A mechanochemical modification of a third-generation polyethylene with maleic anhydride
Polimery 2000, No 6, 393
SummaryReactive extrusion in a Brabender extruder equipped with a conventional annular or a prototype mixer (static or dynamic) was used to graft maleic anhydride onto a third-generation PE in the presence of benzoyl peroxide as initiator. IR spectroscopy (band intensity at 1780 cm-1 attributable to anhydride's CO group stretching vibrations) confirmed grafting to have occurred and to rise as the initiator's concentration and shearing stress (Fig. 2) were increased. At low peroxide initiator's concentrations, grafting was not accompanied by cross-linking side reactions of PE chains. As the initiator's concentration was increased, the melt index and the degree of crystallinity of the products of the mechanochemical reactions decreased (Figs. 3, 4).