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Leilei Wu,Yiwen Ren,Xueming Bao,Ping Wang,Man Zhou,Man Zhou,Qiang Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
Generally, Bombyx mori silk dyeing is performed using acid dyes. However, the color fastness is alwaysunsatisfactory due to the weak binding forces under neutral conditions. In the present work, graft polymerization of α-lipoicacid (ALA) onto silk fibers was carried out using a two-step method. Briefly, ALA was grafted onto the silk fibers, followedby a reduction-oxidation process to form poly(α-lipoic acid) (PALA) on the fiber surfaces, aiming at improving theelectronegativity of fiber surface and realizing cationic dyeing. The results implied that the combined treatments promotedthe intermolecular crosslinking between fibroin chains, endowing the silk fiber with low zeta potential simultaneously. A thinsedimentary layer on the fiber surfaces was observed for the PALA-deposited silk fibers, companying with a significantincrease in the content of sulfur and O/N ratio, which verified the successful graft polymerization. The modified silk fabricexhibited improved dyeability, and the dyeing depth and color fastness was noticeably higher compared to that of theuntreated after cationic dyeing. Meanwhile, the newly-built intermolecular disulfide crosslinks imparted a detectable antiwrinkleeffect to the silk fabric. This study provides a facile strategy for modification of silk fabric with improved dyeingbehaviors and physical properties.
Qiwei Yang,Huabin Xing,Kun Yu,Baogen Su,Zongbi Bao,Yiwen Yang,Qilong Ren 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Chloride anion-based ionic liquids (ILs) have unique importance among various ILs. Nevertheless, they are usually very viscous, and the study on their mixtures with molecular solvent is important for their practical application. In this work, the viscosities and conductivities of the binary mixtures of 1-butyl-3-methylimidazolium chloride and several protic/aprotic solvents were measured, and the underlying information about intermolecular interaction and microscopic structure was discussed. The result showed that the molecular solvents which have relatively high dielectric constant and hydrogen-bond acidity will be more efficient in promoting the dissociation of chloride anion-based ILs and improving the transport properties of corresponding applications.
Liyun Kong,Zhiguo Zhang,Huabin Xing,Qiwei Yang,Baogen Su,Zongbi Bao,Yiwen Yang,Qilong Ren 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
Polyethylene glycol (PEG) esters are important, nontoxic and biodegradable non-ionic surfactants. A keyprocedure in producing PEG esters is their separation from unreacted or excess acids. We propose an adsorptionmethod using the weakly basic anion exchange resins for the separation of organic acids and PEG esters for the firsttime. With α-tocopheryl polyethylene glycol succinate (TPGS) and α-tocopheryl succinate (α-TS) as the examples ofPEG ester and organic acid, respectively, single-component equilibrium experiments revealed the great potential of thismethod. Studies on the adsorption equilibrium, thermodynamics and kinetics of α-TS onto a weakly basic anion exchangeresin were also carried out. This research is not only important for the production of TPGS, but also instructivefor the separation of other PEG-esters from the reaction mixtures.
Min Li,Minhui Huang,Zhiguo Zhang,Qiwei Yang,Yiwen Yang,Zongbi Bao,Qilong Ren 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10
L-arabinose and D-galactose could be released during the hydrolysis process of Arabic gum. The development of a crystallization process of L-arabinose is highly dependent on the knowledge of the solubility of both saccharides. In this work, the solubility of L-arabinose and D-galactose in binary mixtures of methanol-water or ethanolwater (mole fraction of water 0.5816) was determined at temperatures between 278.15 and 333.15K by a static equilibrium method. The experimental data correlated well with the modified Apelblat equation, the simplified polynomial empirical equation, NRTL model and UNIQUAC model. Additionally, the thermodynamic properties including the dissolution enthalpy and entropy were obtained from the experimental data. Within the studied temperature range, the dissolution is endothermic and the dissolution process is non-spontaneous.