Effect of quenching process on mechanical properties of flax/polypropylene composites

Flax/polypropylene needle - punched nonwovens (550 g /m2) have been produced and then used as a preform for theproduction of composites. In this study, better infiltration of polypropylene melt into the flax fibres has been achieved byaltering the crystal structure of polypropylene in the preform. A modified sequence of production of composites is alsoproposed. The proposed method yields composite with 25, 98 and, 91% improvement in tensile, flexural and short beamstrength properties as compared to the conventional method of manufacturing

Regeneration of cellulose acetate nanofibrous mat from discarded cigarette butts

Cellulose acetate present in the cigarette butts has beenregenerated into nanofibrous mat. The developed mat is thencharacterized using various analytical tools. Uniform bead-freecellulose acetate fibre is obtained at 12 % w/v concentration ofcellulose acetate. The mat thus obtained exhibits goodantimicrobial property

Effect of ultrasonication and enzyme activity on dye uptake of cationised cotton fabric

To eliminate the usage of salt, salt-free reactive dyeing using CHPTAC (3-Chloro-2-hydroxypropyl trimethylammonium chloride) has been proposed. Studies have shown promising results, such as better dye shade attainment and less effluent load compared to conventional methods. In this work, to improve the effective utilisation of CHPTAC, the cotton fabric has been treated with cellulase enzyme and the application of CHPTAC is carried out using the ultrasonication technique. The samples are then characterised for colour parameters and it is found that the enzymatic treatment and ultrasonication lead to improve the dye uptake, as the interaction of CHPTAC with the fabric becomes better.

Wet Laying Nonwoven Using Natural Cellulosic Fibers and Their Blends: Process and Technical Applications. A Review

Wet laying is an emerging technique for the production of nonwoven using short natural cellulosic fibers and their blends unlike other nonwoven techniques that utilize chemicals and require a particular length of fibers for processing into nonwoven. The steps involved in wet laying are dispersion, deposition, and consolidation. Uniform dispersion is the key to attain defect-free nonwovens in web laying. It is similar to that of papermaking process with the difference in fiber length and density of the fibers in the process. The quality of the dispersion depends on material parameters such as fiber length, surfactant, nature of fibers, and linear density of the fibers and machine parameters such as dispersion time and mechanical agitation. The present paper summarizes the material and process parameters required for wet laying in detail along with the potential application of wet-laid nonwovens

Physical and thermal properties of nano lead oxide loaded electrospun PAN nanofibres

16-19Electrospun nanofibres of polyacrylonitrile (PAN) and PAN mixed nano lead oxide (n-PbO) matrices have been produced. With the increase in concentration of nano lead oxide in the electrospinning matrices, the diameter of fibres is found to increase. The tensile strength of electrospun matrices increases up to 0.8 wt% incorporation of nano lead oxide but with further increase in nano lead oxide the tensile strength of the web decreases. The conductivity of the parent sample is found to be better compared to that of sample mixed with n-PbO

Acid resistance of flax braided reinforced epoxy composite tubes

215-220Flax braided reinforced epoxy composites have been prepared by vacuum assisted direct resin injection moulding method. The prepared composites are then tested for flexural strength and flexural modulus. The effect of sulphuric acid concentration and immersion time on the diffusion behavior of the composite tubes has been studied. The result indicates that the sulphuric acid has a significant effect on the diffusion coefficient of the composites. With the increase in acid concentration, the diffusion coefficient values decrease initially and later increase at higher concentration. The flexural strength of the composites is found to be lower for water immersed samples as compared to that for the control samples

Effect of ultrasonication and enzyme activity on dye uptake of cationised cotton fabric

35-40To eliminate the usage of salt, salt-free reactive dyeing using CHPTAC (3-Chloro-2-hydroxypropyl trimethylammonium chloride) has been proposed. Studies have shown promising results, such as better dye shade attainment and less effluent load compared to conventional methods. In this work, to improve the effective utilisation of CHPTAC, the cotton fabric has been treated with cellulase enzyme and the application of CHPTAC is carried out using the ultrasonication technique. The samples are then characterised for colour parameters and it is found that the enzymatic treatment and ultrasonication lead to improve the dye uptake, as the interaction of CHPTAC with the fabric becomes better

Drug release and antimicrobial studies on chitosan-coated cotton yarns

543-547Cotton yarns coated with chitosan have been prepared by the oxidation of cotton yarns with sodium periodate at 60°C in water and subsequent treatment with a solution of chitosan in aqueous acetic acid. Infrared spectra of the chitosan-coated cotton yarn show the formation of Schiffs base between the chitosan and the oxidized cellulose. The chitosan-coated yarns have been further immobilized with tetracycline drug and the effect of drug concentration and treatment time on drug release characteristics and antimicrobial activity studied. The study shows good drug release characteristics and antimicrobial activity against E.coli and S. aureus