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Abstract

As part of an effort to develop a low-volatile, essentially dry, carbon fiber tape from a phenylethynyl-terminated imide for use in heated head automated tow placement, a 70:30 blend of LaRC^TM PETI-5 and LaRC^TM PETI-IAX was prepared in N-methyl-2-pyrrolidinone by mixing the phenylethynylterminated amide acid solutions together. Solutions of the amide acids and the blend were characterized by size exclusion chromatography after aging at room temperature and at 5 °C over a 30-day period. Thin films were periodically cast from the solutions, thermally cured, and the tensile properties determined. Unoriented thin-film tensile properties were unaffected by aging conditions over the 30-day period whereas the weight average molecular weights of the phenylethynyl-terminated amide acids decreased. Imide oligomers were prepared from the amide acids, characterized, and thermally cured. A low-volatile tape prepared from prepreg of the 70:30 blend was fabricated into composites by processing in a vacuum press. The thin-film tensile and composite properties of the blend generally followed a rule of mixtures.

Keywords

Phenylethynyl imide oligomer high-performance/high-temperature resins composites films 4-phenylethynylphthalic anhydride

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Chemistry and Properties of a Phenylethynyl-Terminated Imide Blend

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