On the oxidative degradation of nadic end-capped polyimides. 3. Synthesis and characterization of model compounds for end-cap degradation products

Mary Ann B. Meador, J. Christopher Johnston, Aryeh A. Frimer, Pessia Gilinsky-Sharon

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The oxidative degradation of PMR (for polymerization of monomeric reactants) polyimides at elevated temperatures was followed by cross-polarized magic angle spinning (CP-MAS) NMR. Labeling of selected sites in the polymers with 13C allowed for direct observation of the transformations arising from oxidation processes. The formation of several degradation products has been proposed to be occurring in the cross-links derived from the nadic end caps on oxidation. Model compounds have been synthesized and characterized by CPMAS NMR with both normal and delayed decoupling to distinguish between protonated and unprotonated carbons. Comparison of these spectra to predicted chemical shifts of proposed products for the aged polymer provides further insight to degradation occurring in the cross-linked moieties.

Original languageEnglish
Pages (from-to)5532-5538
Number of pages7
JournalMacromolecules
Volume32
Issue number17
DOIs
StatePublished - 24 Aug 1999

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