Study of the thermal behavior of alkali‐treated jute fibers

Abstract

Jute fibers were treated with 5% NaOH solution for 2, 4, 6, and 8 h to study the performance of the fibers as a reinforcing material in the composites. Thermal analysis of the fibers was done by the DTG and DSC technique. The moisture desorption was observed at a lower temperature in the case of all the treated fibers, which might be a result of the increased fineness of the fibers, which provides more surface area for moisture evaporation. The decrease in percentage moisture loss for the fibers treated with alkali for 6 and 8 h could be the result of the increased crystallinity of the fibers. The percentage degradation of the hemicellulose decreased considerably in all the treated fibers, conforming to the fact that the hemicellulose content was lowered on alkali treatment. The decomposition temperature for ␣-cellulose was lowered to 348°C from 362.2°C for all the treated fibers, and the residual char formation increased to a significant extent. The enthalpy for the thermal degradation of ␣-cellulose showed a decreasing trend for the fibers treated for 2 and 4 h, which could be caused by the initial loosening of the structure, followed by an increase in the enthalpy value in the case of the 6-and 8-h-alkali-treated fibers resulting from increased crystallinity, as evident from the X-ray diffraction.

Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 °C

“…The first transition occurs from 50 to about 250 , with the release of absorbed ℃ ℃ moisture from the fibre by evaporation. In this stage, the weight loss of cotton fibres is roughly similar to that of other natural fibres such as kenaf, jute and wood [37][38][39]. The second transition occurs between 250…”

Effect of Mercerization on the Properties of Pandanus Odorifer Lignocellulosic Fibre

“…This might be due to the removal of amorphous hemicelluloses from the fibres by alkali-treatment. Mercerization reduced the hemicellulose to a considerable extent, giving rise to lignin-cellulose complex, thereby making the product more stable than the untreated sample, and this reflected in the increased amount of residual char [33,34]. The thermal stability of the fibres treated with 20% alkali concentration decreased as compared to that of 15% alkali treated fibres.…”

Impact of Various pH Levels on 4-Methyl Catechol Treatment of Wood

“…This difference was due to the increasing pH for the 4-methyl catechol solution, which led to the formation of the lignin-cellulose complex (Ray et al 2002). The residual weight of TW at pH 8 was lower than raw wood due to the presence of unstable cyclic diene in polymerized 4-methyl catechol.…”