Numéro
J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C10-499 - C10-506
DOI https://doi.org/10.1051/jphyscol:198510111
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 46 (1985) C10-499-C10-506

DOI: 10.1051/jphyscol:198510111

DEFECT DIFFUSION MODELS FOR INTERNAL FRICTION PROCESSES IN POLYETHYLENE

D.H. RENEKER and J. MAZUR

National Bureau of Standards, Gaithersburg, Maryland, 20899, U.S.A.


Abstract
Defect loops that encircle one chain in a polyethyene crystal are characterized in terms that are used to describe dislocation loops in metals. In a polyethylene crystal the defect loop which requires the least energy for creation belongs to the relatively unknown class of defects called dispirations. Dispirations can be thought of as defects in the helical symmetry of the polyethylene molecule in the crystal. The processes by which the diffusion of dispiration loops can contribute to relaxation processes in polyethylene are described.