PHOSPHONITRILIC POLYMERS STABLE AT HIGH TEMPERATURES.
Final rept. 1 Nov 64-31 Oct 65,
UNITED STATES RUBBER CO WAYNE N J RESEARCH CENTER
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The objective of the investigation was the development of new thermoplastic and thermosetting resins from phosphonitrilic chloride trimer for high temperature electrical applications. The preparation of the tetraphenoxydichlorophosphonitrile trimer I was scaled up to yield a total of thirty pounds of this monomer. A soluble P-O-P linked polymer of I was obtained and found to be stable to 317C. The P-O-P linked polymer in which the theoretical repeating unit is -P3N3OC6H54O- appears slightly more stable than the polymer with the theoretical repeating unit -P3N3C6H52OC6H52O-. Monomer I was reacted with several aromatic diols and the resulting polymers examined by thermogravimetric analysis. Polar solvents accelerate the reaction of P3N3Cl6 and hydroquinone at 80C. A soluble polymer of MW6000 was prepared from P3N3OC6H54Cl2 and disodiobisphenol A. Fire-retardant self-extinguishing glass cloth laminates were prepared from both P-O-P and bisphenol A- linked polymers. Author
- Polymer Chemistry