Diffusion of orǵanic compounds in saturated polyolefins

Abstract The diffusion of 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4- n -butoxybenzophenone, 2-hydroxy-4- n -octoxybenzophenone, 2-hydroxy-4- n -dodecoxybenzophenone, 2-hydroxy-4- n -octadecoxybenzophenone has been studied. The polymers examined were: stereoblock, polypropylene (between 70° and 85°) high density polyethylene (between 80° and 110°), low density polyethylene (between 70° and 90°). Also the diffusion of dimethyl-3, 3′-thiodipropanoate and di- n -hexyl-3, 3′ thiodipropanoate in low crystalline polypropylene was studied between 20° and 40°. The diffusion coefficients are reported. The effect of mutual compatibility between penetrant and polymer upon the diffusion process is discussed. The linear relation ln D 0 = − 14·8 + 0·43 E d/ T is obtained for the diffusion in saturated polyolefins using these and other published data.