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Synthesis and properties of resol-type phenol-formaldehyde resins prepared from H2SO4- and HCl-catalyzed phenol-liquefied Cryptomeria japonica wood
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Wen-Jau Lee
,
Chen-Ling Kang
Published/Copyright:
July 19, 2011
Abstract
Wood of Cryptomeria japonica (Japanese cedar) was liquefied in phenol with H2SO4 or HCl as catalysts and used as raw materials to prepare phenol-formaldehyde (PF) resins. The curing behavior and adhesion properties of resins prepared were investigated. Wood liquefied with H2SO4 as a catalyst had better liquefaction effect than that with HCl; however, the reaction of resin synthesis was hard to control due to its quickly increasing viscosity. Differential scanning calorimetry analysis shows that PF resins prepared from HCl-catalyzed liquefied wood had higher reactivity than those of H2SO4-catalyzed wood. These PF resins were employed for manufacturing three-layer plywood. The wet bonding strength of plywood prepared with resins from HCl-catalyzed liquefied wood exceeded 0.7 MPa and fulfilled the requirement of the CNS 1349 standard.
Keywords: Cryptomeria japonica; curing behavior; differential scanning calorimetry (DSC); phenol-formaldehyde resins; phenol-liquefied wood; plywood
Received: 2010-11-16
Accepted: 2011-6-11
Published Online: 2011-07-19
Published in Print: 2012-01-01
©2012 by Walter de Gruyter Berlin Boston
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Keywords for this article
Cryptomeria japonica;
curing behavior;
differential scanning calorimetry (DSC);
phenol-formaldehyde resins;
phenol-liquefied wood;
plywood
Articles in the same Issue
- Original Papers
- Novel paper sizing agents based on renewables. Part 5: characterization of maleated oleates by ozonolysis
- Polythiophene-cellulose composites: synthesis, optical properties and homogeneous oxidative co-polymerization
- The influence of extended mercerization on some properties of carboxymethyl cellulose (CMC)
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- A rheological description of the water vapour sorption kinetics behaviour of wood invoking a model using a canonical assembly of Kelvin-Voigt elements and a possible link with sorption hysteresis
- Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment
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