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New addition curing polyimidesIn an attempt to improve the thermal-oxidative stability (TOS) of PMR-type polymers, the use of 1,4-phenylenebis (phenylmaleic anhydride) PPMA, was evaluated. Two series of nadic end-capped addition curing polyimides were prepared by imidizing PPMA with either 4,4'-methylene dianiline or p-phenylenediamine. The first resulted in improved solubility and increased resin flow while the latter yielded a compression molded neat resin sample with a T(sub g) of 408 C, close to 70 C higher than PME-15. The performance of these materials in long term weight loss studies was below that of PMR-15, independent of post-cure conditions. These results can be rationalized in terms of the thermal lability of the pendant phenyl groups and the incomplete imidization of the sterically congested PPMA. The preparation of model compounds as well as future research directions are discussed.
Document ID
19920004063
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Frimer, Aryeh A.
(NASA Lewis Research Center Cleveland, OH, United States)
Cavano, Paul
(Case Western Reserve Univ. Cleveland, OH., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Subject Category
Chemistry And Materials (General)
Report/Patent Number
NASA-TM-105335
NAS 1.15:105335
E-6702
Meeting Information
Meeting: International Conference on Polyimides
Location: Ellenville, NY
Country: United States
Start Date: October 30, 1991
End Date: November 1, 1991
Sponsors: Society of Plastic Engineers
Accession Number
92N13281
Funding Number(s)
PROJECT: RTOP 510-01-50
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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