Nitrogen 15 T(1) Measurements of Semicrystalline Nylon 6

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 84.2ppm (relative to glycine) and a broader resonance at 87.2 ppm. Relaxation experiments were conducted to determine the spin lattice relaxation time T1N for each sample at 300K. The crystalline resonance was found to have T1N's of 125-416s, consistent with a rigid, crystalline component. The downfield peak (87.2 ppm) had 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
ADA208481

Entities

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  • Douglas G. Powell
  • Lon J. Mathias

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  • University of Southern Mississippi

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  • Energy and Power Technologies

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  • Materials science

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