The change in major constituents of raw coconut fibres, due to backwater and chemical retting is given in Table 2. The chemically retted fibre shows considerably higher -cellulose (54.2%) than both backwater retted (39.6%) and raw (38.4%) coconut fibre. The increase in cellulosic content is also evident in FTIR and XRD of chemically retted fibres. Chemical treatment resulted in reduction of lignin content of raw coconut fibre from 31.8 to 26.3%. The reduction of lignin content possibly decreases the flexural rigidity of the fibre up to a certain extent. The analysis also reveals notable reduction in other constituents of the fibre like hemicelluloses, pectin, fats and waxes, and ash content due to chemical treatment. The removal of constituents other than cellulose (viz., lignin, hemicelluloses, pectin, fats and waxes), which are not contributing towards the tensile parameters probably cause much better mechanical properties in terms of higher breaking tenacity, and work of rupture in chemically retted fibre. The trend of removal of constituents like, hemicelluloses, pectin and fat and wax matters is also evident in backwater retting, but the extent of removal is trivial.
The change in major constituents of raw coconut fibres, due to backwater and chemical retting is given in Table 2. The chemically retted fibre shows considerably higher -cellulose (54.2%) than both backwater retted (39.6%) and raw (38.4%) coconut fibre. The increase in cellulosic content is also evident in FTIR and XRD of chemically retted fibres. Chemical treatment resulted in reduction of lignin content of raw coconut fibre from 31.8 to 26.3%. The reduction of lignin content possibly decreases the flexural rigidity of the fibre up to a certain extent. The analysis also reveals notable reduction in other constituents of the fibre like hemicelluloses, pectin, fats and waxes, and ash content due to chemical treatment. The removal of constituents other than cellulose (viz., lignin, hemicelluloses, pectin, fats and waxes), which are not contributing towards the tensile parameters probably cause much better mechanical properties in terms of higher breaking tenacity, and work of rupture in chemically retted fibre. The trend of removal of constituents like, hemicelluloses, pectin and fat and wax matters is also evident in backwater retting, but the extent of removal is trivial.
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