The roles of slightly crosslinked poly( dimethyldiallylammonium chloride) s( PDMDAACs) in fixing anionic dyes on cotton fabric were verified more precisely by optical analysis technologies,to achieve the new theoretic...The roles of slightly crosslinked poly( dimethyldiallylammonium chloride) s( PDMDAACs) in fixing anionic dyes on cotton fabric were verified more precisely by optical analysis technologies,to achieve the new theoretical guides for the widely applications. Firstly,one method of optical CIELAB color difference analysis was designed to exactly measure the values of dyefixing performances, so that the suitable molecular weights and structures of the slightly crosslinked PDMDAACs could be precisely confirmed to play a role in the development of their dye-fixing performances. Secondly,the FT-IR absorption shift of the dye on dyed cotton sample fixed by slightly crosslinked PDMDAACs was nearly in agreement with that of forming water-insoluble color lakes,indicating that the expected color lakes could be formed on dyed cotton fabric,and would play a role in further development of the fastness of dyes on cotton fabric. Thirdly,the FT-IR spectra of fixed undyed cotton samples and that of fixed dyed cotton samples both showed the absorptions of slightly crosslinked PDMDAACs,further revealing that the slightly crosslinked PDMDAACs could be penetrated into cotton fabric and be convenient to interact with dyes when fixing. However,those absorptions of the slightly crosslinked PDMDAACs fixed on cotton samples would be absent after being adequately washed to a constant weight,suggesting that the fixing interactions of the slightly crosslinked PDMDAAC and cotton fabric were very weak.展开更多
Cationic copolymer acrylamide-dimethyldiallylammonium chloride [P(AM/DMDAAC)] was synthesized from acrylamide(AM)and dimethyldiallylammonium chloride(DMDAAC)by dispersion polymerization.The structures of polymers synt...Cationic copolymer acrylamide-dimethyldiallylammonium chloride [P(AM/DMDAAC)] was synthesized from acrylamide(AM)and dimethyldiallylammonium chloride(DMDAAC)by dispersion polymerization.The structures of polymers synthesized in different systems of dispersion were determined with infrared spectroscopy.The results showed that ethanol-H2O was the best system of dispersion.The characteristics of PDMDAAC-AM were studied by means of various instrumental analysis techniques,including transmission electron microscope(TEM)and Zetasizer 3000HSA.The results showed that the particle size of cationic PDMDAAC-AM synthesized in the ethanol-H2O system of dispersion was within the range of nanometer,and the dispersion polymerization in the emulsion state was helpful to dissipation of reaction heat.展开更多
The title copolymer was synthesized by grafting dimethyldiallylammonium chloride onto chitosan with ammonium cerium nitrate as initiator. The effects of reaction temperature, pH and concentration of initiator on produ...The title copolymer was synthesized by grafting dimethyldiallylammonium chloride onto chitosan with ammonium cerium nitrate as initiator. The effects of reaction temperature, pH and concentration of initiator on product yield were examined. The optimum conditions were as follows:90 ℃, concentration of initiator 5×10 -4 mol/L, pH=6. The flocculation experiments on the fermentation wastewater showed that flocculabi- lity of the chitosan graft copolymer was better than the chitosan itself and the flocculation treatment could be carried out at lower dosage and wider pH range.展开更多
基金Science and Technology Project of Education Department of Jiangxi Province,China(No.GJJ13213)
文摘The roles of slightly crosslinked poly( dimethyldiallylammonium chloride) s( PDMDAACs) in fixing anionic dyes on cotton fabric were verified more precisely by optical analysis technologies,to achieve the new theoretical guides for the widely applications. Firstly,one method of optical CIELAB color difference analysis was designed to exactly measure the values of dyefixing performances, so that the suitable molecular weights and structures of the slightly crosslinked PDMDAACs could be precisely confirmed to play a role in the development of their dye-fixing performances. Secondly,the FT-IR absorption shift of the dye on dyed cotton sample fixed by slightly crosslinked PDMDAACs was nearly in agreement with that of forming water-insoluble color lakes,indicating that the expected color lakes could be formed on dyed cotton fabric,and would play a role in further development of the fastness of dyes on cotton fabric. Thirdly,the FT-IR spectra of fixed undyed cotton samples and that of fixed dyed cotton samples both showed the absorptions of slightly crosslinked PDMDAACs,further revealing that the slightly crosslinked PDMDAACs could be penetrated into cotton fabric and be convenient to interact with dyes when fixing. However,those absorptions of the slightly crosslinked PDMDAACs fixed on cotton samples would be absent after being adequately washed to a constant weight,suggesting that the fixing interactions of the slightly crosslinked PDMDAAC and cotton fabric were very weak.
文摘Cationic copolymer acrylamide-dimethyldiallylammonium chloride [P(AM/DMDAAC)] was synthesized from acrylamide(AM)and dimethyldiallylammonium chloride(DMDAAC)by dispersion polymerization.The structures of polymers synthesized in different systems of dispersion were determined with infrared spectroscopy.The results showed that ethanol-H2O was the best system of dispersion.The characteristics of PDMDAAC-AM were studied by means of various instrumental analysis techniques,including transmission electron microscope(TEM)and Zetasizer 3000HSA.The results showed that the particle size of cationic PDMDAAC-AM synthesized in the ethanol-H2O system of dispersion was within the range of nanometer,and the dispersion polymerization in the emulsion state was helpful to dissipation of reaction heat.
文摘The title copolymer was synthesized by grafting dimethyldiallylammonium chloride onto chitosan with ammonium cerium nitrate as initiator. The effects of reaction temperature, pH and concentration of initiator on product yield were examined. The optimum conditions were as follows:90 ℃, concentration of initiator 5×10 -4 mol/L, pH=6. The flocculation experiments on the fermentation wastewater showed that flocculabi- lity of the chitosan graft copolymer was better than the chitosan itself and the flocculation treatment could be carried out at lower dosage and wider pH range.
