Surface functionalization of cellulose nanocrystals with polymeric ionic liquids during phase transfer

Huang, Shuohan; Wang, Xinhang; Shen, Jiahao; Wu, R. T.-P.; Zhao, Hualei; Wang, Yanping; Wang, Yimin; Xia, Yueyuan

doi:10.1016/j.carbpol.2016.11.024

Cited by 21 publications

(7 citation statements)

References 25 publications

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“…Compared with MCNC_BD, the intensity of band at 1751 cm –1 decreased in the spectrum of MCNC_AD, due to the elimination of free carboxylic groups from citric acid and hydrolytically cleavage of ester groups during dialysis (absence of free carboxylic groups in MCNC_AD will be also further confirmed by TGA analysis). The bands in MCNC_AD spectrum raised in the range of 1222 cm –1 (IV) to 1030 cm –1 (V), which are related to ether bond (COC) stretching, (COH) and pyranose ring (COC) vibration of CNCs, gave further proof for formation of ester linkages . The absorbance at 3400 cm –1 (not shown) was ascribed to OH stretching, while the absorption at 1640 cm –1 (II) was related to adsorbed water molecules in CNC .…”

Section: Results and Discussionmentioning

confidence: 96%

“…The bands in MCNC_AD spectrum raised in the range of 1222 cm −1 (IV) to 1030 cm −1 (V), which are related to ether bond (COC) stretching, (COH) and pyranose ring (COC) vibration of CNCs, gave further proof for formation of ester linkages. 59 The absorbance at 3400 cm −1 (not shown) was ascribed to OH stretching, while the absorption at 1640 cm −1 (II) was related to adsorbed water molecules in CNC. 60 These two typical signals for hydroxyl groups decreased in the MCNC_BD spectrum, when compared to the CNC spectrum, owing to hydroxyl groups blocking by reaction with citric acid.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Citric Acid as Green Modifier for Tuned Hydrophilicity of Surface Modified Cellulose and Lignin Nanoparticles

Luzi

Yang

et al. 2018

ACS Sustainable Chem. Eng.

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This paper proposes one straightforward route for citric acid modification of two different lignocellulosic products, cellulose nanocrystals (CNC) and lignin nanoparticles (LNP). Modified cellulose nanocrystals (MCNC) and lignin nanoparticles (MLNP) were characterized by means of Fourier Transform Infrared Spectroscopy (FT-IR), 13 C and 1 H nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet− visible/near-infrared (UV−vis/NIR) spectrometry and thermogravimetric analysis (TGA). The reaction mechanism between citric acid and both CNC and LNP was discussed. The resultant MCNC exhibited improved dispersion in polar solvents, better thermal stability as compared with CNC while, in the case of LNP, a slight increase in thermal stability and alteration of MLNP dispersibility in polar solvents were proved. These results confirmed how esterified (MCNC) and etherified (MLNP) biobased nanoparticles with tuned hydrophilicity, obtained by a treatment with a low cost, sustainable and easily soluble cross-linker, have potential for widespread applicability in the field of polymeric based nanocomposites having different polarity.

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Section: Results and Discussionmentioning

confidence: 96%

Section: ■ Results and Discussionmentioning

confidence: 99%

Citric Acid as Green Modifier for Tuned Hydrophilicity of Surface Modified Cellulose and Lignin Nanoparticles

Luzi

Yang

et al. 2018

ACS Sustainable Chem. Eng.

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“…50 The dark control (Figure 7A-iv) showed significant differences compared to the control gel (Figure 7A-iii), indicating vanadium coordination. The stretch at 1073 cm −1 , which can be attributed to the C−O−C vibration of the pyranose ring backbone, 51 showed much lower intensity in the dark control. Moreover, the stretch at 1149 cm −1 , which was attributed to the C−O antisymmetric vibration, 49 disappeared in the dark control.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Controlled Delivery and Photopatterning of Mechanical Properties in Polysaccharide Hydrogels Using Vanadium Coordination and Photochemistry

Edirisinghe

Haddad

Ostrowski

2022

ACS Appl. Bio Mater.

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Incorporation of the transition metal ion V(V) into hydrogels has been used to impart photoresponsive behavior, which was used to tune materials properties during light irradiation. The photoreaction in QHEcellulose/agarose hydrogels coordinated with vanadium was evidenced by a clear color change of yellow to blue through a green intermediate. This color change was attributed to the reduction of V(V) to V(IV) as described in our previous work. A concomitant oxidative breakdown of the polysaccharide chain was noticeable upon the reduction of V(V) with a decrease in stiffness (G′) of the hydrogel material. This reduction of the metal ion and breakdown of polysaccharide chain induced irreversible changes in the microstructure of the hydrogel, enabling the controlled delivery of V(IV) and/or encapsulated cargo. Scanning electron microscopy studies showed an increase in pore sizes and guest cavity formation during irradiation. In addition to the significant drop in mechanical properties like storage and loss modulus in the gel materials, a viscosity drop in the polymer solution was observed through irradiation, indicating breakdown of the polysaccharide chain. A photomask can be used to create discrete patterns on these materials upon irradiation.

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“…Due to tight van der Waals interactions and intramolecular and intermolecular hydrogen-bonding networks, cellulose is chemically stable, structurally rigid, and insoluble in water or common organic solvents [103][104][105][106][107][108][109][110][111]. The recalcitrance of cellulose is a bottleneck that affects its sustainability and cost-effective utilization for the conversion of cellulosic biomass into key platform chemicals.…”

Section: Pretreatment Technologies For Decreasing Rigid Structure Of mentioning

confidence: 99%

Chemocatalytic Conversion of Cellulose into Key Platform Chemicals

Liu

et al. 2018

International Journal of Polymer Science

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Chemocatalytic transformation of lignocellulosic biomass to value-added chemicals has attracted global interest in order to build up sustainable societies. Cellulose, the first most abundant constituent of lignocellulosic biomass, has received extensive attention for its comprehensive utilization of resource, such as its catalytic conversion into high value-added chemicals and fuels (e.g., HMF, DMF, and isosorbide). However, the low reactivity of cellulose has prevented its use in chemical industry due to stable chemical structure and poor solubility in common solvents over the cellulose. Recently, homogeneous or heterogeneous catalysis for the conversion of cellulose has been expected to overcome this issue, because various types of pretreatment and homogeneous or heterogeneous catalysts can be designed and applied in a wide range of reaction conditions. In this review, we show the present situation and perspective of homogeneous or heterogeneous catalysis for the direct conversion of cellulose into useful platform chemicals.

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Surface functionalization of cellulose nanocrystals with polymeric ionic liquids during phase transfer

Cited by 21 publications

References 25 publications

Citric Acid as Green Modifier for Tuned Hydrophilicity of Surface Modified Cellulose and Lignin Nanoparticles

Citric Acid as Green Modifier for Tuned Hydrophilicity of Surface Modified Cellulose and Lignin Nanoparticles

Controlled Delivery and Photopatterning of Mechanical Properties in Polysaccharide Hydrogels Using Vanadium Coordination and Photochemistry

Chemocatalytic Conversion of Cellulose into Key Platform Chemicals

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