Graduate Thesis Or Dissertation
 

Determining appropriate accelerated aging tests for keruing plywood

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  • The main objective of this study was to determine appropriate accelerated aging methods for exterior plywood made with Southeast Asian hardwood face veneers. A secondary objective of this study was to determine the durability of exterior plywood made with keruing (12 Dipterocarpus spp.). To reach these objectives I made plywood using three phenolic adhesives in a split-split plot design, varying assembly time (5, 20, 45 minutes) and species (16 Southeast Asian hardwoods) through four replications. Samples from these panels were subjected to vacuum/ pressure soak (PS1-74); standard boil cycle (PS1-74) for 2, 5, 10, and 25 cycles; automatic boil cycle (ASTM D3434-75) for 20, 40, 100, and 200 cycles; weatherometer (ASTM G23-69) for 2400 hours; and wet/dry cycling for 2400 hours. For these hardwoods, both the standard and automatic boil cycle aging methods were good discriminators of bond durability. The standard boil method required 10 or more cycles to assure that unsatisfactory bonds would be detected. The automatic boil method required 40 or more cycles. The vacuum/pressure, weatherometer and wet/dry cycle methods were poor discriminators of bond durability. All keruings examined formed uniformly excellent bonds with a low molecular weight resin (adhesive B); they formed bonds of variable quality with a moderately high molecular weight resin (adhesive A).
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