LOCAL MOBILITY OF POLYMER-CHAIN GRAFTED ONTO POLYETHYLENE MONITORED BY FLUORESCENCE DEPOLARIZATION

The fluorescence depolarization method was used for investigating the local mobility of polymer chains grafted onto a porous polyethylene me mbrane. The real value of the rotational diffusion coefficient of a da nsyl probe attached to the grafted polymer chain was obtained by using a correction method which eliminated the effect of multiple scatterin g on fluorescence anisotropy, The rotational mobility of the dansyl pr obe attached to the grafted polymer chain was sensitive to both degree of grafting and solvent polarity, which indicated that the conformati on of the grafted polymer chain and the pore size of the base membrane strongly governed the dynamic parameters of the grafted polymer chain . (C) 1997 Elsevier Science B.V.