The excimer fluorescence of a triblock copolymer, styrene-butadiene-styrene (SBS) containing 48 wt% polystyrene was used to investigate its miscibility with poly(vinyl methyl ether) (PVME). The excimer-tomonomer emission intensity ratio I~I E can be used as a sensitive probe to determine the miscibility level in SBS/PVME blends: lr.t/lr~ is a function of PVME concentration, and reaches a maximum when the blend contains 60% PVME. The cloud point curve determined by light scattering shows a pseudo upper critical solution temperature diagram, which can be attributed to the effect of PB segments in SBS. The thermally induced phase separation of SBS/PVME blends can be observed by measuring lrJIE, and the phase dissolution process was followed by measuring I~I,~ at different times.
Посилання на статтю:
Excimer fluorescence study on the miscibility of poly(vinyl methyl ether) and styrene-butadiene-styrene triblock copolymer / Rui Xie*, Bingxin Yang and Bingzheng Jiang // Polymer. – 1993. – Vol 34. – P. 5016-5019.