INITIAL EVALUATION OF DIPHENYL OXIDE RESINS.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
Pagination or Media Count:
Diphenyl oxide was shown to condense readily with p-xylylene dichloride under mild conditions to give soluble, fusible thermosetting resins. These have been used to make laminates with a variety of reinforcing fibres, of which chrysotile asbestos and aluminum silicate were the most satisfactory. Long term heat-ageing tests on chrysotile asbestos laminates showed a thermal stability similar to that of analogous Friedel-Crafts resins based on terphenyl, but with better initial hot-strength than the latter. The hydrolytic stability of diphenyl oxide based materials was good, but the resistance to concentrated acid and alkali was relatively poor. A new series of Friedel-Crafts polymers Mark 2 was discovered based on the aromatic methoxymethyl derivative. These cure more slowly than resins made from the corresponding dichloromethyl compound. The Mark 2 resins appear to have application in the field of insulation both as impregnating media and as thermosetting moulding compounds. Author
- Polymer Chemistry