Abstract
Isotactic polypropylene block copolymers, isotactic-polypropylene- block-poly (methyl methacrylate) ( i-PP- b-PMMA) and isotactic-polypropylene- block-polystyrene ( i-PP- b-PS), were prepared by atom transfer radical polymerization (ATRP) using a brominated styrene-terminated isotactic polypropylene macroinitiator synthesized from bromination of styrene-terminated isotactic polypropylene. The styrene-terminated isotactic polypropylene can be obtained by polymerization of propylene in the presence of styrene and hydrogen chain transfer agents using a rac-Me 2Si[2-methyl-4-(1-naphyl)Ind] 2ZrCl 2 as catalyst. The molecular weights of isotactic polypropylene block copolymers were controlled by altering the amount of hydrogen used in the polymerization of propylene and the amount of monomer used in the blocking reaction. The effect of i-PP- b-PS block copolymer on PP–PS blends and that of i-PP- b-PMMA block copolymer on PP–PMMA blends were studied by scanning electron microscopy.
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