Cationic modifications of polyalkenes. Polyethers as modificators of polypropylene and polyethylene

Carbocations generated on polypropylene (or polyethylene) chains are able to bond the polar polymer, e.g. poly(oxytetramethylene), poly(oxyethylene), poly(oxyphenylene) or polysiloxane onto the hydrocarbon chains. The copolymers polypropylene- block -poly(oxyethylene) and polypropylene- graft -poly(oxyethylene) have outstanding compatibilizating ability in a polypropylene-CaCO 3 composite. The above named copolymer (2 mass %), mixed with polypropylene and surface non-treated CaCO 3 , produce a composite with 50% higher impact toughness, lower melt viscosity (better flow in) and better dispersion of the filler in the matrix in comparison with the standard composite consisting of the same polypropylene matrix and treated CaCO 3 (calcium stearate and stearic treatment).