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

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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 1H NMR technique known as CRAMPS Combined Rotation And Multiple Pulse Spectroscopy. This technique, combined with DSC and 13C CPMAS NMR, has allowed us to make tentative assignments for the molecular motions occurring at different temperatures below the melting point.

Author(s):
Stewart, Michael J. ; Mathias, Lon J.
Author Organization(s):
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
Descriptive Note:
Technical rept. 1 Jun 1993-31 May 1994
Pagination:
0003

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-71
Contract/Grant Number(s):
N00014-89-J-1225
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_1.3_Human Capital Management
Modernization Areas:
Directed Energy
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*ANGLES, *POLARIZATION, *NUCLEAR MAGNETIC RESONANCE, *SPECTROSCOPY, *CARBON, *PULSES, *HYDROCARBONS, *ORGANIC COMPOUNDS, *SPINNING(MOTION), *TRANSITIONS, *ROTATION, *SOLID STATE CHEMISTRY, *SOLID PHASES, TEMPERATURE, MOTION, ORGANIC MATERIALS, MOLECULAR PROPERTIES, MELTING POINT, POLYETHYLENE
Field(s)/Group(s):
Organic Chemistry, Physical Chemistry, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
*CRAMPS(COMBINED ROTATION AND MULTIPLE PULSE SPECTROSCOPY), *CP(CROSS POLARIZATION), *MAS(MAGIC ANGLE SPINNING), *N HEXATRIACONTANE, *HEXTRAIACONTANE, MAGIC ANGLE SPINNING, PARAFFINS
Report Date:
1994 Jul 15