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Cure Chemistry of Phenylethynyl Terminated OligomersThe ability to process high performance polymers into quality, void-free composites has been significantly advanced using oligomers terminated with reactive groups which cure or crosslink at elevated temperature without the evolution of volatile byproducts. Several matrix resin systems of considerable interest to the aerospace community utilize phenylethynyl-terminated imide (PETI) technology to achieve this advantage. The present paper addresses the cure chemistry of PETI oligomers. The thermal cure of a low molecular weight model compound was studied using a variety of analytical techniques including differential scanning calorimetry, Fourier transform infrared spectroscopy, and liquid chromatography-mass spectroscopy. The studies indicate an extremely complex cure process. Many stable products were isolated and this paper reports current work on identification of those products. The intent of this research is to provide fundamental insight into the molecular structure of the cured PETI engineering materials so that performance and durability can be more fully assessed.
Document ID
20040110259
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Wood, Karen H. (College of William and Mary Williamsburg, VA, United States)
Orwoll, Robert A. (College of William and Mary Williamsburg, VA, United States)
Young, Philip R. (Emory and Henry Coll. Emory, VA, United States)
Jensen, Brian J. (NASA Langley Research Center Hampton, VA, United States)
McNair, Harold M. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1997
Subject Category
Inorganic, Organic And Physical Chemistry
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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