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This study investigated the morphological, thermal and mechanical changes with increasing crosslink density for two low density polyethylenes (LDPE). A reference LDPE was compared with an LDPE containing a higher number of vinyl groups that was introduced via a copolymerisation with a diene. During crosslinking, two reactions simultaneously occur in the copolymer, i.e. a reaction of the vinyl groups...
In the present study, we investigate the crosslinking behaviour of 6 ordinary low density polyethylenes, and the effect of relatively modest changes in the polyethylene structure on the properties of the resulting network. The observed variations in gel formation are mainly explained by differences in molecular weight, where both M¯n and M¯w affect the results. The presence of long chain branches...
This characterisation and crosslinking study has been carried out on a new low density polyethylene, a poly(ethylene-co-divinylsiloxane), copolymerised via a free radical mechanism in a high pressure reactor. This copolymer enabled a study of the role of vinyl groups in the peroxide crosslinking mechanism without the interference of allylic hydrogens; such interference has been present in previous...
The response of poly(ethylene-co-1,9-decadiene) to peroxide treatment was examined and compared with a reference. The polymers were produced in a low-pressure process using a chromium-based catalyst giving a relatively high level of inherent unsaturations through thermal termination of the polymerisation. The copolymerisation with 1,9-decadiene gave an additional 63% vinyl end groups in the polymer...
The response to electron beam irradiation of poly(ethylene-co-1,9-decadiene) was examined and compared to a reference polyethylene. The polymers were produced in a low-pressure process using a chromium-based catalyst giving relatively high levels of inherent unsaturations through thermal termination of the polymerisation. The copolymerisation with 1,9-decadiene gave an additional 63% vinyl end groups...
The peroxide crosslinking properties of a new group of low density polyethylenes (LDPE), unsaturated LDPE, were investigated. These are copolymers between ethylene and 1,9-decadiene and contain a higher number of vinyl groups than ordinary LDPE, situated on pendant carbon chains. Copolymers with different amounts of vinyl groups were crosslinked with dicumylperoxide at 180°C and the crosslinking...
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