Accession Number : AD0629899

Title :   INTERFACIAL INTERACTION IN COMPOSITE STRUCTURES.

Descriptive Note : Final rept., 19 Feb 65-18 Feb 66,

Corporate Author : ALPHA RESEARCH AND DEVELOPMENT INC BLUE ISLAND ILL

Personal Author(s) : Patrick,Robert L. ; Layne,William S.

Report Date : 18 FEB 1966

Pagination or Media Count : 54

Abstract : Glass rod is believed to lose much of its strength as a result of interaction with minute amounts of water. To test this theory, an anhydrous cell was fabricated in which a water vapor content of less than 5 ppm. Rods treated with water lost much of their strength. Experiments were continued to determine the efficacy of removal of tritiated water from glass surfaces with distilling solvents. Water was continuously removed from the solvent with calcium hydride. Results to date indicate that water is removed very slowly and incompletely by this method. In order to examine the path of diffusion through solid epoxy or the glass-epoxy interface, cells were fabricated from DER 332/DMP 30, and were filled with water. Losses of water were measured gravimetrically. Results indicate that if diffusion is the sole source of weight loss, that losses are not greater than 0.0000003 gram/day/sq. mm. If the diffusion is along the glass epoxy interface, it is not greater than 0.6 mm/sec. Studies of E-glass rods which had been dehydrated by roasting at 500C followed by treatment with tritiated water was found to bind tritium tightly to the surface. After initial drying, the residual tritium was reduced to about half after four hours additional drying. (Author)

Descriptors :   (*COMPOSITE MATERIALS, SURFACE PROPERTIES), (*GLASS, TENSILE PROPERTIES), RODS, DEHYDRATION, TRITIUM, DIFFUSION, HYDRATES, EPOXY RESINS

Subject Categories : Physical Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE