Novel woodceramics were successfully fabricated by enzymatic hydrolysis lignin （EHL） modified phenol-formaldehyde resin and woodpowders. The microstructure of woodceramics was investigated by FT-IR, X-ray diffracti...Novel woodceramics were successfully fabricated by enzymatic hydrolysis lignin （EHL） modified phenol-formaldehyde resin and woodpowders. The microstructure of woodceramics was investigated by FT-IR, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The effects of EHL-modified PF resin on the properties of woodceramics, such as the weight loss ratio, volume shrinkage ratio, open porosity, bending strength and compressive strength, were studied. The experimental results showed that EHL modified woodceramics had a uniform porous structure. EHL-modified PF resin played an important role in the properties of woodceramics. With the increase of EHL-modified PF resin content, the open porosity, weight loss ratio and volume shrinkage ratio of woodceramics increased, but the bending strength and compressive strength decreased.展开更多
The international issue to be addressed towards realizing a low-carbon society is to reduce the amount of carbon-based underground reserves such as coal, petroleum, and coke, and strongly encouraged to use carbon neut...The international issue to be addressed towards realizing a low-carbon society is to reduce the amount of carbon-based underground reserves such as coal, petroleum, and coke, and strongly encouraged to use carbon neutral biomass-derived resources. Woodceramics is a hybrid porous carbon material composed of wood-based biomass and phenolic resin, characterized by high far-infrared emissivity and large specific surface area. Woodceramics has been studied as heating elements and humidity and gas sensors, etc. If this is applied to the inner walls of aging and grain drying furnaces for vegetables and fruits, both ripening and drying are greatly promoted and fossil fuels used in boilers can be significantly reduced. In fact, it can produce black garlic with far infrared rays using a woodceramics brick efficiently. Furthermore, as a substitute for phenolic resin, if plant-based liquefied materials from cashew nut shell oil can be prepared and can be used for manufacturing woodceramics, then all carbon neutral circulating woodceramics made from wood-based biomass is possible to manufacture. On the other hand, woodplastics is a composite material that can be made of wooden materials and plastics, and able to expect the effective use of wood-based biomass and waste plastics.展开更多
Hydrogen adsorption characteristics of woodceramics,made from radiata pine wood fiber boards carbonized at 1 473 K after impregnation with phenolic resin,with and without chemical treatment in an alkaline(KOH) or an a...Hydrogen adsorption characteristics of woodceramics,made from radiata pine wood fiber boards carbonized at 1 473 K after impregnation with phenolic resin,with and without chemical treatment in an alkaline(KOH) or an acid(H 2 SO 4) solution were investigated The hydrogen adsorption capacity is improved by chemical treatment.The chemical treatment by KOH improves the adsorption capacity more than by H 2 SO 4.The improvement of the capacity level,in any solution,is dependent on the type of chemical in the solution and its concentration.The maximum hydrogen capacity measured at 93 K is mass fraction about w(H) = 2% for the woodceramics after chemical treatment in a volume fraction = 50% KOH solution,although that is about w(H) = 0.7% for one without chemical treatment.The microscopic condition of pores in the woodceramics is thought to vary after chemical treatment.展开更多
基金Funded by the Foundation for Development of Science and Technology of Fuzhou University (No.2012-XQ-1)the Technical Project of Education Bureau of Fujian Province,China(No.JA09019)
文摘Novel woodceramics were successfully fabricated by enzymatic hydrolysis lignin （EHL） modified phenol-formaldehyde resin and woodpowders. The microstructure of woodceramics was investigated by FT-IR, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The effects of EHL-modified PF resin on the properties of woodceramics, such as the weight loss ratio, volume shrinkage ratio, open porosity, bending strength and compressive strength, were studied. The experimental results showed that EHL modified woodceramics had a uniform porous structure. EHL-modified PF resin played an important role in the properties of woodceramics. With the increase of EHL-modified PF resin content, the open porosity, weight loss ratio and volume shrinkage ratio of woodceramics increased, but the bending strength and compressive strength decreased.
文摘The international issue to be addressed towards realizing a low-carbon society is to reduce the amount of carbon-based underground reserves such as coal, petroleum, and coke, and strongly encouraged to use carbon neutral biomass-derived resources. Woodceramics is a hybrid porous carbon material composed of wood-based biomass and phenolic resin, characterized by high far-infrared emissivity and large specific surface area. Woodceramics has been studied as heating elements and humidity and gas sensors, etc. If this is applied to the inner walls of aging and grain drying furnaces for vegetables and fruits, both ripening and drying are greatly promoted and fossil fuels used in boilers can be significantly reduced. In fact, it can produce black garlic with far infrared rays using a woodceramics brick efficiently. Furthermore, as a substitute for phenolic resin, if plant-based liquefied materials from cashew nut shell oil can be prepared and can be used for manufacturing woodceramics, then all carbon neutral circulating woodceramics made from wood-based biomass is possible to manufacture. On the other hand, woodplastics is a composite material that can be made of wooden materials and plastics, and able to expect the effective use of wood-based biomass and waste plastics.
文摘Hydrogen adsorption characteristics of woodceramics,made from radiata pine wood fiber boards carbonized at 1 473 K after impregnation with phenolic resin,with and without chemical treatment in an alkaline(KOH) or an acid(H 2 SO 4) solution were investigated The hydrogen adsorption capacity is improved by chemical treatment.The chemical treatment by KOH improves the adsorption capacity more than by H 2 SO 4.The improvement of the capacity level,in any solution,is dependent on the type of chemical in the solution and its concentration.The maximum hydrogen capacity measured at 93 K is mass fraction about w(H) = 2% for the woodceramics after chemical treatment in a volume fraction = 50% KOH solution,although that is about w(H) = 0.7% for one without chemical treatment.The microscopic condition of pores in the woodceramics is thought to vary after chemical treatment.
