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• W1968832022 abstract "Purpose The purpose of this paper is to describe the development of an eco‐friendly tannin‐phenol formaldehyde resin (PFT) applicable in the wood composite industry. Design/methodology/approach The bark of oak ( Quercus castaneifolia ) contains a large amount of condensed tannin. Condensed tannin, with a large amount of Catechol groups was considered for reducing the formaldehyde emission level on the adhesive system. Physical characteristics of synthesized PFT resin were evaluated. Findings For optimal extraction, three solvents were used in the extraction process. The results showed that a mixture of water‐methanol (1:1 v/v) as extracting solvent is the best solvent and yields about 14 per cent tannin based on dry weight of bark. For producing tannin phenol formaldehyde adhesive, 10 per cent, 20 per cent and 30 per cent (based on PF dry weight) of PF, substituted with natural extracted tannin. For evaluating PFT performance effects of percentage amount of substitution tannin content on the gel time, viscosity, pH, and density of adhesives were evaluated. Based on emission test (JIS A 1460‐2001) formaldehyde emission of PFT 10 per cent, 20 per cent and 30 per cent were 1.13, 1.12 and 0.4 mg/100 g, which is very low compared with tannin‐free PF. Research limitations/implications Tannin‐PF adhesive compared to PF adhesive had lower PH, higher viscosity and shorter gel time. Practical implications The method developed provides a simple and excellent renewable resource “tannin” which can be used or partially substituted in phenol formaldehyde adhesive. Originality/value Results showed that replacing PF for tannin reduces modulus of rupture (MOR) and modulus of elasticity (MOE) slightly but has significant effects on IB, water absorption and thickness swelling." @default.
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• W1968832022 date "2012-09-07" @default.
• W1968832022 modified "2023-10-18" @default.
• W1968832022 title "Eco‐friendly tannin‐phenol formaldehyde resin for producing wood composites" @default.
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• W1968832022 doi "https://doi.org/10.1108/03699421211264857" @default.
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