Diffusion of toluene and 2-methylnaphthalene, in hexane solutions, through amorphous, d e and b films of syndiotactic polystyrene (sPS) is investigated. The diffusivity for the transport of toluene (amorphous4d e -sPS4b-sPS) is inversely proportional to the crystallinity. Flux in the non-crystalline region ( N am sol ) for the amorphous and d e -sPS films are similar, and greater than for the b-sPS film, because crystallization is promoted in the amorphous film during transport measurements. Nanopores in crystalline d e -sPS act as tunnels for the transport of toluene, whereas there are no such structures for b-sPS; and thus, the toluene flux is slower. The transport of 2-methynaphthalene is much slower in comparison to toluene, which can be attributed to molecular size. The diffusivity in the amorphous film is slightly larger than that for the d e -sPS, whereas no diffusion is observed in the b-sPS film because of the presence of deformed noncrystalline chains resulting from the high crystallinity. The N am sol for the amorphous film is larger than that for the d e -sPS film, because the pores in the d e -sPS are of insufficient size for the transport of 2-methynaphthalene.
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