Grafting of maleic anhydride (MAH) onto ethylene-propylene rubber (EPR) was performed by melt mixing in a laboratory-scale internal mixer with the addition of an initiator (dicumyl peroxide, DCP) and an ingredient (stearamide, SA) for the suppression of side reactions of cross-linking and chain scission. Effective suppression of side reactions was realized for systems of moderate or low DCP contents upon addition of SA, but no apparent changes could be identified at high DCP loadings. Within the confidence level of Fourier-transform infrared spectroscopic measurements, the extent of grafting appeared to be little affected by the addition of SA. Possible reaction paths in the present system are discussed. In particular, SA is considered as a chain transfer agent which tends to suppress the more populated reaction path, whether it be cross-linking or chain scission.
Посилання на статтю:
Suppression of side reactions during melt functionalization of ethylene-propylene rubber / C. H. Wu and A. C. Su* // Polymer. – 1992. – Vol 33. – P. 1987-1992.