Grafting of acrylamide to nylon‐6 by the electron‐beam preirradiation technique. II. Kinetic aspects and film permeability

Abstract

SynopsisSingle-and multilayered laminated nylon-6 films were grafted with acrylamide (AM) using the electron-beam preirradiation technique. Very high grafting yields were obtained within short time periods. Grafting onto single films was shown to proceed via "diffusion free" pseudo zero-order kinetics. Grafting onto multilayered films was diffusion controlled. SEM and EDAX measurements indicate uniform grafting of single-film membranes and asymmetric grafting of membranes prepared by grafting onto multilayered films. The permeability of grafted membranes to a number of permeants was found to increase with extent of grafting. The specific permeability to both water and solutes exceeded that of the dialysis grade cellophane at 5 m o graft. The selectivity of grafted films towards various solutes had also been found to be higher than that of cellophane.

In situ electron spin resonance study of styrene grafting of electron irradiated fluoropolymer films for fuel cell membranes

“…Graft polymerization proceeds, both, in the amorphous regions and at the surface of crystallites 27, 28. Radicals in the amorphous regions above the glass temperature are more accessible but have shorter lifetimes than radicals in crystalline regions.…”