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|標題:||Properties of Novolac-Type Phenol-Formaldehyde Resins Prepared from “Cryptomeria japonica” Liquefied with Phenol/Bisphenol A
|關鍵字:||Cryptomeria japonica;Liquefied wood;Molding plates;Novolac-type phenol-formaldehyde resins;柳杉;液化木材;成型板;Novolac型酚醛樹脂||Project:||林業研究季刊, Volume 37, Issue2, Page(s) 133-142.||摘要:||
In this study, wood powders of ＂Cryptomeria japonica＂ (Japanese cedar) were liquefied in phenol and the mixture of phenol/bisphenol A (6/4, wt/wt) with H2SO4 as a catalyst at 150oC for 60 min to obtain the liquefied wood of PLW and BLW, respectively. The fossil phenol, PLW and BLW were reacted with formaldehyde under acid condition to prepare three kinds of novolac resins, named PF, PLW-PF and BLW-PF. The results show that wood components could combine with liquefaction reagents to form derivatives. The PLW had lower average molecular weight and molecular weight dispersity than the BLW. All of these three novalac-type PF resins had the behavior of hot-melting. Among them, PF resin had lower melting point and less average molecular weight than others. Novalac-type PF resins without hardener showed an endothermic phenomenon during DSC heat scanning. However, an obvious exothermic peak due to crosslinking reaction appeared when hexamethylene tetramine was added. The phenomenon of thermal activity and thermal crosslinking were more obvious for PF resin than PLW-PF and BLW-PF. Molding plates made with the mixture of PF/BLW-PF resins that had the weight ratio of 100/0, 70/30 and 50/50, ＂Albizzia falcate＂ wood flour and hexamethylene tetramine had good dimensional stability. However, the internal bonding strength and bending strength of molding plates decreased with increasing the weight ratio of BLW-PF.
|Appears in Collections:||第37卷 第02期|
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