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Evidence of intra-chain phase separation in molten short-chain branched polyethylene

Journal: eXPRESS Polymer Letters
ISSN 1788-618X

Volume: 5;
Issue: 4;
Start page: 327;
Date: 2011;
Original page

Keywords: Rheology | phase separation | linear low density polyethylen | time-temperature superposition

Intramolecular phase separation is usually associated with block-copolymers, but the same phenomenon is also obtainable by random-copolymers. In this article, evidence of intramolecular phase separation is reported for a linear octadecene-ethene copolymer, which shows an evolving 'yield point' at a long time and low frequency. This is attributed to a partial phase separation of the long short-chain branches. In creep recovery, this behavior is evident as increasing elastic steady-state creep recovery compliance Je 0. In contrast to 'normal' block-copolymers, this special polymer has an increase in phase separation with temperature, which is caused by the chemical composition and the short chain segments in the side chain domain, leading to a high surface fraction.
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