Effect of wetting pretreatment on structure and properties of plasma induced chitosan grafted wool fabric

Abstract

Chitosan (CS) was grafted on the wool after being wetted at different relative humidity (5 %, 65 % and 95 % RH) and induced by O 2 plasma to investigate the influence of wetting pretreatment on the structure and properties of plasma induced chitosan (PICS)-grafted wool fabric. The effects of the RH of wetting pretreatment, CS concentration and grafting time on weight gain ratio and PICS-grafted wool fabric properties including wettability, dyeability and shrink resistance were studied. Scanning electron microscopy (SEM) observation showed that the scales on the wool fiber wetted at 95 % RH and then treated by O 2 plasma were more severely damaged. The surface roughness and polar group content of PICS-grafted wool fabrics increased with the RH of wetting pretreatment. The analysis results of surface morphology by SEM and chemical composition by X-ray photoelectron spectroscopy (XPS) revealed much more CS on the surface of PICS-grafted wool fabric wetted at 95 % RH. The analysis results of weight gain ratio, contact angle, K/S value and area felting shrinkage manifested the optimum parameters of PICS grafting on the wool fabric wetted at 95 % RH could be set as the chitosan concentration of 2 g/l and the grafting time of 2 h. The machine washable wool fabric with the area felting shrinkage of 4.5 % and the better wettability and dyeability could be obtained by a new ecologically acceptable process of PICS grafting on the wool wetted at 95 % RH.

Microwave-assisted deposition of silver nanoparticles on bamboo pulp fabric through dopamine functionalization

“…Many different methods have been developed to synthesize silver nanoparticles onto textiles such as electrochemical coating [9], spraying [10], treatment with plasma [11], vapor deposition [12], sputtering [13], layer-by-layer assembling [14], laser engraving [15] and microwave-assisted chemical reduction [16,17]. Microwave-assisted chemical reduction has been recently used as a technique for synthesis of nanomaterials because microwave irradiation can offer rapid and uniform volumetric heating, high reaction rates, short reaction time, high yield production and low cost.…”

Development of Environmentally Friendly Wool Shrink-Proof Finishing Technology Based on L-Cysteine/Protease Treatment Solution System

“…The C content of the raw fiber was 80.71%, which was more than that in whole wool (50–55%), due to the presence of a lipid layer on the fiber surface. The C content on the fiber surface decreased to 78.86% after the treatment, while the content of N on treated fibers (5.89%) was higher than that on raw wool (3.35%), and the proportion of S on the surface decreased from 1.55 when untreated to 1.14 [ 34 , 35 ]. The main reason for the elemental content change is that parts of the scale structure are destroyed by hydrolysis during the finishing process, exposing polar groups such as amino groups on the fiber surface.…”

“…Compared with raw wool, the intensity value of the -S–S- characteristic peak in treated fibers decreased from 2131 to 1993, while the -S–O- characteristic peak increased noticeably. These phenomena prove that the L/PTSS reduced the disulfide bonds in wool scale to form thiol groups during the shrink-proof finishing process, where some thiols were further oxidized by the environment to form sulfonate, resulting in decreased disulfide bond content in the treated fibers [ 35 , 37 ].…”