A novel eco-friendly imidazole ionic liquids based amphoteric polymers for high performance fatliquoring in chromium-free tanned leather production

Duan, Hao; Wang, Xuechuan; Liu, Xinhua; Zhu, Xing; Sun, Siwei; Ji, Li; Ouyang, Yu

doi:10.1016/j.jhazmat.2020.123048

Cited by 45 publications

(19 citation statements)

References 29 publications

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“…39 Peaks at 2928 cm −1 were due to the symmetric and antisymmetric stretching vibrations of the methylene (–CH 2 –) groups. 40 There were two strong absorption peaks between 1500 cm −1 and 1700 cm −1 , of which the peak at 1665 cm −1 was ascribed to amide I (stretching vibrations of carbonyl in carboxyl) 41 and the one at 1546 cm −1 was the characteristic absorption peak of amide II (C–N–H bending vibration). The peak positions of amide I and amide II are related to its main chain conformation and are less affected by the side chain structure.…”

Section: Resultsmentioning

confidence: 99%

“…This resulted in the reduction of positive charges on the crust leather 47 and lowering of the isoelectric point compared to that of the chrome-tanned leather. 41 Nevertheless, the aluminum tanning agent, which mainly combined with the carboxyl groups of collagen fibers through co-ordinate bonds helped in the recovery of positive charge and balanced the positive and negative charges on the leather. Therefore, the interactions between the EHBP pre-tanned leather and anionic wet finishing materials could be improved.…”

Section: Resultsmentioning

confidence: 99%

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A salt-free pickling and chrome-free tanning technology: a sustainable approach for cleaner leather manufacturing

Liu

Wang

et al. 2022

Green Chem.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A salt-free pickling and chrome-free tanning technology: a sustainable approach for cleaner leather manufacturing

Liu

Wang

et al. 2022

Green Chem.

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“…FTIR spectra of the C–H stretching region (2800–3300 cm −1 ) are shown in Figure 4 d. Ionic liquid is represented by two characteristic peaks of (N)CH 3 at 2979 cm −1 [ 59 ] and C(2)–H 3018 cm −1 [ 60 ], which are present for all samples. The peaks of C–H vibration at ~2921 cm −1 (-CH 3 ) at 2853 cm −1 (-CH 2 -) could be assigned to aliphatic carbon–hydrogen stretching in methyl and methylene groups of NMP [ 61 ] and are not observed for the sample (SPE 160 °C 600 s) [ 62 , 63 , 64 ]. The disappearance of these two peaks could be explained by the removal of NMP in the last sample.…”

Section: Resultsmentioning

confidence: 99%

Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

et al. 2021

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Thermal treatment conditions of solid polymer polymer electrolyte (SPE) were studied with respect to their impact on the surface morphology, phase composition and chemical composition of an imidazolium ionic-liquid-based SPE, namely PVDF/NMP/[EMIM][TFSI] electrolyte. These investigations were done using scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry as well as X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy. A thoroughly mixed blend of polymer matrix, ionic liquid and solvent was deposited on a ceramic substrate and was kept at a certain temperature for a specific time in order to achieve varying crystallinity. The morphology of all the electrolytes consists of spherulites whose average diameter increases with solvent evaporation rate. Raman mapping shows that these spherulites have a semicrystalline structure and the area between them is an amorphous region. Analysis of FTIR spectra as well as Raman spectroscopy showed that the β-phase becomes dominant over other phases, while DSC technique indicated decrease of crystallinity as the solvent evaporation rate increases. XPS and ToF-SIMS indicated that the chemical composition of the surface of the SPE samples with the highest solvent evaporation rate approaches the composition of the ionic liquid.

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“…Applied results of the amphoteric polymer on the fatliquoring and dyeing process of chrome‐free leather indicate that the absorptive rate of dyestuff and fatliquor is more than 96% and the prepared amphoteric polymer shows excellent assistant‐dyeing property and ensures better absorption of the fatliquor and dyestuff. With the concept of environmental protection deeply rooted in the people's minds, Wang et al firstly used polymerizable imidazole type ionic liquid as polymerization monomer to prepare an environment‐friendly amphoteric fatliquor 52 . As shown in Figure 10.…”

Section: Application Of Amphoteric Materials In Leathermentioning

confidence: 99%

“…(A) Synthetic route of imidazole type amphoteric fatliquor; (B) SEM images of unfatliquored and fatliquored leather; (C) Comparison of dye solution and crust leather before and after dyeing; (D) AFM micrographs of unfatliquored and fatliquored leather. Reprinted with permission from Reference 52. Copyright 2020, Elsevier…”

Section: Application Of Amphoteric Materials In Leathermentioning

confidence: 99%

Amphoteric functional polymers for leather wet finishing auxiliaries: A review

Wang

Liu

et al. 2021

Polymers for Advanced Techs

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Amphoteric functional polymers containing anionic and cationic groups have the advantages of pH‐responsive function, self‐assembly, and anti‐polyelectrolyte effect, which have been diffusely applied in the healthcare industry, leather area, and so forth. Very recently, with the development of organic chrome‐free tanned ecological leather manufacturing technology, the anionic retanning and fatliquoring agents for traditional chrome tanning system have gradually lost their dominant position due to the weak interactions between positively charged collagen fibers and negatively charged wet finishing auxiliaries, resulting in a series of problems such as low dye uptake, uneven dyeing, and so forth. To address this issue, recent researches have been devoted to developing amphoteric polymers for leather retanning and fatliquoring processes. In this review, we give a comprehensive overview of the preparation and application of amphoteric materials for leather retanning and fatliquoring agents. With the perspective of their properties, current challenges, and outlook in the future, crafting functional and environmentally friendly amphoteric materials are further put forward. The development and application of amphoteric polymer wet finishing auxiliaries will greatly promote the integrated manufacturing of ecological leather, and further motivate the upgrading, transformation, and sustainable development of the traditional leather industry.

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A novel eco-friendly imidazole ionic liquids based amphoteric polymers for high performance fatliquoring in chromium-free tanned leather production

Cited by 45 publications

References 29 publications

A salt-free pickling and chrome-free tanning technology: a sustainable approach for cleaner leather manufacturing

A salt-free pickling and chrome-free tanning technology: a sustainable approach for cleaner leather manufacturing

Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

Amphoteric functional polymers for leather wet finishing auxiliaries: A review

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