pvdf layer a thickness 500 u03bcm bonded to a layer b of a blend of i 50 by weight of lotadere 8840 thickness 100 u03bcm which is an ethylene glycidyl methacrylate copolymer of 5 g 10 min mfi at 190 u00b0 c 2 16 kg containing 92 ethylene and 8 glycidyl methacrylate by weight and ii 50 of stamylex u00ae 1016 f polyethylene which was itself bonded to a layer c consisting of ms201n high density pe thickness 500 u03bcm at t 0 an adhesive strength of 30 n cm was measured at the a b interface and the b c interface could not be peeled the structure was immersed in m15 fuel at 60 u00b0 c after 15 days the structure showed no delamination and a force of 15 n cm was measured at the a b interface after the a b c structure was vacuum dried for one week at 60 u00b0 c the peel force between a and b was again measured namely 30 n cm a powder blend consisting of kynar 720 pvdf 2000 g with maleic anhydride 20 g was prepared the blending was carried out in a turbolator for 10 minutes the blend was put into a sealed bag the bag was sealed taking care to expel as much air as possible from the bag the sealing of the bag was checked as neither air nor dust must be able to escape from the bag the latter underwent beta irradiation to 6 mrad 10 mev beta the powder infrared analysed after heating in an oven overnight at 130 u00b0 c had a.