A facile approach of Hydrogen Peroxide and Irradiation of doses from Cobalt-60 gamma the source is applied to 100% cotton fabric pretreatment reported in this study. Novel changes are observed in Absorbency, Whiteness Index, Bursting Strength and Weight Loss percentage. Various concentration of H2O2 treated different samples absorbed different dosed of Co-60 gamma by the decay of fabric surface to give shiny effect on it as pretreatment replaces of scouring and bleaching. Reduce the use of lots of water and hazardous chemicals of conventional which has novel benefits for the environment. This less time-consuming process makes more efficient comparatively conventional method.
Polyaniline (PANI) is one of the most important conducting polymer and has been widely used in various fields for its tunable electrical conductivity. In this manuscript, conductive polyaniline/ramie fabrics were developed by in situ polymerization and characterized. The effect of aniline content, polyetherimide (PEI) pretreatment, padding and the color depth (K/S value) on electrical resistivity was analyzed. The result showed that electrical conductivity was increased with the increase of aniline (ANI) contents. PEI pretreatment and padding method improved the conductivity of the fabric significantly. The result of K/S value was reversely consistent with the conductivity. Both scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis confirmed that polyaniline particles were successfully deposited on the surface of the ramie fabrics. Thermal degradation (TG) measurement showed that polyaniline (PANI) polymerization decreased the onset decomposition temperature. Mechanical measurement showed that pretreatment process reduced the tensile strength of conductive ramie fabrics by 30%. K/S value in full range showed that the color of PANI/ramie fabric was sensible to pH value. Contact angle (CA) measurement disclosed the conductive PANI/ramie fabric was hydrophobic and this hydrophobicity was stable to the change of pH value. The obtained PANI/ramie fabrics can be used as potential conductive multifunctional textiles.
Cotton fabrics were modified through an oxidation of the fabric with hydrogen peroxide followed by chitosan to improve their dyeability toward cochineal natural dye. Comprehensive studies were conducted on these fabrics to select chitosan modification process and assess their dyeability to cochineal in the ethanol-water system. The scanning electron micrograph showed the chitosan was deposited on the surface of cotton fiber. The infrared spectrum revealed the interaction between chitosan and cellulose further. Thermal gravity analysis showed the treatment produced little effect on the thermal stability of the cotton fabric. Treating cotton with 15 g/L chitosan and baking at 130°C offered higher cochineal adsorption. Dyeing with increased time and at elevated temperatures resulted in higher dye uptake. The ratio of ethanol and water had obvious effects on solution polarity and when the proportion of ethanol and water was 9:1, cochineal adsorption reached maximum value. pH value had complex effects on K/S value and pH 7 yielded the highest color strength. Dyeing kinetics curves indicated that with the increase of the dyeing temperature, dye diffusion coefficient increased and half dyeing time decreased. The washing and rubbing fastness of the treated cotton fabrics were all improved and rated above grade 3.
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