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Copolycarbonates and Poly(arylates) Derived From Hydrolytically Stable Phosphine Oxide Comonomers.


pdf icon Copolycarbonates and Poly(arylates) Derived From Hydrolytically Stable Phosphine Oxide Comonomers. (680 K)
Knauss, D. M.; McGrath, J. E.; Kashiwagi, T.

Chapter 3; ACS Symposium Series 599;

American Chemical Society. Fire and Polymers II: Materials and Tests for Hazard Prevention. National Meeting, 208th. ACS Symposium Series 599. August 21-26, 1994, Washington, DC, American Chemical Society, Washington, DC, Nelson, G. L., Editor(s), 41-55 pp, 1995.

Sponsor:

National Science Foundation, Washington, DC

Keywords:

fire retardants; flame retardants; phosphine oxides; phosphorus compounds; copolymers; monomers

Abstract:

Hydrolytically stable bis(4-hydroxyphenyl) phenyl phosphine oxide was synthesized and utilized to produce high molecular weight polycarbonate and aromatic polyester copolymers. The glass transition temperature increased from about 150 deg C for the control bisphenol-A polycarbonate system to 186 deg C for the 50 wt. percent copolymer. The char yield via dynamic TGA in air increased from 0% for the control to 30% at 700 deg C for the 50% copolymer. The homopolymer had a Tg of 202 deg C, but only low molecular weight was achieved. In contrast, tough, transparent, high Tg polyarylates were prepared with terephthaloyl chloride that had a high char yield in air. Transparency and toughness were maintained in the copolymers, and the char yield in air increased significantly with phosphorus concentration. The materials are being characterized as improved fire resistant transparent systems and initial cone calorimetry studies do show that the heat release rate is significantly decreased. The residual carbon monoxide concentration does increase, which is consistent with the incomplete combustion.