Synthesis of Crown Ether Polymers Incorporating 12- and 13-Membered Tetraoxa Rings Linked to Poly(propylene Oxide) and Poly(phosphazene) Backbones and Behaviour of the Lithium-doped Materials
The synthesis of a set of 12- and 13-membered crown ether polymers is reported.An oxyethylene chain separates the macrocyclic ring from either a poly(propylene oxide) or a poly(phosphazene) backbone.Addition of Li+ ions to these amorphous polymers and the related poly(methacrylate) polymers results in increases in Tg and the 12-O4 polymers show the largest increases.This behaviour is correlated with changes in the 13C NMR spectra of the polymers as Li+ is added, and the relative sensitivity of the 12-O4 polymers is related to their enhanced tendency to form 2:1 complexes (ring : Li+).Parallel observations were found on examination of the ionic conductivities of the lithium-doped materials, with the 13-O4 polymers showing lower conductivities and in the polypropylene oxide-based polymers the backbone did not contribute significantly to the overall charge transport.
Denness, James E.,Parker, David,Hubbard, Hugh St. V. A.
p. 1445 - 1454
(2007/10/02)
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