The effect of short chain branching on local chain organisation in isotopically labelled blends of polyethylene

COUTRY, S. and SPELLS, S. (2002). The effect of short chain branching on local chain organisation in isotopically labelled blends of polyethylene. Polymer, 43 (18), 4957-4965.

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Abstract

The complementary techniques of small angle neutron scattering (SANS) and infra-red spectroscopy have been used to determine features of molecular trajectory for isotopic blends incorporating linear polyethylene and copolymers containing butyl or hexyl branches. SANS data show both a more compact conformation for a copolymer guest molecule than for a linear guest and also a smaller molecular expansion with increasing molecular weight when both guest and host are copolymers. These blends also show the smallest proportion of {110} isolated guest stems, while wholly linear blends show the largest proportion, on the evidence of the infra-red CD2 bending band profiles. Estimates are made of the sizes of ‘groups’ of adjacent stems, and these also show a corresponding dependence on the sample type, indicating a higher proportion of adjacent re-entry for copolymer blends than for linear blends.

Item Type:	Article
Additional Information:	Copyright © 2002 Elsevier Science Ltd
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Identification Number:	10.1016/S0032-3861(02)00334-8
Depositing User:	Ann Betterton
Date Deposited:	16 Aug 2007
Last Modified:	09 Aug 2010 14:14
URI:	http://shura.shu.ac.uk/id/eprint/928

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