Glycidyl methacrylate(GMA) is grafted on to Polyvinylidene fluoride(PVDF) powder by pre-irradiation method.Results show that the degree of grafting(Dg) increases with absorbing dose.With the increment of reaction time

Dg increases and almost keeps unchanged after 5 h.Dg increases at first until the monomer concentration reached 15%

and then decreases.When the temperature is higher than 30°C

Dg increases quickly and reaches the maximum at 50°C.A kind of amine-type absorbents has been prepared by further chemical modification of PVDF-g-PGMA.The grafted powder is a PVDF-g-PGMA copolymer

as confirmed by FTIR characterization.DSC analysis shows that the melting point and melting enthalpy decreases with the increment of Dg.