Abstract
The frequency of long-chain branches (LCBs) in ethene (E)-methyl acrylate (MA) copolymers is investigated for material that was synthesized at 150°C and 2000 bar at different levels of conversion but constant copolymer composition. The copolymers exhibit significantly more LCBs than found to LDPE synthesized under similar conditions. Moreover it is found that the LCB frequence increases with conversion. At 0.3 mol-% conversion, 0.3 LCBs and at 4.0 mol-% conversion, 1.1 LCBs per 1000 C atoms are observed. In addition, the frequency of of short-chain branches (SCBs) in the copolymers is investigated. About 9 mol-% of the acrylate units are alkylated, which corresponds to numbers given in literature. As sensors, both LCB and SCB indices provise valuable information for simulations for determine rate coefficients for inter- and intramolecular transfer reactions.
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