Preparation and properties of polyformals obtained from 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3,-hexafluoropropane and dichloromethane
Conference
·
OSTI ID:141635
- Kanagawa Univ., Yokohama (Japan)
Fluorine-containing aromatic polyformal and copolyformals were prepared from 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3,-hexafluoropropane (bis-phenol AF) and/or 2,2-bis(4-hydroxyphenyl)-propane (bisphenol A) with dichloromethane. High molecular-weight polyformal and copolyformals were obtained by using NMP as solvent and in the presence of KOH. The thermal stability was lowered with increasing fluorine content. The Tg increased monotonically with fluorine content from 89{degrees}C for bisphenol A polyformal to 17{degrees}C for bisphenol AF polyformal. Bisphenol a polyformal was soluble in limited solvents, whereas bisphenol AF polyformal was soluble in a wide variety of solvents such aprotic polar solvents, aromatic solvents and chlorinated hydrocarbons.
- OSTI ID:
- 141635
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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