Herein, we demonstrate the synthesis of a well-defined diblock copolymer consisting of isotactic polystyrene （iPS） and linear polyethylene, isotactic polystyrene-block-polyethylene （iPS-b-PE）, by the combination o...Herein, we demonstrate the synthesis of a well-defined diblock copolymer consisting of isotactic polystyrene （iPS） and linear polyethylene, isotactic polystyrene-block-polyethylene （iPS-b-PE）, by the combination of sequential monomer addition and hydrogenation. Isospecific living polymerization of styrene and living trans-1,4-polymerization of 1,3-butadiene were catalyzed by 1,4-dithiabutandiyl-2,2＇-bis（6-cumenyl-4-methylphenoxy） titanium dichloride （complex 1） activated by triisobutyl aluminum modified methylaluminoxane （MMAO） at room tempera^xre to provide highly isotactic polystyrene （iPS） and 1,4-trans-polybutadiene （1,4-trans-PBD） with narrow molecular weight distribution. Furthermore, the iPS-b-I,4- trans-PBD was synthesized via sequential monomer addition in the presence of complex 1 and MMAO. The hydrogenation of the 1,4-trans-PBD block was promoted by RuC12（PPh3）3 used as a catalyst to produce iPS-b-PE.展开更多
基金supported by the National Natural Science Foundation of China(Nos.21174167 and51573212)the Natural Science Foundation of Guangdong Province(Nos.S2013030013474 and 2014A030313178)
文摘Herein, we demonstrate the synthesis of a well-defined diblock copolymer consisting of isotactic polystyrene （iPS） and linear polyethylene, isotactic polystyrene-block-polyethylene （iPS-b-PE）, by the combination of sequential monomer addition and hydrogenation. Isospecific living polymerization of styrene and living trans-1,4-polymerization of 1,3-butadiene were catalyzed by 1,4-dithiabutandiyl-2,2＇-bis（6-cumenyl-4-methylphenoxy） titanium dichloride （complex 1） activated by triisobutyl aluminum modified methylaluminoxane （MMAO） at room tempera^xre to provide highly isotactic polystyrene （iPS） and 1,4-trans-polybutadiene （1,4-trans-PBD） with narrow molecular weight distribution. Furthermore, the iPS-b-I,4- trans-PBD was synthesized via sequential monomer addition in the presence of complex 1 and MMAO. The hydrogenation of the 1,4-trans-PBD block was promoted by RuC12（PPh3）3 used as a catalyst to produce iPS-b-PE.
