A Co‐60 source was used to irradiate compositions based on PVC, and containing plasticizer additives including DIDP and TOTM, and chlorinated PE (CPE). Polyfunctional acrylic monomers were used as crosslinking agents, and irradiation dosages to about 8Mrad were applied to crosslink the compounds. Analyses included crosslink density estimates from solvent swelling data, and stress/strain evaluations of mechanical responses. It was shown that plasticizers reduce the crosslinking efficiency of irradiation, TOTM being the better inhibitor. The presence of CPE counteracts the trend. Mechanical properties differentiate strongly between the use of difunctional and trifunctional crosslinking agents. The latter produce networks at higher dosages (Eq > 4Mrad) characterized by two apparent yield stresses. This suggests the presence of two (or more) distinct network structures. DSC scans of partially crosslinked samples support the contention. The work indicates the importance of composition‐property relationships in multicomponent vinyl systems.
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Bataille et al. (1989) studied this question.
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