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| Ideal for aircraft panels and other applications requiring transparent, burn-resistant film or sheet, this blend of polyarylate and poly(ether ketone ketone) is produced by this technology. The use of the less expensive polyarylate maintains the superb mechanical properties of the PEKK.relates films sheets blends certain amorphous poly(aryl ether ketones) polyarylates laminates polyvinyl fluoride (PVF) Poly(aryl well-known class engineering polymers outstanding mechanical flammability suited high-value applications panels aircraft interiors poly(ether (PEKKs) directly indirectly diphenyl mixture terephthalyl (T) chloride isophthalyl (I) varying T/I ratios crystalline melting point 330 deg higher Melt processability depends extent normally temperatures glass transition range 120-190 readily processable less expensive sometimes laminated commercially valuable desirable blended least imparing common PEKK&aposs following structure [(CO-Ph-CO)subx (CO-Ph&apos-CO)suby Ph] 4-phenylene 3-phenylene C=O positive numbers (In nomenclature methane CHsub4) miscible partially 10-90 percent (preferably 50-70 wt %) isotropic derived reaction dihydric phenols aromatic dicarboxylic acids 90-10 30-50 ketone) repeating units formula 0-40% (x+y) 55-65% latter 60% remainder compared corresponding neat transparency heat release/burning practice proportions depending particular Preferred resorcinol hydroquinone bisphenol mixtures thereof isophthalic iso- terephthalic inherent viscosity 04 050-075 solution 25/75 trifluoroacetic methylene concentration g/dl index 10-80 20-50 340 Bisphenol component completely 30% former level 30-70% resorcinol-based preferred isomer 6040 produces comparison 5050 extruded alone 300-315 suppresses dripping lowers hand accelerates charring stages evidenced unexpected accelerated (nonlinear) reduction peak increasing content find resistance good compounding additives present stabilizers antioxidants pigments reinforcing agents ultraviolet light Components dried hydrolytic degradation operating kept thermal Standard blending equipment twin-screw extruders molten protected exposure crucial always case Crystalline definition miscibility extrudable semi-crystalline Completely possess added |
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