OXYPOLYPROPYLENE AS A RADICAL INITIATOR FOR THE PRODUCTION OF POLYPROPYLENE GRAFTED COPOLYMER

摘要

Oxypolypropylenes are high MFR propylene polymers that contain bound peroxide functionalities which can be used as polymerization initiators to produce polypropylene grafted copolymers. Upon heat treatment, the peroxides functionalities in the Oxypolypropylene act as a source of free radicals, reacting with unsaturated double bond of the monomers. The grafting reaction is carried out in the solid state in a reactor. The advantage of grafting via Oxypolypropylene is that it eliminates expensive and environmentally unfriendly organic peroxide. A number of monomers have been grafted on Oxypolypropylene, including vinyl acetate, vinyl pyrrolidinone, methacrylic anhydride, maleic anhydride... Applications of these grafted copolymers in nylon blends or in a glass reinforced formulation are also discussed.