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 solids 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 30, 1988
- Accession Number
- ADA208744
Entities
People
- Brijnaresh R. Sinha
- Daniel T. O'Connor
- Frank D. Blum