NOPR Collection:

Extraction procedure and tensile properties of Dharbai and Christmas palm natural fibres

Sun, 01 Mar 2015 00:00:00 GMT

Title: Extraction procedure and tensile properties of Dharbai and Christmas palm natural fibres Authors: Sundaram, S Kalyana; Jayabal, S Abstract: A new variety of natural fibres has been extracted from Dharbai and Christmas palm for their use as reinforcement in polymer matrix composites. The tensile properties and cross-section area of Dharbai and Christmas palm fibres have been evaluated experimentally and compared with natural fibres such as sisal, banana and coir which are already used as reinforcement in polymer composite. Monofilament test has been used to study the tensile properties of the fibres and Rapid-I machine vision system is used to determine the diameter of the fibres. Density of the fibre is determined using picnometric procedure. The investigation confirms that Dharbai and Christmas palm fibres could be effectively used as reinforcement materials in the natural fibre reinforced polymer composites. Page(s): 108-111

Antibacterial finish of textile using papaya peels derived silver nanoparticles

Sun, 01 Mar 2015 00:00:00 GMT

Title: Antibacterial finish of textile using papaya peels derived silver nanoparticles Authors: Agarwal, Rashi; Garg, Neelam; Kashyap, Sonu Rani; Chauhan, R P Abstract: The present study is aimed at the extracellular synthesis of highly stable silver nanoparticles for the development of nanosafe textile using the extracts of yellow papaya peel. Fabric is treated with nanoparticles using dip and dry method to observe the effect of antibacterial activity. The synthesized nanoparticles are also characterized and quantified. Due to their potent antibacterial activity, papaya peels derived silver nanoparticles can be incorporated into fabrics and the manufacturers can make textiles free from spoilage by microorganisms. Page(s): 105-107

Theoretical and experimental methods of dynamic clothing pressure performance

Sun, 01 Mar 2015 00:00:00 GMT

Title: Theoretical and experimental methods of dynamic clothing pressure performance Authors: Yongrong, Wang; Peihua, Zhang; yuan, Yao Abstract: A dynamic pressure measuring system has been developed in this study. This system can be used for static pressure measuring, real-time dynamic pressure measuring and pressure fatigue analysis. A 3D geometric model on fabric deformation as well as mechanical behavior has been developed, which can be used for simulating the fabric elongation during dynamic pressing, and to deduce relationship between the press depth and fabric elongation. The process parameters of measuring system have been systematically estimated and analyzed. The range of press depth fixed for dynamic pressure measurement is found to be 58-115 mm, which responds to the fabric elongation from 10% to 40%. The press velocity at 100 mm/min is considered as the optional one for dynamic pressure measurement. Five repeated test cycles can be satisfied to assess the dynamic pressure fatigue performance quickly. Page(s): 94-99

Enzymatic dyeing and functional finishing of textile fibres with ferulic acid

Sun, 01 Mar 2015 00:00:00 GMT

Title: Enzymatic dyeing and functional finishing of textile fibres with ferulic acid Authors: Sun, Sha-Sha; Xing, Tieling; Tang, Ren-Cheng Abstract: The catalyzed polymerization of ferulic acid (FA) by laccase from Rhus vernicifera has been studied, and its polymeric products are used for the dyeing and functional finishing of silk, wool, nylon, viscose and cotton fabrics by two methods, namely simultaneous enzymatic polymerization of FA and dyeing at 50 ^oC (one-step method), and enzymatic polymerization of FA at 50 ^oC followed by dyeing at 90 ^oC (two-step method). The analyses of UV-Visible and FTIR spectra show the formation of yellow poly(ferulic acid) (PFA) in which FA units are mainly linked together with C–C bonds. The colouration of PFA on fabrics occurs due to physical adsorption, and not because of interaction of covalent bond between PFA and fibres. The enzymatically dyed fabrics display yellow to orange colour hues, and pale to moderate colour depth, depending on fibre species and dyeing methods. The dyed fabrics show excellent rub fastness and staining fastness during washing, relatively weak light fastness and colour change fastness during washing; the two-step method shows better wash fastness ratings for colour change. The enzymatic dyeing of FA provides fabrics with multifunctional properties of antioxidant activity, UV-protection and deodorization. Page(s): 62-69