FT-IR,DSC STUDY ON THE MISCIBILITY OF STYRENE-BUTADIENE- STYRENE TRIBLOCK COPOLYMER (SBS)/POLY (VINYL METHYL ETHER) (PVME) BLENDS
苯乙烯-丁二烯-苯乙烯/聚乙烯基甲基醚共混体系相容性的FT-IR及DSC研究

Miscibility of blends of styrene-butadiene-styrene triblock copolymers SBS-48,SBS-30, SBS-28 and poly (vinyl methyl ethyl ether) (PVME) were investigated by clarity ,DSC and FT-IR. From optical clarity and DSC results, the higher the styrene content in SBS and the higher the molecule weight of PS segment were, the better the miscibility of the blends was . From FT-IR results, the relative peak intensity of the 1100 cm-1 region due to COCH3 bond of PVME was sensitive to the miscibility of SBS/PVME, while the peak position of 698 cm-1 region due to C-H out-of-plane bending vibration of phenyl ring in PS was not as sensitive as that in PS/PVME. It can be concluded that the miscibility in SBS/PVME blends is greatly affected by the composition of the block copolymers in blends and the composition of styrene in the copolymers. Molecule weight of PS segment in SBS is also important.