Design and Synthesis of Graft SIS with Ordered Polystyrene Side Chains

A series of (p-vinylbenzyl)polystyrene macromonomers were synthesized by living anionic polymerization using styrene and p-vinylbenzyl chloride(VBC) as monomers. The graft block copolymer, styrene-isoprene-styrene (SIS) with ordered polystyrene side chains was prepared by one-pot method using n-BuLi as initiator, THF as modifier, cyclohexane as solvent, polystyrene macromonomer and isoprene as monomers. The polystyrene macromonomers and graft SIS were characterized by proton nuclear magnetic resonance spectroscopy and gel permeation chromatography, and the rheological properties of graft SIS were characterized by rotational rheometer.The results showed that polystyrene macromonomers with relative molecular mass of 3000~5000 were successfully synthesized by the above polymerization method. The graft SIS synthesized by polystyrene macromonomers had relative molecular mass between 1.0×105~1.4×105 and relative molecular mass distribution between 1.1~1.2. For the similar relative molecular mass, the apparent viscosity of the graft SIS was obviously lower than that of linear SIS. © 2019, Editorial Office of FINE CHEMICALS. All right reserved.