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Effect of Alkyl Substitution on Some Physical Properties of Jute and Cotton Fibres

M.A . Rahman
Department of Chemistry Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

A.K. Sarker
Department of Chemistry Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

The degree of alkyl substitution and its effect on per cent elongation, bundle strength and moisture regain of etherified jute and cotton fibers pretreated with 20% NaOH were studied. The results so obtained indicate that the degree of substitution increases with the increase of reaction time. The per cent elongation of alkyl substituted fibre is found better with low degree of substitution. Undecyl substituted fibres have better per cent elongation compared to others. The bundle strength of substituted jute decreases while that of cotton increases at 1-2 hour reaction time. The jute fibres substituted with higher alkyl radical are more water repellent.

Keywords: Per cent elongation, Bundle strength, Moisture regain

Location: Agricultural Farm, Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Cotton, Jute

Objectives:

To study some physical properties of alkyl substituted fibres

Methodology:

Jute fibre (Corchorus olitorius) was collected from Agricultural Farm, Bangladesh Agricultural University, Mymensingh. After discarding the bottom portion ( 12 em) the rest of the fibre was cut into pieces (6 em). It was cleaned manually and dried in the sun.Cotton cellulose (Vatros cotton) was supplied by Bangladesh Jute Research Institute (BJRI)Dhaka. It was cleaned manually and sun dried. Hexyl chloride (CH6 cl), heptyl chloride 13C7H15CI). nonyl chloride (CgH1gCI) and undecyl chloride (C H11 23cl) were prepared·rom their respective alcohols by using thionyl chloride Vogel .Alkali fibre was prepared separately by immersing the jute/c otton fibres in solution of 20% NaOH (W/V) and allowe:d to ripen for 3 hours. Excess of alkali was removed by squeezing so that the weight of alkali fibre was 3 times of the weight of jute/cotton fibres. The alkali fibres were then etherified with n-hexyl, n-heptyl, n-nonyl and n-undecyl chlorides separately at 30°C for different time hours (lorand and Georgi, The degree of substitution of etherified jute and cotton fibres was determined by Ziesel method . The degree of substitution was calculated from the formula according to Croon and Manely ..

Source of Information: Bangladesh J. Agril. Sci. 23(2): 1.19-124. July. 1996 ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Jute and cotton fibres pretreated with 20% NaOH were etherified and the degree of substitution, per cent elongation, bundle strength and moisture regain were studied. It is observed from the results that the degree of substitution increases with the increase of reaction time and the rate of reaction is faster in the initial period of the reaction and gradually decreases with the progress of the reaction, which is agreed with the previous results obtained .It is found that undecyl radical is substituted least to both jute and cotton fibres. It is also seen that jute fibre is more substituted than cotton fibre. This is due partly to greater non crystallinity in the jute af}d partly to the presence of other constituents like lignin and hemicellulose.

Knowledge Management: Journal