| Ultra-high molecular weight polyethylene (UHMWPE) fiber, which is the third generation of high-performance fiber after carbon and aramid fibers, has a number of advantages, such as excellent chemical resistance, abrasive resistance, impact resistance, bulletproof, cut resistance, high specific strength and modulus, etc., which make it possible to widely use in military industry, aerospace, biomedical materials, sails, towing ropes, cut resistance gloves and so on. However, UHMWPE fiber also has a lot of disadvantages, such as surface chemical inertness, super hydrophobic, poor heat resistance, weak surface bonding property, bad dyeing property and so on, which limit the more wide application of UHMWPE fiber. This paper was prepared to improve the dyeability of UHMWPE fiber with surface modification.In this paper, surface modification of UHMWPE fiber was prepared, which was treated with different parameters of atmosphere air dielectric barrier discharge (DBD) plasma. And discussed of effect of plasma treatment on disperse dye dyeing process of UHMWPE fiber. The crystallinilty, surface morphology, chemical structure, strength, moisture absorption and dyeing properties of modified fiber were investigated by using differential scanning calorimetry (DSC), scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FTIR), strength tester, capillary effect testing instrument, color test instrument, ultraviolet-visible spectrophotometer and so on. The results showed that:1. During the DBD plasma modified UHMWPE fiber, a little heat made molecular chain more ordered, which led to improve fiber’s crystallinilty slightly. But crystallinilty did not change in law with the increase of treated power or time. With the increase of treated power or time, the surface of modified fiber appeared many etch pits and the pits got gradually the more and the deeper, which made surface of fiber more roughness. The result of FTIR analysis indicated that many oxygen groups were grafted on the fiber, which improved the fiber’s surface polarity. Fiber’s moisture absorption was increased with the increase of treated power or time from8.34cm to10.98cm. As the treated power or time increased, fiber’s strength tended to decrease continuously, but strength dropped by less than10%in the main.2. The results of reactive dye, weak acid dye, cationic dye and disperse respectively dyed modified fiber analysis showed that:reactive dye did not dye the fiber before and after modification. Other three kinds of dyes could dye the fiber, but the dye uptake was different. While dyeing improvement effect of disperse dye was most obvious and its dye uptake was highest. The fiber’s K/S and chromatism gradually increased with the increase of treated power or time. Considering the modified fiber’s strength and dyeing properties selected treated power80W and treated time27s as the better plasma treatment parameters, where the fiber’s strength was maintained at a level of93.31%of untreated fiber, dyeing fiber’s K/S was1.5552and dye uptake was60.1%.3. Disperse dye dyeing process of DBD plasma treated fiber and the change of fiber’s strength before and after dyeing were studied, it was found that the surface of modified fiber had a number of pits and a few oxygen polar functional groups, which led to increase adsorbing and inward diffusion speed of dyes. In addition, modified fiber’s dyeing time was reduced, dyeing temperature was decreased and dyeing utilization rate was improved. As the dyeing temperature or time increased, the fiber’s strength retention rate reduced after dyeing. Considering the dyeing properties and strength retention rate of modified fiber selected dyeing temperature120℃, dyeing time90min and dyeing content4%as the better dyeing process parameters, where fiber’s strength was maintained at a level of85.7%of untreated fiber and dye uptake was some60%. |
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