PEROXIDE GRAFTING OF POWDERED POLYPROPYLENE BY BUTYL ACRYLATE

The efficiency of the grafting of powdered polypropylene (PP) by butyl acrylate (BA) initiated by tert.-butylperoxy-2-ethylhex-as a ratio of the grafted and polymerized monomer was relatively high during the whole course of the reaction and it does not decrease under 0.5. The relatively high polymerization rate and also grafting efficiency at the beginning of the reaction is refered to the gel effect - the monomer is absorbed in the amorphous part of the powdered PP. With increasing the content of monomer in the reaction feed, the content of unsoluble cross-linked polymer increased as the consequence of the radical cross-linking of polybutylacrylate chains. The mechanism of grafting of powdered PP by BA is discussed.