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Rajput G.,DAV PG College | Pandey I.P.,DAV PG College | Joshi G.,Forest Research Institute | Bisht S.S.,Institute of Wood Science & Technology
Journal of the Indian Academy of Wood Science | Year: 2015

The Cassia angustifolia seed gum (CAG) was isolated from the seeds of C. angustifolia and subjected to cyanoethylation by using acrylonitrile (AN) in presence of alkali (NaOH) in aqueous medium at different reaction conditions. The variables studied is comprised of alkali concentration, AN concentration, liquor:gum ratio as well as reaction temperature and time. The nitrogen content (%N), degree of substitution (DS) and reaction efficiency (RE) were determined. The optimum conditions for preparing cyanoethyl-CAG (%N = 6.36 %; DS = 0.969) comprised 0.100 mol of NaOH, 0.075 mol of acrylonitrile and liquor:gum ratio (v/w) of 10:1 at 45 °C for 60 min using 0.03 mol (as AGU, anhydroglucose unit) of CAG. RE was found to be 24.08 % under these conditions. Rheological studies of 1 and 2 % (w/v) cyanoethyl-CAG showed non-Newtonian pseudoplastic behaviour, relatively high viscosity, cold water solubility, solution stability and clarity as compared to the solutions of unmodified CAG. © 2015, Indian Academy of Wood Science. Source


Aggarwal P.K.,Institute of Wood Science & Technology | Raghu N.,Institute of Wood Science & Technology | Kale A.,Institute of Wood Science & Technology | Vani C.N.,Institute of Wood Science & Technology | Chauhan S.,Institute of Wood Science & Technology
Journal of the Indian Academy of Wood Science | Year: 2015

Hydrophilic nature of ligno-cellulosic fibers can affect dimensional stability and interfacial bond strength of wood polymer composites. In this paper, moisture adsorption and absorption behaviour of bio-fiber filled high density polyethylene composites has been reported. Composites were prepared with wood pulp and bamboo flour at varying filler concentration and subjected to moisture adsorption and absorption. The magnitude of moisture absorption and adsorption increased with increasing filler content. Moisture adsorption in wood fiber based composites was higher than bamboo flour but there was no significant difference in their water absorption behaviour. Use of coupling agent exhibited a significant influence on the magnitude of water absorption by the composites. Composites with coupling agent absorbed 25–40 % less moisture as compared to the composites without coupling agent in both filler types. Moisture absorption behaviour in the composites was explained based on the theoretical Fickcian diffusion model. © 2015, Indian Academy of Wood Science. Source

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