Key Laboratory of Chemical Biology of Jiangxi Province

Nanchang, China

Key Laboratory of Chemical Biology of Jiangxi Province

Nanchang, China
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Jia Q.,Jiangxi Normal University | Song C.,Jiangxi Normal University | Li H.,Jiangxi Normal University | Huang Y.,Jiangxi Normal University | And 3 more authors.
Materials and Design | Year: 2017

In order to realize the high efficient purification of dyeing waste-water, we designed the construction of the polycationic film coated on cotton. We firstly detected that the crystallization spaces of natural cotton could be decreased by triethanolamine pretreatment, so that the cationic reagent:3-chloro-2-hydroxypropylmethyldiallylammonium chloride (CMDA) could be grafted more efficiently, in turn forming the higher cationic degrees of grafting cotton (G-cotton). Subsequently, a copolymerization of another cationic monomer: dimethyldiallylammonium chloride (DMAC) with the cationic CMDA units in G-cotton was carried out, to obtain the polycationic film coated cotton (PF-cotton). Under equal conditions, the G-cotton adsorption capacity of anionic dyes was 15.70 times of that of activated carbon, while the PF-cotton adsorption capacity was near to that of G-cotton, but the average adsorption rate of PF-cotton was 2.8 times of that of G-cotton, indicating that the obtained PF-cotton was very suitable to purify the dyeing waste-water. Moreover, the PF-cotton had a wide range of application universal, e.g., enlarged use, adsorbing different dye solutions and simulated dyeing waste-water, being a filtering filler, and recycling utilization. In addition, we also detected that a new inductive effect occurred in the process of PF-cotton adsorption, playing an important role in speeding up the adsorption. © 2017 Elsevier Ltd

Jia Q.,Jiangxi Normal University | Song C.,Jiangxi Normal University | Chen X.,Donghua University | Zhang Z.,Jiangxi Normal University | And 5 more authors.
Fibers and Polymers | Year: 2017

A new discovery was made in which commercially available triethanolamine could reduce the lattice volume of the supermolecular structure of cotton from the periphery of the lattice by moving cellulose chains on the surface of the crystallites to the amorphous regions, thereby decreasing the close-packed crystallization volume and leading to an increased free volume of the amorphous regions. Subsequently, several supermolecular structures for cotton fibers were successfully controlled to improve the colorfastness in cotton fibers at the molecular level. With the decrease in the degree of crystallinity, more unfixed dyes could be removed by washing reagents, whereas the remaining dyes were mostly fixed to the cotton by covalent bonds, causing a stronger colorfastness, with the best wet rubbing fastness reaching a relatively permanent grade 4. Moreover, the effect mechanism revealed that the unfixed dyes were detached from the cotton fibers according to the reverse process of the adsorption models and that there were additional methods for the unfixed dyes in the fibers to be removed in the presence of triethanolamine than when using pure water. In addition, the binding forces of dye adsorption in the cotton fibers decreased, while the entropy of dye adsorption was higher than that measured when using pure water. Thus, the results suggested that controlling the supermolecular structures of the cotton fibers promoted the removal of unfixed dyes from the fibers and achieved improved colorfastness. © 2017, The Korean Fiber Society and Springer Science+Business Media B.V.

Yu Y.,Jiangxi Normal University | Yu Y.,Key Laboratory of Chemical Biology of Jiangxi Province
Asian Journal of Chemistry | Year: 2014

New series of slightly crosslinked and reactive polycationic dye-fixatives for cotton fabric were synthesized by copolymerization of 3-chloro-2-hydroxypropyltriallyl-ammonium chloride (CHTAAC) and dimethyldiallylammonium chloride. The structures of obtained dye-fixatives could be controlled by varying molar ratios of raw-materials of CHTAAC to DMDAAC during polymerization and their molecular weights were possibly controlled by adjusting different polymerization conditions. The results showed, under the same conditions that the polymerization temperatures were kept at 60 °C for 6 h and then heated to 70 °C for 2 h, when the initial monomer concentrations (w/w) were increased from 40 to 52.5 % and the initiator amount were gradually decreased from 9 to 5 %, a series of slightly crosslinked and reactive polycationic dye-fixatives with 1-5 % molar contents of triallylmethylammonium chloride (TAMAC) units in main chains and controlled intrinsic viscosities of 0.16-0.75 dL/g were successfully synthesized, which were as designed and could be expected as novel useful dye-fixatives for cotton fabric.

Yu Y.-K.,Jiangxi Normal University | Yu Y.-K.,Key Laboratory of Chemical Biology of Jiangxi Province | Zhang Y.-J.,Nanjing University of Science and Technology
Journal of Donghua University (English Edition) | Year: 2015

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 dye-fixing 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. Copyright © 2015 by Editorial Board of Journal of Donghua University, Shanghai China.

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