Cross-linking effect of polyethylene-polypropylene blend films prepared by gelation/crystallization from solution

Abstract

Cross-linking of polyethylene-polypropylene blend films, prepared by gelation/crystallization from solutions, was done according to the following two methods. One was carried out under elongation of the blend gel films containing dicumyl-peroxide. The other was with electron-beam irradiation of the undrawn specimens and subsequently the specimens were elongated. The mechanical properties of the resultant specimens in undrawn and drawn states were found to become much weaker with increasing polypropylene content. This phenomenon was attributed to the considerable scission of main-chains of polypropylene. Consequently it turned out that both methods are appropriate for producing a net cross-linking effect of polyethylene occurring preferentially in the amorphous regions. © 1987 The Society of Polymer Science, Japan.