Researches on the preparation of several polytetrafluroethylene(PTFE) functional fibers and N-isopropylacrylamide (NIPA) grafted chitosan via the radiation grafting have been described which were developed in the authors’laboratory in recent years .It is found that the radiation grafted functional materials have special properties.（1） The acrylic acid grafted PTFE fiber showed stronger acidity than the carboxylic acid grafted one

of which the carboxylic content was 3.07 mmol/g determined by the titration experiments.It showed excellent adsorption

desorption and separation properties for Cu2+

Pb2+ and La3+.The highest adsorption capacity for Cu2+

Pb2+and La3+was 107.48

246.41

150.20 mg/g respectively

when pH was 5.（2） Hammett superacid indicators were used to estimate the superacidity of PTFE-g-ST-SO3H fibers with different degree of grafting.The results showed that the acidity of PTFE-g-St-SO3H fiber was stronger than 100% H2SO4 when the grafting degree was 21.7%.The relative catalytic activity of PTFE-St-SO3H fiber as a polymer superacid catalyst was higher than that of macroporous sulphonated resin in esterification

and it can be used repeatedly.（3） The NIPA grafted chitosan showed good thermo and pH activity

it had the potential use in drug releasing and other areas.