Accession Number : AD0721025

Title :   Dependence of the Viscosity of Polytetrafluoroethylene on Temperature,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Samoilova,A. Ya.

Report Date : 11 DEC 1970

Pagination or Media Count : 8

Abstract : From the plots of given temps in 0.2-1.0 Hz range the relaxation activation energies (H) were obtained for Ftoroplast-4 (Polytetrafluoroethylene) (I) and K-21-22 (Phenol-formaldehyde, resin, filled with food flour) (II). For I,H equals 6.5 kcal/mole; and for II, samples of different crystallinities H ranged from 3.2 to 9.9 kcal/mole, supporting the view (D. D. Chegodaev, 1960) that 1 polymer molecule may extend over amorphous and crystal regions. The energy of group vibrations around C-C bonds in I ranged from 3.6 to 5.3 kcal/mole, while the energy of intermol. attraction in I was 2 kcal/mole. (Author)

Descriptors :   (*HALOCARBON PLASTICS, VISCOSITY), RELAXATION TIME, FLUORINE COMPOUNDS, COMPOSITE MATERIALS, FLOUR, HEAT OF ACTIVATION, TEMPERATURE, USSR

Subject Categories : Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE