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