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18-20) have worked with copolymers of poly(acrylic acid) as soluble backbone with poly(ethylene oxide) (PEO) grafts N-isopropylacrylamide (NIPAM) they found that, for the two systems when the cloud point [lower critical solution temperature (LCST)] was reached phase separation was observed that it was maintained at the microscopic level due to the water-soluble backbone, causing an increase in the viscosity of the solution.
The responsive polymer gel consists mainly of linked N-isopropylacrylamide molecules.
The PNIPA/silica composite hydrogels were synthesized by using N-isopropylacrylamide (NIPA) and the modified silica as comonomers, and the effects of the silica incorporation on the swelling and deswelling behaviors, CGTT, breaking stress, and other properties of the PNIPA hydrogels were investigated.