Gerard A. Loughran
Oct 1, 1970
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Abstract
Abstract : A new compound (2H,7H),3,1,8,6-benzobisoxazine-2,4,7,9,(1H,6H)- tetraone was prepared by reaction of phosgene with 2, 5-diaminoterephthalic acid. The thermal decomposition of (2H),3,1-benzoxazine-2,4,(1H)-dione was studied as a model reaction. The reaction involves initial loss of carbon dioxide at 360C and the formation of trimeric and tetrameric cyclic aryl amides, followed by dehydration to highly condensed structures. (2H,7H),3,1,8,6- benzobisoxazine-2,4,7,9(1H,6H) tetraone and 6,6'-bis-(2H),3,1-benzoxazine-2,4, (1H)-dione each were decomposed thermally under similar conditions. The resulting products were highly condensed cross-linked polymers of high thermal stability.