Accession Number : AD0688361

Title :   Q. M. TUNNELING AS A VISCOELASTIC RELAXATION MECHANISM.

Descriptive Note : Technical rept.,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC)

Personal Author(s) : Eisenberg,Adi ; Reich,Shimon

Report Date : 01 JUN 1969

Pagination or Media Count : 16

Abstract : It is proposed that quantum mechanical tunneling may be the viscoelastic relaxation mechanism for methyl group containing polymers at low temperatures. This proposal is based on the agreement of the tan sigma peaks at given frequencies with the tunneling frequencies for methyl groups of reasonable barrier heights at corresponding temperatures. The proposed mechanism, in conjunction with published frequency-barrier height correlations, allows the estimation of the barrier heights for a wide range of methyl groups from the knowledge of a single tan delta maximum. The barriers are in general agreement with those obtained by NMR techniques for similar materials. (Author)

Descriptors :   (*POLYMERS, VISCOELASTICITY), (*VISCOELASTICITY, TUNNELING(ELECTRONICS)), RELAXATION TIME, QUANTUM THEORY, NUCLEAR MAGNETIC RESONANCE, CRYOGENICS, ACRYLIC RESINS, POLYETHYLENE PLASTICS, CANADA

Subject Categories : Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE