DIFFUSION OF ORGANIC COMPOUNDS IN SATURATED POLYOLEFINS

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 D0 = - 14·8 + 0·43 Ed/T is obtained for the diffusion in saturated polyolefins using these and other published data. © 1968.