Low toxicity high temperature pmr polyimides

Details Low toxicity high temperature pmr polyimides Low toxicity high temperature pmr polyimides

C - Chemistry, Metallurgy

08

G

C08G 73/10 (2006.01) C08G 61/12 (2006.01)

Patent

CA 2060950

LOW TOXICITY HIGH TEMPERATURE PMR POLYIMIDES Abstract of the Disclosure An improved low toxicity polymerization of monomer reactants (PMR) system has 3,4'-oxydianiline as the key monomer reactant. One variation of this system, LaRC-RP46, is prepared by reacting together monomethyl ester of 5-norbornene-2,3-dicarboxylic acid (NE),3,4'-oxydianiline (3,4'-ODA), and dimethyl ester of 3,3',4,4' benzophenonetetracarboxylic acid (BTDE); this combination is then treated with heat. This new matrix resin is readily processed into a high quality graphite fiber reinforced composite with excellent reproducibility. The flexibility of the ether linkage in 3,4'-ODA provides high toughness. The composite retains excellent mechanical properties both at 316°C and at 371°C. The development of LaRC-RP46 will significantly extend the applications of PMR type polyimides.

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