The manufacturing of fiberboard from wood fiber with the help of adhesive is highly developed and widely commercialized technique. However, with an increasing concern over health issues and biomass conservation, the fiberboards from agriculture residues with or without using adhesives are under intensive investigation. In last three decades, several researches have been done various methods and technique dealing the development of binderless fiber boards such as wet process and dry process. This review article also covered pretreatments of fiber which helps to find out optimum criteria for fabrication of fibreboards. Fibre sizes in fibreboard were studied and found that the dimensions of fibres effect the physical, mechanical and thermal properties. The pressing time and temperature influence the internal bonding of binderless fibreboards. The mechanical and thermal properties of binderless fibresboard were discussed on various pressing time and temperature and compared with different type fibreboards. Effect of hygrothermal properties on the physical, mechanical and thermal behavior of binderless were also discussed. This review summarized various aspects of self-bonding mechanism in binderless fibresboard with a focus on agriculture residues based raw materials. Various aspects of binderless fiberboard manufacturing such as raw material suitability, effects of pretreatments and manufacturing process on physical, mechanical and thermal properties are discussed. The chemical changes in fiber during pretreatments and hot pressing is also discussed in detail. These binderless fiberboard showed the suitability in use for indoor applications due to its non-toxic characteristics.
WeatheringSurface degradation H even braxiliensix Di1Tu.se reflectance Fourier transform infrared (DRIFT) spectra Chromium trioxide Photodegradation
SummitrySamples of Hcvca hrasiliensis (Rubber wood) treated with dilute aqueous solution of chromium trioxidc along with untreated specimens were exposed to artificially generated weathering conditions, Results show u severe deterioration of wood surfaces in untreated specimens which is mainly due to loss of lignin. 1R spectroscopic analysis indicated an increase in the concentration of carbonyl chromophoric functional groups in exposed wood surfaces, whereas aromatic functional groups due to lignin decreased with irradiating time. Treatment of wood with an aqueous solution of chromium trioxide was found to restrict surface deterioration remarkably. DRIFT spectra obtained from exposed wood surfaces provide direct evidence of modification and stabilisation of lignin due to formation of a photo-stable complex in treated samples.
Clustering behavior of water molecules during adsorption of water in wood was studied using the Zimm-Lundberg theory. The average cluster size of water molecules was determined with the help of wood adsorption isotherms at five temperatures. The effects of both relative humidity and temperature on average cluster size were studied. Average cluster size progressively increased with an increase in humidity. At humidities corresponding to fiber saturation, larger clusters were formed. Cluster size increased sharply with an increase in temperature at humidities close to saturation. Formation of large clusters at high temperature and humidities close to saturation is attributed to increased fraction of weakly bonded water and capillary condensation in such conditions. A description of adsorption of water in wood was provided in terms of average cluster size.
Comparative studies of the moisture adsorption behaviour of undecayed and brown rot decayed wood blocks of Pinus sylvestris were made. Experimental adsorption isotherms were obtained. Analysis of adsorption data in terms of primary and secondary water were carried out using the theory of Brunauer, Emmett and Teller (BET). A good agreement between experimentally obtained adsorption isotherms with those obtained using BET theory, validating the use of BET theory in the elucidation of adsorption mechanism.
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