Copper compounds for durable composites : effects on material properties Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ft848s866

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  • The effects of incorporation of selected biocides on physical and mechanical properties of aspen strandboard were assessed using five copper-based preservatives or zinc borate at three retention levels. Tebuconazole or 4,5-dichloro-2-N-octyl-4-isothiazolin-3-one (DCOI) were added as co-biocides to selective copper-based treatments. Mold box tests showed that only panels treated with DCOI provided significant protection against mold growth, and DCOI with a copper-based preservative provided the best protection. Exposure to brown or white rot fungi in a laboratory soil block test showed that all preservatives except micronized copper hydroxide or DCOI alone reduced weight losses below 10 %. The other three copper-based preservatives performed well independently. The addition of DCOI or tebuconazole markedly improved mold resistance. No reductions in bending strength or stiffness were associated with biocide addition. Internal bond strengths in panels treated with the liquid copper-based preservative were significantly lower than the untreated controls. Preservative addition was associated with increased thickness swelling compared to the untreated controls, but this effect was slight. Some treated panels also experienced slight increases in the rate of linear expansion, but the values all were well below the maximum accepted thickness swelling value. Some preservatives were slightly prone to chemical leaching, but two copper-based biocides were highly resistant. The results indicate that the three copper-based preservative systems increased resistance to decay fungi without adversely affecting mechanical or physical properties. Further field studies to assess resistance to fungal and insect attack are underway.
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