Accession Number : ADA119075

Title :   Stress Related Surface Tension Effects in Hard Elastic Polymers.

Descriptive Note : Interim technical rept.,

Corporate Author : CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s) : Walton,Kim ; Moet,Adelsamie ; Baer,Eric

PDF Url : ADA119075

Report Date : 19 Aug 1982

Pagination or Media Count : 41

Abstract : Stress depressions of hard elastic polypropylene, hard elastic high impact polystyrene, and Gore-Tex, A nonelastic, porous, Teflon material were measured when these polymers, under load, were subjected to changes in their environment from air to various nonswelling liquids. The stress depressions were studied as a function of liquid surface tension and viscosity and the strain imposed on the materials. Results indicate that these microfibrillated polymers contain a substantial surface energy component in their stress which is independent of strain at high tension. This surface energy component is apparently inversely proportional to the average microfibril diameter. It suggested that a maximum fibril diameter limiter exists such that, above this limit, hard elastic behavior will not occur. (Author)

Descriptors :   *Polymers, *Elastic properties, *Composite structures, Hardness, Stress strain relations, Tension, Viscosity, Crystallization, Liquids, Surface energy, Porosity, Modulus of elasticity, Morphology, Mechanical properties, Physical properties, Polypropylene, Tetrafluoroethylene resins

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE