Research On The Radiation Stability Of Dyes And Colouration Of Cotton By Radiation Induced Graft Polymerization

Textiles are important materials in constituting daiy necessities.Fabrication and research of functional textiles is the key of innovative application of textiles.Our group widely researched functional applications on textiles by using radiation induced graft polymerization(RIGP)method.At present,functional textiles that fabricated through RIGP method were performed on grey cloth and preparation method was simplex so that multifunctional application can not be realized.Therefore fabrication of multifunctional textiles by incorporating textile coloration and RIGP functionalization is the research topic of this dissertation.Firstly,stability of structure and functional groups of organic dyes were studied as well as the changes on the color of organic dyes.The possibility of direct functionalization of dyed textile by RIGP method was discussed.Secondly,environment-friendly nanoparticles as carbon black(CB),cobalt green(CoG),cobalt blue(CoB)and iorn red(FeR)were used as dye-fixing agent to replace organic dyes.These nanoparticles were covalently immobilized on the surface of cotton by RIGP method to realize environment-friendly coloration of cotton.Thus this work provided basis of further RIGP based functionalization on dyed textiles.The main results are listed as follows:(1)Study of radiation stability of azo dyes.Disperse blue 79 was chosen as an example of azo dyes and irradiated in poweder and aqueous solution under gamma rays and electron beams(EB).Structural stability and colour changes of irradiated disperse blue 79 were discussed.UV-Vis,NMR and MS results indicated that disperse blue 79 kept stable structure in powder when absorbed dose increased from 0 kGy to 150 kGy.However,methoxy groups and acetoxethyl groups were easy to cleavage when irradiated by Gamma rays and EB in aqueous solution.(2)Immobilization of carbon black nanoparticles on cotton fabricThis work then replaced organic dyes with CB nanoparticles and immobilized nanoparticles on the surface of cotton by RIGP method to realize the coloration of cotton.CB nanoparticles were reacted with silane coupling agent KH570 and then were immobilized with monomers on cotton by RIGP method.IR and TG results indicated that CB nanoparticles were succeccfully immobilized on the surface of cotton fabric,and degree of grafting(DG)efficiency of nanoparticles and monomers were more than 90%,which indicating nanoparticles were effectively immobilized on cotton by covalent networks between nanoparticles and cotton fabric.Lab chromaticity results indicated the colour of cotton fabric could be controlled by changing concentration of nanoparticles.Nanoparticles were still on the surface of fabric even after performing 100 cycles domestic laundering of dyed cotton,and colour of dyed cotton kept stable.Wastewater that generated by immobilizing nanoparticles could be discharged directly by standards of GB 38-2002 and zero discharge of hazardous chemicals(ZDHC)(3)Immobilization of CoB,CoG and FeR nanoparticles on cotton fabricCoB,CoG and FeR nanoparticles were reacted with KH570 to modify carbon-carbon double bond on its surface and then were immobilized on the surface of cotton by RIGP method to realize three-primary colour coloration.IR and TG results indicated that CoB,CoG and FeR nanoparticles were successfully modified with carbon-carbon double bond and were immobilized on cotton by RIGP method.SEM results indicated nanoparticles were uniformly dispersed on fabric.Chromaticity results showed cotton colour can be controlled by changing concentration of nanoparticles.The coloured fabric could undergo 100 cycles domestic laundering and kept colour stable.Wastewater could also be discharged directly taking related stardands into consideration.(4)Immobilization of mixed nanoparticles on cotton fabricThree-primary colour nanoparticles CoB,CoG and FeR were blended each other by different ratios to produce other mixed colour nanoparticles.The mixed nanoparticles were modified with carbon-carbon double bond and then were immobilized on cotton fabric through RIGP method to realize coloration of mixed colours.IR and TG results indicated that mixed nanoparticles were successfully immobilized on fabric surface.Chromaticity results indicated mixing ratios could control the colour transformation of cotton.Wastewater that generated through immobilizing cyan,yellow and magenta nanoparticles on cotton was analyzed and results showed them could be discharged directly.Cotton immobilized with cyan,yellow and magenta nanoparticles could also undergo 100 cycles domestic laundering with nanoparticles still on it and cotton color matained stable.Through the research of coloration of cotton by immobilizing mixed nanoparticles,it was concluded that all colours of environment-friendly coloration of cotton could be achived by immobilizing nanoparticles on cotton.