SBS三嵌段共聚物在丁酮溶剂中的降解

DEGRADATION OF SBS TRIBLOCK COPOLYMER IN METHY- LETHYL KETONE SOLVENT

论文研究了SBS三嵌段共聚物在选择性溶剂丁酮中的降解。采用超速离心沉降速度法、毛细管粘度法、GPC和IR的研究手段,证实了SBS/丁酮溶液存放时间较长时,溶液中SBS分子发生降解,降解发生在聚丁二烯嵌段的不饱和双键。从而也表明SBS/丁酮溶液中胶束行为的不稳定归国于SBS分子的降解。

SBS molecules can micellize in methylethyl ketone (MEK) under certain conditions. But the behavior of micellization was found to be instable. In this paper, GPC,IR, ultracentrifuga-tion and viscometry were used to study the instability. It was pointed out that SBS molecules were degradated in MEK solvent when solution was stored in air for a long time. The reason is that ketone is easy to yield free radicals by ultra-violet ray and the free radicals accelerate oxidation and degradation of double bond C=C of PB block in the SBS molecules.