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采用烷基碱金属化合物为引发剂,在饱和烃类溶剂中合成丁二烯-苯乙烯无规共聚物的技术,在国外已得到工业化应用。但这种溶聚丁苯在常温下易产生塑性变形,冷流倾向较为突出。通过在无规丁苯大分子活性链端联接聚苯乙烯刚性嵌段的方法,可以有效地改善溶聚丁苯的冷流性能。美国Phillips公司于1968年曾对正丁基锂/四氢呋喃引发体系溶聚丁苯共聚物引入末端嵌段以改善冷流性能的结果进行过报道。本研究以正丁基锂(n-BuLi)为引发剂,环己烷为溶剂,添加叔丁基氧钾(t-BuOK)或四氢呋喃(THF),采用分步加料的方
The technology of synthesizing butadiene-styrene random copolymer in saturated hydrocarbon solvent by using alkyl alkali metal compound as initiator has been industrially applied abroad. However, this solution-polybutylbenzene is easy to produce plastic deformation at room temperature, cold flow tendency is more prominent. The cold flow performance of the polybutylbenzene can be effectively improved by the method of linking the polystyrene rigid blocks to the end of the active butyl benzene macromolecule. Phillips company in the United States in 1968 had n-butyl lithium / tetrahydrofuran initiator system dissolved polybutylbenzene copolymer introduced into the terminal block to improve the cold flow performance results were reported. In this study, n-BuLi as initiator and cyclohexane as solvent were added t-BuOK or THF,