Abstract: Crystallization and orientation behavior of syndiotactic polystyrene(sPS) were investigated by polarized micro-FTIR. Surface of anodized aluminum oxide(AAO) templates was modified via a vapor phase reaction using n-hexyltrimethoxylsilane to yield an n-alkane template surface, and effect of template surface property on crystal orientation of sPS in the nanopores of various diameters was studied. After isothermally crystallized at 255 ℃, sPS chains in the crystals adopted a perpendicular orientation with respect to the pore direction of the nanopores. The degree of orientation was found to decrease with the pore diameter, and was lower in the modified nanopores than in the pristine ones of the same pore diameter. This could be attributed to the surface induced nucleation, the orientation of which affected by interactions between sPS chains and the pore surface of different properties.

Key words: nanopores, surface property, crystallization, orientation