Recent advances in green hydrogels from lignin: a review

Thakur, Vijay Kumar; Thakur, Manju Kumari

doi:10.1016/j.ijbiomac.2014.09.044

Cited by 523 publications

(237 citation statements)

References 61 publications

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“…[1] The soft mechanics, capacity for rapid internal diffusion of water-soluble components, tunable interfacial affinity for target molecules, and capacity for environmentally responsive physicochemical changes, all controllable based on the crosslink density and chemistry of the hydrogel, make hydrogels highly relevant for biomedical, [1][2][3] bioseparations, [4][5][6] environmental, [7][8][9] and personal care applications, [10,11] among others. Biomedical applications including tissue engineering, [12] drug delivery, [13] and cell encapsulation [14] can particularly benefit from the properties of hydrogels, as hydrogels can effectively mimic the interfacial, chemical, mechanical, and biological functions of native extracellular matrix (ECM).…”

Section: Introductionmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

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Structured macroporous hydrogels that have controllable porosities on both the nanoscale and the microscale offer both the swelling and interfacial properties of bulk hydrogels as well as the transport properties of “hard” macroporous materials. While a variety of techniques such as solvent casting, freeze drying, gas foaming, and phase separation have been developed to fabricate structured macroporous hydrogels, the typically weak mechanics and isotropic pore structures achieved as well as the required use of solvent/additives in the preparation process all limit the potential applications of these materials, particularly in biomedical contexts. This review highlights recent developments in the field of structured macroporous hydrogels aiming to increase network strength, create anisotropy and directionality within the networks, and utilize solvent‐free or additive‐free fabrication methods. Such functional materials are well suited for not only biomedical applications like tissue engineering and drug delivery but also selective filtration, environmental sorption, and the physical templating of secondary networks.

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Section: Introductionmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

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“…The chemical structure of lignin is sometimes difficult to define, given that its structure and properties largely depend on the isolation process and the source type used for its extraction (Agrawal et al 2014;Gordobil et al 2014;Thakur and Thakur 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of Desulfonation of Lignosulfonate on the Properties of Poly(Lactic Acid)/Lignin Composites

Ye¹,

Zhang²,

Yu³

2017

BioResources

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To utilize the lignin generated by the paper industry and reduce the cost of poly(lactic acid) (PLA), PLA/lignin composites were prepared from PLA and different ratios of lignosulfonate (LS) or desulfonated lignosulfonate (DLS) particles using a casting method. The physicochemical properties of the lignins were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), gel permeation-high performance liquid chromatography (GPC), and elementary analysis. The results indicate that the sulfur content of the original LS was successfully reduced to half by desulfonation to produce DLS, which was found to have a higher thermal stability and a lower average molecular weight than LS. Additionally, the thermal stability, crystallization, compatibility, mechanical, hydrophobicity, and optical properties of the PLA/lignin composites were also meticulously evaluated. Comparison of the PLA/DLS and PLA/LS composites revealed that the incorporation of DLS into PLA improved compatibility, thermal stability (T5% and Tmax), and hydrophobicity, while the mechanical properties remained almost unchanged. In addition, both PLA/DLS and PLA/LS exhibited UV light absorption capacity. Finally, the low-rate addition of both LS (10%) and DLS (5%) accelerated the crystallization of PLA, but crystallization was delayed with higher lignin content.

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“…For many years, lignin has been investigated as antioxidant [20][21][22] and as compatibilizer [20,23] because of a large number of polar functional groups. Moreover, lignin presents a good capacity to adsorb hazardous metal ions [24,25] and is a source to prepare precursors for carbon-based materials, such as activated carbon or carbon fibers [26] and may be used as a starting material for hydrogel applications [27,28].…”

Section: Introductionmentioning

confidence: 99%

Nucleation ability of advanced functional silica/lignin hybrid fillers in polypropylene composites

Borysiak

Kłapiszewski

Bula

et al. 2016

J Therm Anal Calorim

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Novel advanced functional silica/lignin hybrid fillers were synthesized for the purpose of their application in composites with polypropylene. The use of lignin for the production of hybrid fillers is justified due to the advantages such as reduction in cost of products, improvement in biodegradability as well as antioxidant and antimicrobial properties. The study encompasses an analysis of the dispersive and morphological properties of the hybrid fillers, and investigations of phase transitions and the supermolecular structure of the composites by means of differential scanning calorimetry, polarized light microscopy, and X-ray diffractometry. The nucleation activity of the hybrid fillers was found to be strongly correlated with the chemical composition of the fillers, and their dispersive properties and porous structure characteristics. Furthermore, the particle size and area surface of the hybrid fillers play an important role in the development of polymorphic varieties of the polypropylene matrix. The study also discusses the mechanism of the formation of the b-PP variety and the transcrystalline structure in the context of the nucleation ability of the hybrid fillers. The investigations are very significant because they address the impact of the actual physicochemical parameters of the hybrid fillers on the nucleation ability and structure of composite materials.

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Recent advances in green hydrogels from lignin: a review

Cited by 523 publications

References 61 publications

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Effect of Desulfonation of Lignosulfonate on the Properties of Poly(Lactic Acid)/Lignin Composites

Nucleation ability of advanced functional silica/lignin hybrid fillers in polypropylene composites

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