ethylene group

ethylene group

or

ethylene radical

n
(Elements & Compounds) chem the divalent group, -CH2CH2-, derived from ethylene
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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But in PET the shorter ethylene group makes crystallinity optional.
Simple group-contribution calculations of [Delta] for various structures show that structures consisting of side-chains separated by more than three ethylene groups (making detection difficult using 13C NMR techniques) still possess sufficient immiscibility with the intervening LPE block structures to promote microphase separation in the melt phase.
This could be done by adding an additional coordinate, such as, for example, the number N of consecutive ethylene groups existing between the branching monomer groups, a parameter readily related to other measures of branch content.

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