SYNTHESIS AND CHARACTERIZATION OF POLY(STYRENE - ETHYLENE OXIDE) DIBLOCK COPOLYMERS

Well - defined diblock copolymers Of styrene (St ) and ethylene oxide (EO )have been prepared by sequential living anionic polymerization of the twocomonomers in THF. Diphenyl methyl potassium has been used as initiator. Theblock copolymers were characterized in detail by methods Of size exclusion chromatography (SEC ) , 1H - Nab, FT - IR, dynamic mechanical analysis(Daal ) and WAXD.

低温水工沥青的研制

以90#普通沥青为原料,苯乙烯-丁二烯嵌段共聚物(SBS)为改性剂,橡胶类复合改性剂为添加剂,调和油为软化剂,在后三者加入质量分数依次为6%,6%,40%的条件下,制备出低温水工沥青,并对工业试生产的低温水工沥青及其混凝土性能进行了评价。结果表明:试生产的低温水工沥青具有良好的耐高低温性能,产品性质稳定,脆点达到-28℃,延度(5℃)达到84 cm以上,薄膜烘箱实验后脆点略有上升;低温水工沥青混凝土孔隙率、斜坡流淌值等均满足DL/T 5411—2009要求,其拉伸应变(0℃)和弯曲应变(0℃)高于基质沥青混凝土。