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Processable Oligomeric and Polymeric Precursors to Silicates Prepared Directly from SiO2, Ethylene Glycol and Base.

Published online by Cambridge University Press:  25 February 2011

Clint Bickmore ,
Martin L. Hoppe  and
Richard M. Laine
Clint Bickmore
Affiliation:
Departments of Materials Science and Engineering, and Chemistry, Univ. of Michigan, Ann Arbor, MI 48109-2136
Martin L. Hoppe
Affiliation:
Departments of Materials Science and Engineering, and Chemistry, Univ. of Michigan, Ann Arbor, MI 48109-2136
Richard M. Laine
Affiliation:
Departments of Materials Science and Engineering, and Chemistry, Univ. of Michigan, Ann Arbor, MI 48109-2136
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Abstract

Bimetallic glycolato silicates of the form M2 Si2(OCH2CH2O)5 where M is an alkali metal, can be synthesized directly from SiO2, ethylene glycol and MOH. Further reaction with HO(CH2CH2O)4H, PEG4, transforms these compounds into rheologically useful polymers. These polymers offer considerable potential for processing novel silicate glass shapes, e.g. thin films, fibers and membranes, from relatively inexpensive precursors materials. In this paper, we describe pyrolysis studies on the model compound Li2 Si2(OCH2CH2O)5 as a prelude to determing the utility of the polymeric precursors. These studies delineate the effects of temperature on the decomposition processes whereby the glycolato silicate transforms into almost phase pure, crystalline Li2O-2SiO2. This work is contrasted with previous pyrolysis studies on K2 Si2(OCH2CH2O)5.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 81
Copyright
Copyright © Materials Research Society 1992

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References

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