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    Collapse and Swelling of Poly(N-isopropylacrylamideco-co-sodium acrylate) Copolymer Brushes Grafted on a Flat SiO2 Surface

    Year: 2006

    Journal: Journal of Polymer Science: Part B: Polymer Physics, Vol. 44, 770–778 (2006), 20100827

    Authors: Cheng H. 1, Liu G. 1, Wanf C. 1, Zhang G. 1, Wui C. 2

    Last authors: CHI WU

    Organizations: 1National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, China 2Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China

    Country: China

    Poly(N-isopropylacrylamide-co-sodium acrylate) copolymer brushes grafted on SiO2-coated quartz crystal surface were prepared with a surface-immobilized initiator. The collapse and swelling of the thermally sensitive copolymer brushes in water were studied with quartz crystal microbalance in situ. The frequency and dissipation changes with the temperature increasing in the range 20–38 8C indicate that the brushes undergo a continuous collapse transition. Our results show that the copolymer brushes collapse to a state where the brushes were prepared. A hysteresis was observed in the cooling process. Fourier transform infrared (FTIR) results revealed that the formation of some additional hydrogen bonds within the copolymer chains at their collapsed state is responsible for the hysteresis.