Date on Master's Thesis/Doctoral Dissertation

1949

Document Type

Master's Thesis

Degree Name

M. Eng.

Department

Chemical Engineering

Committee Chair

Ernst, R. C.

Committee Co-Chair (if applicable)

Williams, G. C.

Committee Member

Williams, G. C.

Committee Member

Barnes, W. R.

Subject

Plywood--Testing; Adhesives

Abstract

This thesis is primarily a study of two-step plywood adhesives made with varying amounts of phenol, 1, 3, 5 xylenol, resorcin, and formaldehyde. Each resin was evaluated by using it as the adhesive in making plywood. The plywood was then tested for shear strength and wood failure after a four hour boil.

Procedures are given for making and testing various straight phenolic resins and resins modified with 1, 3, 5 xylenol or resorcin, or comibinations of both of these accelerating resins.

The straight phenolic resins gave boil-proof bonds, but the curing cycle was too long. Those phenolics modified with 1, 3, 5 xylenol gave relatively short cures, but large quantities of this modifier were necessary. Modification of phenolic resins with resorcin gave very rapid cures, but the pot life of these resins was too short. The best compromise was obtained with a combination of 1, 3, 5 xylenol and resorcin as modifying agents for the phenolic. Some of these three-component resin adhesives had sufficient pot life and produced boil-proof bonds during short curing cycles.

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