Radiation effects in ricinyl-2-oxazoline maleate-modified polypropylene
Polimery 2000, No 6, 416
SummaryPolypropylene (PP) and ricinyl-2-oxazoline maleate-modified polypropylene were irradiated with a 10-MeV electron beam (from a LAE 13/9 linear accelerator). The resulting radicals were studied by electron paramagnetic resonance spectroscopy (EPR). The chemical modification of PP was found to have affected the mechanism of radical formation (Figs. 4–6). The chemical and radiative modification of PP was found to proceed through the formation of peroxy rather than alkyl radicals, because the 2-oxazoline maleate group is an efficient scavenger of alkyl radicals. The incorporation of ricinyl-2-oxazoline maleate into the PP chain and the degradation of the PP chain by the fast electron beam resulted in a modified melt flow rate index (MFR), viscosity (Table 1) and thermal properties as evidenced by DSC (Table 2, Figs. 8, 9).