Kinetics and relaxation of end crosslinked polymer networks

Gary S. Grest, Kurt Kremer and Edgardo R. Duering

Physica A: Statistical Mechanics and its Applications, 1993, vol. 194, issue 1, 330-337

Abstract: The kinetics of end crosslinking in linear polymer melts and the dynamics of the resulting networks is studied using molecular dynamics simulations. Starting from an equilibrated melt, tri- and tetrafunctional crosslinkers are attached randomly to a fraction x of the chain ends. When a free end comes within a short capture distance rx from an unsaturated crosslinker, the chain ends are attached. With a stoichmetric number xs of crosslinkers present, the long time kinetics of the number of free ends and number of unsaturated crosslinkers decay as a power law in time t−a, with a ≈ 0.5. For x ≠ xs, the decay is significantly faster. These “model” networks are then used to show that entanglements play an important role in determining the elastic modulus of the network.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:194:y:1993:i:1:p:330-337

DOI: 10.1016/0378-4371(93)90366-C

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