Synthesis and characterization of polyaryleneetherketone triphenylphosphine oxides incorporating cycloaliphatic/cage hydrocarbon structural units

Autor: N. Venkatasubramanian, Joel A. Johnson, Thuy D. Dang, Matthew J. Dalton, William A. Feld, Clifford A. Cerbus
Rok vydání: 2004
Předmět:
Zdroj: Journal of Polymer Science Part A: Polymer Chemistry. 42:6134-6142
ISSN: 1099-0518
0887-624X
Popis: New high temperature polyaryleneetherketone triphenylphosphine oxides incorporating trans-1,4-cyclohexane, 1,3-adamantane, and 4,9-diamantane structural units were synthesized by the base-promoted polymerization reaction between 4,4'-difluorotriphenylphosphine oxide and the novel dihydroxy monomers trans-1,4-bis(4-hydroxybenzoyl)cyclohexane, 1,3-bis(4-hydroxybenzoyl)adamantane, and 4,9-bis(4-hydroxybenzoyl)diamantane. The monomers were synthesized in a good yield by a two-step procedure involving the Friedel-Crafts acylation of anisole by the diacid chlorides trans-1,4-cyclohexanedicarbonyl chloride, 1,3-adamantanedicarbonyl chloride, and 4,9-diamantanedicarbonyl chloride, followed by demethylation with pyridine hydrochloride. The polymers, which could be processed into tough, free standing films from organic solvents, exhibited high T g 's in the range of 192-239° as well as thermooxidative stabilities (5% weight loss in air) in the range of 445-490°. Preliminary results from a UV-visible spectroscopic study of dilute solutions of the polymers in chloroform showed absorption maxima in the 263-274 nm region and transparency to spectral radiation in the 300-800 nm range, indicating that these triphenylphosphine oxide polymers could have potential applications for space thermal control coatings.
Databáze: OpenAIRE
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