Study On Physic-chemical And Dyeing Properties Of Cellulose Acetate Tow Based On Wearability

Cellulose acetate(CA)is one of the most important derivatives from cellulose.Its filament fabric has a silky gloss and feel,strong color fastness,excellent drapability,no electrostatic adsorption and dimensionally stable,etc.Nowadays,this is more and more favored by internationally renowned fashion designers.Where as cellulose acetate filament(CAF)mainly relies on imports,being affected by high production costs,but cellulose acetate tow(CAT)in abundant availability,but has not been used much in textiles.Therefore,based on the characteristics of textile fibers;this paper focuses on the structural characteristics,thermodynamics,mechanical properties and dyeing properties of cellulose acetate tow.By comparing with the parameters of cellulose acetate filament,the feasibility of applying cellulose acetate tow in textiles was determined.Firstly,the surface morphology,molecular structure and crystallinity of the fibers were analyzed by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and X-ray diffraction(XRD).At the same time,the thermal properties of the fibers were tested by differential scanning calorimetry(DSC)and thermogravimetric analyzer(TGA),and the thermal energy and thermal stability of cellulose acetate were characterized according to the activation energy of thermal degradation kinetics.The results showed that the chemical composition of CAT was similar to that of CAF.The crystallinity of CAT was 25.9%,which was slightly lower than that of CAF.In addition,the thermal degradation temperature range of fiber was 350-450 ?,and the weight loss rate remained at around 86%.Moreover,with the increase of the heating rate,the initial decomposition temperature of the fiber increases,the maximum weight loss rate increases and the corresponding degradation temperature increases.The thermal activation energy of CAT obtained by Friedman method is 174.65 KJ / mol,which is lower than that of CAF thermal degradation under the same condition,which is consistent with the results obtained by Kissinger method.Secondly,the viscoelasticity model of the fibers was used to characterize the viscoelastic properties of the fibers.The mechanical properties of CAT were studied,the results showed thatthe break strength of CAT and CAF was 1.04 cN/dtex and 1.91 cN/dtex,respectively,the elongation rates were 23.81% and 27.84%,respectively,but the tows were more elasticity than filaments,and the elastic modulus of CAF were higher and the viscous characteristics were significant.In addition,the effects of different chemical agents on CAT were studied.It was found that the chemical resistance of tow and filament was similar.CAT is more resistant to acid than alkali.Also,treatment with the oxidant and reducing agent had no significant effect on the strength and weight of CAT.Finally,the dyeing properties of cellulose acetate tow and the change in tensile propertied before and after dyeing.For cellulose acetate tow dyed with disperse dye,the influence of dyeing temperature,pH,liquor ratio,dye concentration,Sodium salt of polynaphthalene sulphonic acid(diffusion agent NNO)content for cellulose acetate tow were investigated.The results showed that disperse dyes have the highest dyeing uptake at 85?,pH value of about 6,bath ratio 1:50,dyestuff charge of 0.5%(owf),and the addition of diffusion agent NNO affected dyeing performance.Meanwhile the color fastness to washing was observed to be very good at a rating of about 4/5 for both dyes after dyeing,but fibers' breaking strength decreased by 5.8%,elongation at break reduced about 16.7% and initial modulus increased by about 24.4% after dyeing.Scanning Electron Microscope(SEM)observation of the fibers showed no significant damage.