Phenylphosphine oxide-containing poly(arylene ether)s were prepared by the aromatic nucleophilic displacement reaction of a new phenylphosphine oxide-containing bisphenol with activated aromatic difluorides in the presence of anhydrous potassium carbonate in N,N'-dimethylacetamide at 155°C or in sulfolane at 200°C. The phenylphosphine oxide-containing bisphenol was prepared in two steps from bis(4-fluorophenyl)phenylphosphine oxide and 4-methoxyphenol. The polymers exhibited inherent viscosities of 0.574).75dig-~ and glass transition temperatures of 177-213°C. Thermogravimetric analyses showed 5% weight loss in the ranges of 447-471 °C in air and 480-512°C in nitrogen. Unoriented thin films exhibited tensile strengths, moduli and break elongations at 23°C of 8.1-11.1ksi, 275-370ksi and 42-109%, respectively. Limiting oxygen indices of 0.30-0.33 were calculated based on polymer char residues at 850°C in nitrogen. Phenylphosphine oxide-containing poly(arylene ether)s exhibited excellent resistance to an oxygen plasma environment with weight loss rates of one to two orders of magnitude lower than that of Kapton ® HN. The chemistry, and physical and mechanical properties of these polymers, as well as their oxygen plasma resistance, are discussed
Посилання на статтю:
Oxygen plasma resistant phenylphosphine oxide-containing poly(arylene ether)s / J. G. Smith Jr, J. W. Connell* and P. M. Hergenrother // Polymer. – 1994. – Vol 35. – P. 2834-2839.