Surface Modification Of Polyamide And Poly (Ethylene Terephthalate) Fabrics By Solid-State UV Laser

The irradiation of UV laser is one of physical methods for surface modification of polymers, which is friendly to the environment. The thesis was aimed to study the fiber surface morphology, physical and chemical properties of polyamide(PA) fabric irradiated by UV laser. The dyeing property of the irradiated PA fabric was also researched. Meanwhile, the surface morphology and dyeing property of the irradiated Poly(ethylene terephthalate) (PET) was researched.Scanning electron microscope (SEM) observation revealed the morphological modification of the polyamide 66 film irradiated by UV laser with the appearance of ripples perpendicular to the extendible direction of the film. However, the ripples did not appear in the fiber surface of the irradiated polyamide fabrics.The N/C and O/C ratio in the fiber surface of the UV laser irradiated polyamide 66 fabric decreased, while in the polyamide 66 film surface, the N/C ratio decreased and the O/C ratio increased. Antistatic property and hydrophilic character of PA fabric irradiated by UV laser were greatly improved .But the whiteness, tensile strength and elongation of the PET fabric irradiated by UV laser decreased adversely.X-ray diffraction analysis showed that the crystalline region of the irradiated PA fiber reduced. The relative dye speed and the K/S value of the laser irradiated PA fabric dyed with acid dyestuff increased accordingly. When dyeing temperature descended, the UV laser irradiated PA fabric got much deeper shade than the untreated fabric when they were dyed with the acid dyestuffs using the same process and formulation. Compared with the untreated PA fabric, the color fastness to rubbing and to light of the laser irradiated PA fabric dyed with acid dyestuff changed little, while the color fastness to washing and to perspiration reduced by 0.5 grade.Scanning electron microscope (SEM) observation revealed the morphological modification of the PET fiber irradiated by UV laser with the appearance of ripples perpendicular to the axis of the fiber. When the dyeing temperature descended, the laser irradiated PET fabric got much deeper shade than the untreated PET fabric when they were dyed with the disperse dyestuffs using the same process and prescription. The K/S value of the laser irradiated PET fabric dyed with disperse dyestuff were affected by laser parameters including power, pulse frequency, interval between filling lines, valid vector step size, and time delay between valid vector steps, etc. When dyed at 100℃, the laser irradiated PET fabric dyed with disperse dyestuff exhibited the unchanged color fastness to washing and to rubbing. The differential dyeing patterns was designed by the laser soft software, and the good differential dyeing effects were finally achieved.