Bamboo pulp fiber as one of new promising green fiber was widely used in clothing, medical, automotive, construction, transportation, and many other areas. However, bamboo pulp fiber also has many defects such as larger shrinkage, lower wet strength, fabric wrinkle, and the poor ability to keep type. In this study, a green modification method for bamboo fiber was applied to overcome above-mentioned drawback and verified by scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray diffraction, and solid-state CP/MAS 13C nuclear magnetic resonance respectively. The scanning electron microscopy results showed that oxidation treatment can cause fibers edge damage and denudation after modification, but can introduce the carboxyl groups to C 6 position of pure bamboo cellulose macromolecular. The X-ray diffraction results revealed that the fibers’ crystalline structure was not changed throughout the modification process. The oxidation treatment processes can be interpreted as following: amino groups of silk fibroin first react with the carboxyl group and are connected to the fibers though C–N covalent bond, and then a smooth silk fibroin film was formed on the surface of fibers by crosslinking reaction of itself.
The cotton fiber was treated by the selective oxidation with the solution of sodium periodate,and the effects of concentration of sodium periodate,oxidation time,and treatment temperature on the mechanical properties of oxidized cotton fiber were investigated through the control of oxidation process.The results showed that the weight of cotton fiber after sodium periodate oxidation reduced,the breaking tensile strength of cotton fiber with slight oxidation did not change significantly,whereas decreased after severe oxidation by sodium periodate,and the breaking strength decreased more obviously with the increase of oxidation degree of cotton fiber.
Abstract For exploiting the ecological multifunctional cotton fabric, the citric acid, maleic acid and soybean protein were used to treat the cotton fabric so that the chemical bonding between soybean protein and cotton fabric was formed through the bridging function of multicarboxylic acids. Effects of treating conditions on the weight gain of cotton fabric were analyzed and the optimized process parameters were also obtained. The characterization of infrared spectra showed that the esterification crosslinking occurred between multicarboxylic acids and macromolecules of cotton fiber according to ring-anhydride mechanism, while the soybean protein was combined on cotton fabric with the amido bond by the bridging function of multicarboxylic acids. The breaking strength of soybean protein modified cotton fabric slightly decreased, whereas the anti-ultraviolet property of modified cotton fabric after cactus extract treatment improved remarkably.
The oxidized bamboo pulp fiber yarns were prepared by the HNO3 /H3PO4-NaNO2 oxidation system. The effects of the oxidation concentration and reaction time on the weight loss, the carboxyl content and the breaking strength of the bamboo pulp fiber yarns were studied and the aggregation structure was investigated by Fourier transform infrared, X-ray and scanning electron microscopy. The results revealed an increase in carboxyl content and a decrease in breaking strength of oxidized bamboo pulp fiber yarns with increasing concentration of oxidant and reaction time. The breaking strength of oxidized bamboo fiber yarns was damaged seriously once the reaction time was more than 120 min or the concentration of oxidant was greater than 1.0%. The crystallinity of bamboo pulp fibers increased slightly under low oxidation degree but decreased with higher oxidation degree.
The deweighting ratio of affecting finish effects were analyzed through cellulase finishing cotton knitted fabric. The result showed that the handle、absorbent quality 、air permeability and other properties of cotton knitted fabric finished with cellulase were improved obviously, and the eroding of cellulase finishing for external structures of cotton fibre was visible,furthermore the negative correlations between fabric intensity and deweighting ratio were very remarkable.
In this study, oxidized chitosan grafted cashmere fibers (OCGCFs) were obtained by crosslinking the oxidized chitosan onto cashmere fibers by amide covalent modification. A novel method was developed for the selective oxidation of the C6 primary hydroxyls into carboxyl groups for chitosan. The effect of oxidization reaction parameters of HNO3/H3PO4–NaNO2 mediated oxidation system on the oxidation degree, structure, and properties of chitosan were investigated. The chemical structure of the oxidized chitosan was characterized by solid-state cross-polarization magic angle spinning carbon-13 Nuclear Magnetic Resonance (CP/MAS 13C-NMR), Fourier transform infrared spectroscopy (FT-IR), and its morphology was investigated by scanning electron microscopy (SEM). Subsequently, the effect of the oxidized chitosan grafting on OCGCF was examined, and the physical properties, moisture regain, and antibacterial activity of OCGCFs were also evaluated. The results showed that oxidation of chitosan mostly occurred at the C6 primary hydroxyl groups. Moreover, an oxidized chitosan with 43.5–56.8% carboxyl content was realized by ranging the oxidation time from 30 to 180 min. The resulting OCGCF had a C–N amido bond, formed as a result of the reaction between the primary amines in the cashmere fibers and the carboxyl groups in the oxidized chitosan through the amide reaction. The OCGCF exhibited good moisture regain and remarkable bacteriostasis against both Staphylococcus aureus and Escherichia coli bacteria with its durability.
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