Accession Number : AD0283752

Title :   CONCERNING THE NATURE OF STRENGTH OF POLYMERS

Corporate Author : PICATINNY ARSENAL DOVER N J

Personal Author(s) : BARTENEV,G.M. ; GUL,V. YE.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : Polymer rupture represents a process which develops over a period of time. Two stages of rupture are: a slow one, which is characterized with growth in the 'slight tears' in the oriented polymeric material, and a fast one, which is characterized by a growth of 'cracks' and which may take place in a non-oriented material. The structure of elastomers at the site of the growth of the 'slight tear' differs from the structure of the sample as a whole. This difference may be characterized by the degree of additional orientation in the place of growth of the 'slight tear.' The degree of additional elongation determines the strength of polymers. When the action of certain factors (decrease in temperature, increase in rate of deformation) changes the value of this additional elongation to a great extent, this change may be accompanied by an anomaly of the mechanism of strength. As a result of changes in temperature or rate of deformation, it is possible to accomplish the rupture of polymers by different mechanisms, each of which is characterized by specific regularities of strength. (Author)

Descriptors :   *POLYMERS, ACRYLIC RESINS, BIBLIOGRAPHIES, BUTADIENES, DEFORMATION, ELASTIC PROPERTIES, ELASTOMERS, ETHYLENES, MATERIALS, METHYL RADICALS, PHTHALATES, PLASTICS, RUBBER, STRESSES, STYRENES, TEMPERATURE, TENSILE PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE