ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Influence of polyfunctional monomers on crosslinking of polypropylene

M. Čapla, M. Lazár, and A. Pajchortová

Polymer Institute, Centre of Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The relative efficiency of crosslinking of polypropylene in the course of thermal decomposition of dicumyl peroxide in the presence of nine different polyfunctional monomers and their mixtures has been investigated. The coagents with the highest content of reactive functional groups are the most efficient, which suggests that the macroradicals originating from degrading polypropylene may be added to reactive linking bridges. Some mixtures of polyfunctional monomers exhibit synergic effect in crosslinking. It may be explained by the assumption that the alkyl radicals are transformed into allyl radicals which have considerably more favourable ratio of recombination to disproportionation. An increase in portion of recombination to the detriment of disproportionation raises the extent of formation of crosslinks between macromolecules of the polypropylene modified by the effect of polyfunctional monomer.

Full paper in Portable Document Format: 374a561.pdf

Chemical Papers 37 (4) 561–566 (1983)