Dyeing and thermal behavior of jute fibre grafted with nitrile monomer

Md Ibrahim H Mondal,Md Khademul Islam

doi:10.1186/s40691-015-0038-5

Abstract

AbstractModification of bleached jute fibre was carried out by graft co-polymerization with the vinyl monomers, acrylonitrile and methacrylonitrile. A K2S2O8/FeSO4redox system was used in the presence of air. The graft yield and grafting efficiency increased with the increase of monomer, initiator and reaction time up to certain values, thereafter it decreased. This is due to the increasing rate of homopolymerization, rather than grafting, at the higher monomer concentration. The maximum graft yield with acrylonitrile and methacrylonitrile, under optimized conditions, was 19.78 and 43.15%, respectively. The graft yield of methacrylonitrile is greater than that of acrylonitrile. This is due to the –CH3group present in methacrylonitrile. The inclusion of nitrile monomer onto the treated fibre was identified by Fourier Transform Infrared Spectroscopy. The surface morphology and thermal behavior of the modified fibre was investigated by Scanning Electron Microscopy and Thermogravimetric Analysis. Modification of jute fibre improved the thermal stability, breaking strength as well as dyeability of the fiber.

Highlights

Jute fibre is the most important cash crop and the biggest foreign exchange earner of Bangladesh
A lot of work has been reported on graft co-polymerization of vinyl monomers onto cellulosic and other textile fibre (Mondal 2013; Bakr et al 2015), much less has been reported on grafting of nitrile monomers onto jute fibre
The maximum graft yield was obtained when the bleached jute fibre was treated with 300% AN and 280% MAN

Summary

Introduction

Jute fibre is the most important cash crop and the biggest foreign exchange earner of Bangladesh. It is composed of 60–70% α-cellulose, 15–20% hemicelluloses, 5–10% lignin and 3–5% pectins, together with some fatty acid and waxy matter (Alam and Khan 2007). In recent years, it has been threatened by increasing competition from cheap synthetic fibres. It is necessary to improve the quality of jute fibre for commercial utilization, to meet total fabric requirements of the importing countries as well as to minimize the import of competing synthetic fibres.

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Conclusion