A CRAMPS and 13C CP/MAS NMR Examination of Solid-Solid Transitions in n- Hexatriacontane (C36H74)

Abstract

The normal paraffins can undergo several transitions before melting and may thus serve as interesting model compounds for polyethylene, which also undergoes solid-solid transitions, the strongest and best-known being the so- called alpha transition. Our examination of n-Hexatriacontane (C36) has been greatly furthered by the use of the solid-state (1)H NMR technique known as CRAMPS (Combined Rotation And Multiple Pulse Spectroscopy). This technique, combined with DSC and (13)C CP/MAS NMR, has allowed us to make tentative assignments for the molecular motions occurring at different temperatures below the melting point.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1994
Accession Number
ADA282497

Entities

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  • Lon J. Mathias
  • Michael J. Stewart

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  • University of Southern Mississippi

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DTIC Thesaurus Topics

  • Chemical Shifts
  • Chemistry
  • Cross Polarization
  • Elements
  • Gas Bearings
  • Melting
  • Melting Point
  • Mississippi
  • Peak Values
  • Phase
  • Polymers
  • Resonance
  • Security
  • Shoulder
  • Spectra
  • Transitions
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