화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.15, No.6, 870-875, November, 2009
Synthesis of phenolic resol resins using cornstalk-derived bio-oil produced by direct liquefaction in hot-compressed phenol-water
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For the synthesis of biomass-based resol resins, cornstalk powders were liquefied in a hot-compressed phenol.water (1:4, wt./wt.) medium at 300-350 ℃. It was observed that essentially no phenol was reacted with the cornstalk degradation intermediates during the liquefaction process. The cornstalkderived bio-oils contained oligomers of phenol and substituted phenols, originated primarily from the lignin component of the cornstalk feedstock. Using the cornstalk-derived bio-oils, resol resins were readily synthesized under the catalysis of sodium hydroxide. The biomass-derived resol resins were brown viscous liquids, possessing broad molecular weight distributions. In comparison with those of a conventional phenol resol resin, the properties of the bio-based resins were characterized by GPC, FTIR, DSC and TGA. The as-synthesized bio-oil resol resin exhibited typical properties of a thermosetting phenol.formaldehyde resin, e.g., exothermic curing temperatures at about 150-160 ℃, and an acceptable residual carbon yield of ca 56% at 700 ℃ for the cured material.
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