Characterization of Substituted Phenol-Formaldehyde Resins Using Solid-State Carbon-13 NMR

Abstract

Crosslinked substituted phenol formaldehyde resins were synthesized from cashew nut shell liquid, 3-n-pentadecylphenol and phenol with formaldehyde. The resulting resins were crosslinked and then investigated using carbon-13 NMR in the solid state using cross-polarization, magic angle spinning, and dipolar decoupling. Comparisons were made between the spectra of pure phenol- formaldehyde and modified phenol-formaldehyde resins and it was shown possible to distinguish between the resins. It was also shown that the proton-dephased spectrum gave better spectral resolution for the substituted compounds. In addition the solid carbon-13 technique verified that the degradation of the substituted phenolic resins occurs first with the degradation of the side chain in agreement with suggestions from earlier work. Keywords: Polymers; Composites; Resins; Friction material; Nuclear magnetic resonance.

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Document Details

Document Type
Technical Report
Publication Date
May 22, 1989
Accession Number
ADA208745

Entities

People

  • Brijnaresh R. Sinha
  • Daniel T. O'Connor
  • Frank D. Blum

Tags

Communities of Interest

  • Counter IED
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Shifts
  • Chemical Synthesis
  • Chemistry
  • Classification
  • Corporations
  • Cross Polarization
  • Formaldehyde
  • Magnetic Resonance
  • Materials
  • Materials Science
  • Military Research
  • Missouri
  • Nuclear Magnetic Resonance
  • Resonance
  • Security
  • United States
  • Universities

Fields of Study

  • Materials science

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  • Organic Chemistry
  • Polymer Science and Technology
  • Reinforced Composite Materials