2006•Acta Polymerica SinicaOpen access

SOLID-STATE HIGH-RESOLUTION ~(13)C and ~7Li-NMR STUDIES OF POLY(ETHYLENE OXIDE)/LITHIUM PERCHLORATE/WATER COMPLEXES

Qun Chen

Abstract

A series of poly(ethylene oxide)(PEO)/LiClO_4 complex samples with different molar ratios were studied systematically by solid-state high-resolution()~(13)C and()~7Li-NMR spectroscopy.It was found that with the presence of a small amount of water(9%～16% by weight),the initial increase of LiClO_4 gradually destroys crystals formed by PEO,while further increase of LiClO_4 brings about the crystals formed by PEO and Li~+.When the molar ratio of PEO to LiClO_4 is in the range of 6/1 to 8/1,the complex samples are completely amorphous.The()~7Li-NMR results indicate clearly that the existence of water hinders the formation of Li~+-PEO crystals.

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Key concepts: Lithium perchlorate, Ethylene oxide, Lithium (medication), Amorphous solid, Poly ethylene, Oxide, Materials science, Ethylene