Abstract
A homogeneous metallocene Et(Ind)2ZrCl2 with MAO were used in the polymerization of polypropylene. This catalyst system produced a isotactic, and chain end unsaturated polypropylene. Borane was employed added to polypropylene to prepare a borane-containing polypropylene which can be transformed to hydroxyl-terminated polypropylene. Telechelic hydroxyl-terminated polypropylene, PPOH, can react with toluene diisocyanatc (TDI) to form a prepolymer-containing chain-end NCO functional group, PP-NCO. By using the resulting materials as macroactivators for anionic-ring-opening polymerization of caprolactam, a polypropylene-nylon 6 diblock copolymer was obtained. On the other hand, borane-containing polypropylene can react with oxygen to produce the free radicals located at the chain end on polypropylene. The free radical is effective initiator for the polymerization of methylmethacrylate to produce diblock copolymer of PP-b-PMMA. A diblock copolymer of PP-b-PU was also prepared. The block copolymers have been characterized by IR, NMR, and DSC. The diblock copolymer is a compatibilizer for various polypropylene blends with other polymers.
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