GLASS SURFACE CHEMISTRY FOR GLASS FIBER REINFORCED PLASTICS
Abstract
The results of wetting studies to voids in laminates are presented. A likely origin of gas voids in laminates is the air bubbles entrained during application of resin to the glass fibers. Results showed there was more probability of trapping air bubbles on the A-1100 treated E glass surface in epoxy resin than on the chemically cleaned surface. The A-1100 treated glass surface was known to be more poorly wet by water and epoxy resin. It is probable that the void content of a laminate might be reduced by more complete wetting of the glass surface by the resin. Further investigations of mode of failure in the flat plate test indicated that 190 F water permeated through resin and along the glass-resin interface at equal rates. Both mechanisms removed resin coatings from untreated chemically cleaned glass surfaces in 15 hours or less. The problem of poor reproducibility in bond strength measurements was partly solved by changing the alignment fixture. The specimens were being stressed prior to testing. The question of location of failure when mirror interfaces result was partly answered by captive bubble measurements. The failed bond areas exhibited marked non-wetting by water, thereby indicating resin was left on the glass surface. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1962
- Accession Number
- AD0284868