NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Phenylethynyl Phthalic AnhydrideControlled molecular weight PhenylEthynyl Terminated Imide oligomers (PETIs) have been prepared by the cyclodehydration of precursor phenylethynyl terminated amic acid oligomers. Amino terminated amic acid oligomers are prepared from the reaction of dianhydride(s) with an excess of diamine(s) and subsequently endcapped with PhenylEthynyl Phthalic Anhydride(s) (PEPA). The polymerizations are carried out in polar aprotic solvents such as N-methyl-2pyrrolidinone or N N-dimethylacetamide under nitrogen at room temperature. The amic acid oligomers are subsequently cyclodehydrated either thermally or chemically to the corresponding imide oligomers. Direct preparation of PETIs from the reaction of dianhydride(s) with an excess of diamine(s) and endcapped with phenylethynyl phthalic anhydride(s) has been performed in m-cresol. Phenylethynyl phthalic anhydrides are synthesized by the palladium catalyzed reaction of phenylacetylene with bromo substituted phthalic anhydrides in triethylamine. These new materials exhibit excellent properties and are potentially useful as adhesives, coatings, films, moldings and composite matrices.
Document ID
19980030794
Acquisition Source
Langley Research Center
Document Type
Other - Patent
Authors
Hergenrother, Paul M. (NASA Langley Research Center Hampton, VA United States)
Smith, Joseph G., Jr. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 18, 2013
Publication Date
October 28, 1997
Subject Category
Chemistry And Materials (General)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-Case-LAR-15176-3|US-Patent-5,681,967
Patent Application
US-Patent-Appl-SN-330773|US-Patent-Appl-SN-739350

Related Records

There are no records associated with this record.
No Preview Available