The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have ...The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have a broader range in thickness change with a decrease in solvent quality due to the interchain interaction in spherical geometry.With the increasing of the molecule weight of the PNIPAM,the phase transition of grafted chain change from single transition to two stage transition.At T = 250C,the <L>shell can be scale to N as <L>shell∝N0.9±0.1.With increasing of the temperature,the exponential of scaling law of <L>shell and N decrease a little.However,the PNIPAM chains still expand with <L>shell ∝N0.76±0.10 due to the high grafted chain density.展开更多
文摘The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have a broader range in thickness change with a decrease in solvent quality due to the interchain interaction in spherical geometry.With the increasing of the molecule weight of the PNIPAM,the phase transition of grafted chain change from single transition to two stage transition.At T = 250C,the <L>shell can be scale to N as <L>shell∝N0.9±0.1.With increasing of the temperature,the exponential of scaling law of <L>shell and N decrease a little.However,the PNIPAM chains still expand with <L>shell ∝N0.76±0.10 due to the high grafted chain density.