Cheng Lin, Jian X-Gao
Aug 27, 2010
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Journal
Chinese Journal of Chemistry
Abstract
Two novel heterocylic diamine monomers: l,2-dihydro-2-(4-aminophenyl)-4-4-(4-aminophenoxy) phenyl]-(2H)-phthalazin-l-one and 1,2-Dihydro-2-( 4-aminophenyl )-4-[4-(4-aminophenoxy-3, 5-dimethylphenyl]-(2H)-phthalazin-1-one were successfully synthesized using readily available heterocyclic bisphenol-like monomers through two steps in high yield. A series of novel poly(aryl ether amide)s containing the phthalazinone moiety with inherent viscosities of 1.16–1.67 dL/g were prepared by the direct polymerization of the novel diamines and aromatic dicarboxylic acids using triphenyl phosphite and pyridine as condensing agents. The polymers were readily soluble in a variety of solvents such as N,N -dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), dimethylsulfoxide ( DMSO ), N-methyl-2-pyrrolidinone (NMP), and pyridine. The polymers had high glass transition temperatures ( Tg) in the 291–329°C range.