Accession Number : AD0282802

Title :   GLASS SURFACE CHEMISTRY FOR GLASS FIBER REINFORCED PLASTICS

Corporate Author : SMITH (A O) CORP MILWAUKEE WIS

Report Date : 15 AUG 1962

Pagination or Media Count : 1

Abstract : Study continued of the glass surface chemistry for glass fiber reinforced plastics. In evaluating different glass surfaces by the flat plate test, all types of surfaces not treated with a coupling agent failed within 24 hr. The alkalideficient surface under the same condition has lasted a remarkable 37 days and failure has not been encountered. In preparing the alkali-deficient surface, the glass was etched to remove the alkali. The glass surface was thus not as smooth as other types of glass surfaces. Whether the longer bond life was due to chemical (removal of alkali and formation of a silica-rich film) or mechanical (roughness) bonding is not yet known. In order to determine whether failure in the flat plate specimens was due to water proceeding along the edges or through the resin, experiments were conducted by using a water column that subjected only the central portion of the resin surface to the 190 F water. The interesting result was that the flat plate specimen subjected to the water column failed as rapidly as the specimen entirely immersed in water. Since each component (glass, interface, and resin) contribute a different tensile force to the measured tensile force, reproducibility will be considerably improved when the type of failure is considered in calculating the stress. (Author)

Descriptors :   *LAMINATES, *REINFORCING MATERIALS, ADHESION, ALKALI METAL COMPOUNDS, BONDING, FAILURE (MECHANICS), PLASTICS, SURFACE ACTIVE SUBSTANCES, SURFACE PROPERTIES, TENSILE PROPERTIES, TEST METHODS, TESTS, WATER

Distribution Statement : APPROVED FOR PUBLIC RELEASE