For the modification of poly(ethylene terephthalate) (PET) fabric, a type of epoxy compound, glycerol polyglycidyl ether (GPE), was impregnated as a cross-linking agent into PET fabric by means of supercritical carbon dioxide (scCO 2 ), then, a series of immobilization processes were implemented, including the pad-drycure process and the solution process to finish the GPE-PET fabric with natural functional agents (sericin, collagen, or chitosan). Chloroform was found to be an effective cosolvent, as evidenced by the mass transfer of GPE to PET during the treatment with scCO 2 . Chemical analyses by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy showed that GPE can penetrate the surface of the PET fabric in scCO 2 pretreatment process, and natural functional agents (sericin, collagen, or chitosan) can also be immobilized on the surface of the GPE-PET fabric especially for the method of pad-drycure. The nitrogen content in the modified PET fabrics was calculated accurately and confirmed by combustion analysis. The modified PET fabric displayed improvements in surface wettability, moisturization efficiency, and antibacterial characteristics against S. aureus, which demonstrated that the feasibility of this design for immobilizing natural functional agents (sericin, collagen, or chitosan) onto the surface of the PET fabric.
In order to realize the immobilization of collagen, chitosan and sericin on the surface of polypropylene fabric, the fabric is treated by ammonia and nitrogen low temperature plasma to produce reactive groups, and then the epoxy compounds (ethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether) are used as crosslinkers for a bridging process. Single factor experiment is carried out to investigate the influence of crosslinking parameters (temperature, time and the dosage of crosslinker) on immobilization yield. Chemical composition changes on the surface of the treated samples is analyzed by infrared spectroscopy, which indicated that the ammonia plasma treatment can produce more active groups. The results showed that immobilization rate of samples crosslinked by ethylene glycol diglycidyl ether is superior to that of trimethylolpropane triglycidyl ether. It also can be found that the fabric had a better wettability and antimicrobial properties. The whiteness and comfort property of chitosan-polypropylene fabric decreased slightly.
In order to develop electromagnetic shielding (EMS) fabric with high-performance, aramid / stainless steel fiber blended yarns were used to achieve it, and its electromagnetic shielding effectiveness (EMSE), flame retardancy and tensile properties were tested. The effects of fabric structure, fabric thickness, and fabric overlap angle on fabric properties were studied. The results showed that the plain weave fabric has the best EMSE among three kinds of fabrics with plain, twill and satin weaves. The EMSE of the satin weave is the worst. When the fabric thickness increased, the EMSE enhanced. The EMSE at the fabric overlap angle of 45° is the highest when the overlap angle is changed from 0° to 90°.
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