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|標題:||Synthesis and properties of resol-type phenol-formaldehyde resins prepared from H2SO4- and HCl-catalyzed phenol-liquefied Cryptomeria japonica wood||作者:||Lee, W.J.
|關鍵字:||Cryptomeria japonica;curing behavior;differential scanning calorimetry;(DSC);phenol-formaldehyde resins;phenol-liquefied wood;plywood;oil-pf resols;lignin model-compound;liquefaction mechanism;acid;catalysis;cocondensed resin;corn bran;cell-wall;part 1;bark;moldings||Project:||Holzforschung||期刊/報告no：:||Holzforschung, Volume 66, Issue 1, Page(s) 67-72.||摘要:||
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.
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