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Jute dyeing is a major problem in jute trade since it has an affinity for a wider range of dyestuffs due to its structural peculiarities. Jute is dyed, generally, in order to enhance its pleasing appearance by the attraction of hue and that the hue should be uniform over the whole. Dyeing does not mean only to impart attractive hue on the fibre, but to attain fast colour on it.Depending on the demand of jute and jute products, dyeing technology of jute did not progress like other textile fibres. Due to structural peculiarities ORIENTAL JOURNAL OF CHEMISTRY ABSTRACTDyeing of direct dyes, viz. Direct Yellow 29, Direct Orange 31 and Titan Yellow, has been carried out on jute fibre in the presence of sodium sulphate as an electrolyte. The effect of pH on dyeing have been studied and the results showed comparatively better dye uptake at pH 8.0. Assesment of light and wash fastness, acid and alkali spottings, and breaking strength of direct dyed jute fibre was carried out. Direct Orange 31 showed comparatively better fastness properties than other dyes.

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Vinyltrimethoxy silane and aminopropyl triethoxysilane were used for surface functionalization to enhance the textile performance of cotton. The process was carried out in an ethanol-water medium, which accelerated the cross-linking reaction between fiber and silane monomers. The process was optimized carefully as a function of fiber weight gain. The optimized modification conditions were silane monomer concentration 600 and 300% (on weight of fiber), ethanol-water ratio 60:40 and 80:20, pH 3.5 and 5, reaction time 90 and 60 min at room temperature (30°C), for VTMS and APTES, respectively. The silane-modified cotton fiber showed improved tensile strength, water repellency, thermal stability and wrinkle recovery. These improvements are due to flexibility of the Si-O bond and the fiber matrix interfacial strength properties. Instrumental analyses, such as FTIR, TGA, DTG, SEM and EDX, were carried out successfully. FTIR was used to identify the Si-O-Si group of VTMS and the Si-O-CH3 of APTES on modified cotton fibers, and TGA and DTG were used to evaluate the modification's effect on the thermal stability of the fiber. SEM was used to study the surface morphology after modification and EDX was used to measure the quantity of elemental silicon atoms on the fiber backbone. Finally, unmodified and silane-modified cotton fibers were dyed with two reactive dyes and the modified cotton fiber showed better ability to accept dye than that of the unmodified fiber.