Characterization of Nylon 6 by 15N Solid State NMR

Abstract

The solid state 15N NMR characterization of nylon 6 is reported. Nylon 6 (20% 15N enriched) was prepared by anionic polymerization of isotopically enriched caprolactam. The samples were prepared by three different treatments: quenched from the melt, slowly cooled and annealed, and artificially plasticized with excess caprolactam. CP/MAS spectra of the 15N enriched samples showed a single sharp peak (alpha crystal form) at 84.2 ppm (relative to glycine) and a broader resonance at 87.2 ppm. Relaxation experiments were conducted to determine T1N, T1H, and T1p for each sample at 300K. The crystalline resonance was found to have T1n's of 125-416s, consistent with crystalling nylon 6. The downfield peak has two measurable T1N's: a short component with T1 of 1-3s and a second component with a longer T1 of 19-29s. Nylon.

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1989
Accession Number
ADA208508

Entities

People

  • Douglas G. Powell
  • Lon J. Mathias

Organizations

  • University of Southern Mississippi

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Alcohols
  • Chemical Shifts
  • Chemical Synthesis
  • Chemistry
  • Cross Polarization
  • Crystal Structure
  • Diffusion
  • Elements
  • Materials
  • Measurement
  • Military Research
  • Plasticizers
  • Polymerization
  • Relaxation Time
  • Resonance
  • Spectra

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Organic Chemistry