Cure kinetics of PF/PVAc hybrid adhesive for manufacturing profiled wood-strand composites
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Yi Wang
Abstract
In thermoforming of profiled wood-strand composites, an adhesive system is needed to provide a weak initial bond to maintain mat integrity and architecture during the forming process and eventually a durable bond when the final cross-sectional shape is achieved. A hybrid adhesive composed of phenol formaldehyde (PF) and poly(vinyl acetate) (PVAc) is proposed in this study. The cure kinetics of this hybrid adhesive and bond development in a multi-step hot-pressing is discussed. Cure kinetics studied by differential scanning calorimetry indicated that adding PVAc slowed down the curing reaction of PF resin; however, the full cure of PF was not inhibited. The nth-order Borchardt Daniels (nth-BD) model provided good prediction for the curing of adhesives with a PF/PVAc ratio lower than 1:1. To simulate roll forming of wood-strand mats, a hot-pressing schedule at low temperature combined with multi-stage closing and opening was developed. The nth-BD model was able to predict the actual bond development for composites made with neat PF resin. The results indicated that cure kinetics of a PF/PVAc hybrid adhesive would not significantly differ from neat PF resin for blend ratios of 1:1 or lower, thus potentially providing a resin system for roll forming or matched-die forming of wood-strand composites.
©2010 by Walter de Gruyter Berlin New York
Articles in the same Issue
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- Side reactions of 4-acetamido-TEMPO as the catalyst in cellulose oxidation systems
- Reactions of aldehydes with chlorous acid and chlorite in chlorine dioxide bleaching
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- Moisture induced stresses perpendicular to the grain in glulam: Review and evaluation of the relative importance of models and parameters
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- A single cell model for pretreatment of wood by microwave explosion
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- Quantification of fungal colonization in modified wood: Quantitative real-time PCR as a tool for studies on Trametes versicolor
- Copper monoethanolamine adsorption in wood and its relation with cation exchange capacity (CEC)
- Effect of amine ligand, copper/amine ratio, and pH on copper adsorption into wood
- Effect of different soils and pH amendments on brown-rot decay activity in a soil block test
- A proposed accelerated field stake test for rapid assessment of wood preservative systems
- Meetings
- Meetings
Articles in the same Issue
- Original papers
- Side reactions of 4-acetamido-TEMPO as the catalyst in cellulose oxidation systems
- Reactions of aldehydes with chlorous acid and chlorite in chlorine dioxide bleaching
- Using cationic polyvinyl alcohol (C-PVA) to improve the strength of wood-free papers containing high-yield pulp (HYP)
- A new phenolic glucoside and flavonoids from the bark of Eucommia ulmoides Oliv.
- Decomposition of a phenolic lignin model compound over organic N-bases in an ionic liquid
- Investigation on wax-impregnated wood. Part 1: Microscopic observations and 2D X-ray imaging of distinct wax types
- Investigation on wax-impregnated wood. Part 2: Study of void spaces filled with air by He pycnometry, Hg intrusion porosimetry, and 3D X-ray imaging
- Surface properties of eucalyptus pulp fibres as reinforcement of cement-based composites
- Cure kinetics of PF/PVAc hybrid adhesive for manufacturing profiled wood-strand composites
- Moisture induced stresses perpendicular to the grain in glulam: Review and evaluation of the relative importance of models and parameters
- Three-dimensional modeling of the structure formation and consolidation of wood composites
- Observation of cell shapes in wood cross-sections during water adsorption by confocal laser-scanning microscopy (CLSM)
- A single cell model for pretreatment of wood by microwave explosion
- Pore space analysis of beech wood: The vessel network
- Quantification of fungal colonization in modified wood: Quantitative real-time PCR as a tool for studies on Trametes versicolor
- Copper monoethanolamine adsorption in wood and its relation with cation exchange capacity (CEC)
- Effect of amine ligand, copper/amine ratio, and pH on copper adsorption into wood
- Effect of different soils and pH amendments on brown-rot decay activity in a soil block test
- A proposed accelerated field stake test for rapid assessment of wood preservative systems
- Meetings
- Meetings
