixed Solvents at Different Temperatures
N-isopropylacrylamide was synthesized in a mixture of DMF and THF ( 7:3 in volume ratio) and characterized by FT-IR. The behavior of poly(N-isopropylacrylamide) chain was studied by spectrometer in mixtures of water with DMF and THF. Cononsolvency phenomena were found to be temperature-dependent, as demixing occurred upon increasing temperature. A significant shrinkage of polymer chains and deswelling of polymer gels, followed by phase separation, were observed for high water fractions.
Xiaoming Qian and Huawu Liu
X. X. Qiu et al., "Cononsolvency Phenomena of Poly(N-Isopropylacrylamide) in Mixed Solvents at Different Temperatures", Advanced Materials Research, Vols. 332-334, pp. 1752-1755, 2011