A one-step approach to make cellulose-based hydrogels of various transparency and swelling degrees

Geng, Hongjuan

doi:10.1016/j.carbpol.2018.01.031

Cited by 55 publications

(36 citation statements)

References 42 publications

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“…The mechanical property is important for the practical utilization of the hydrogel materials, which has also been tested, taking the reported method [44] as reference. As shown in Figure 6, with increasing the concentration of the MBA in the solution, the compression strength was increased from 36 to 103 kPa.…”

Section: The Compression Properties Of the Cross-linking Agent Treatementioning

confidence: 99%

Cellulose hydrogel skeleton by extrusion 3D printing of solution

Yang

Kang

et al. 2020

Nanotechnology Reviews

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AbstractCellulose is the most abundant natural polymer on earth, which has obtained increasing interest in the field of functional materials development for its renewable, high mechanical performance and environmental benign. In this study, the traditional processing method (wet spinning and film production) of cellulose-based materials was applied by using cellulose solution for 3D printing, which can directly build complex 3D patterns. Herein, a natural cellulose is dissolved in an effective mixed aqueous solution of dimethyl sulfoxide (DMSO) and tetrabutylammonium hydroxide (TBAH). The cellulose solution extrusion was controlled by a modified fused deposition modeling (FDM) 3D printer. During the controlled extrusion 3D printing process, the viscous cellulose solution will gelifies and further solidifies into a predetermined 3D pattern at room temperature in air. Subsequently, a cellulose hydrogel skeleton was obtained, when the 3D pattern was solvent-exchanged with deionized water. Finally, the mechanical and swelling performance of the cellulose hydrogel scaffold was improved by a cross-linking agent treatment method. With treatment of the 3D printed scaffolds in 0.8 wt% cross-linking agent solution, the obtained cellulose hydrogel could absorb 28 g/g water, and the compression strength was 96 kPa. This work provided an efficient way to prepare natural cellulose hydrogel by 3D printing under room temperature.

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Section: The Compression Properties Of the Cross-linking Agent Treatementioning

confidence: 99%

Cellulose hydrogel skeleton by extrusion 3D printing of solution

Yang

Kang

et al. 2020

Nanotechnology Reviews

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“…Nevertheless, this value is lower than that for hydrogels formed from the related NaOH/urea system, ca. 330g/g [4]. This difference is most likely related to the cellulose type used; the cellulose pulp used in this work has a much higher molecular weight than the one used in previoulsy reported NaOH/urea system.…”

Section: Swelling Of the Cellulose Hydrogelsmentioning

confidence: 85%

“…Among the vast list of possible applications, cellulose-based hydrogels have recently attracted great attention due to their numerous advantages, such as hydrophilicity, renewability, biodegradability, biocompatibility, low cost and non-toxicity [3][4][5]. Hydrogels are often defined as cross-linked polymer networks capable of absorbing significant amounts of fluids while maintaining their tridimensional structural integrity.…”

Section: Introductionmentioning

confidence: 99%

“…In this respect, Yuan et al has presented a pioneering work where robust hydrogels were prepared from solutions of unmodified cellulose in NaOH/urea and further crosslinked with MBA without the need for any initiator or high energy inputs [56]. Following that work, Geng has recently shown the possibility of developing unmodified cellulose-based hydrogels and aerogels with various degrees of transparency and swelling ability, from NaOH/urea at room temperature using MBA [4,43].Due to the high demand of simple, efficient, inexpensive and "green" technologies to produce cellulose hydrogels, in this work we revisit a cold alkali-based system based on the LiOH/urea mixture. This is an innovative approach, since to our knowledge, this direct cellulose solvent has not been used before for the formation of unmodified cellulose hydrogels chemically crosslinked with MBA.…”

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Simple One Pot Preparation of Chemical Hydrogels from Cellulose Dissolved in Cold LiOH/Urea

et al. 2020

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In this work, non-derivatized cellulose pulp was dissolved in a cold alkali solution (LiOH/urea) and chemically cross-linked with methylenebisacrylamide (MBA) to form a robust hydrogel with superior water absorption properties. Different cellulose concentrations (i.e., 2, 3 and 4 wt%) and MBA/glucose molar ratios (i.e., 0.26, 0.53 and 1.05) were tested. The cellulose hydrogel cured at 60 • C for 30 min, with a MBA/glucose molar ratio of 1.05, exhibited the highest water swelling capacity absorbing ca. 220 g H 2 O/g dry hydrogel. Moreover, the data suggest that the cross-linking occurs via a basic Michael addition mechanism. This innovative procedure based on the direct dissolution of unmodified cellulose in LiOH/urea followed by MBA cross-linking provides a simple and fast approach to prepare chemically cross-linked non-derivatized high-molecular-weight cellulose hydrogels with superior water uptake capacity.Polymers 2020, 12, 373 2 of 15 enhance their potentials for applications, affect their release profiles and even allow specific processing, such as their injection [19]. In this respect, the mechanical and flow properties cannot be neglected when judging the feasibility of a hydrogel for a specific biological application. For instance, suitable flow properties allow hydrogels to be exciting candidates as injectable therapeutic delivery carriers if they are capable of shear-thinning during application at a proper shear stress; rapid self-healing; and adopting a solid-like behavior once the stress is removed [20].The general processing of cellulose, including the hydrogel formation, is challenging, since the biopolymer does not dissolve in water or in common organic solvents. Cellulose dissolution requires the disruption of the relatively extended inter-and intramolecular hydrogen bond network within its structure, as well as the van der Waals and hydrophobic interactions among the less polar faces of the anhydroglucose units [21][22][23][24].It is thus not surprising that for cellulose-based hydrogels the majority of studies have mainly focused on systems involving cellulose derivatives that can be easily dissolved in aqueous media [3,5,25,26]. Some studies have focused on physical hydrogels from several cellulose derivatives [27,28], while chemical cross-linking is more commonly used [3]. In this respect, chemically crosslinked cellulose-based hydrogels have been prepared using different methodologies, such as esterification [29], and radical and graft polymerization [30,31]. Methods involving free-radical initiation using an initiator compound or a high energy irradiation source, such as microwaves, γ-rays or glow discharge by electrolysis plasma, have also been suggested [29,[32][33][34][35][36][37][38][39]. Most of these processes involve time-consuming procedures requiring large quantities of chemicals, which make the post-treatment challenging. Consequently, these are generally expensive and poorly efficient strategies [32].Chemical cross-linking overcomes the problem of poor robustness of physical hydro...

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Controllable synthesis of cellulose/methylene bisacrylamide aerogels for enhanced adsorption performance

Song

Zhou

et al. 2020

J of Applied Polymer Sci

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Cellulose‐based aerogels have been regarded as potential adsorbent materials because of their unique structural features and chemical stability. Herein, we prepared the composite aerogels containing cellulose and N,N′‐methylene bisacrylamide (MBA) using N‐methylmorpholine‐N‐oxide (NMMO) as a green solvent via a freeze‐drying process. Owing to the strong chemical interaction between CC bonds of MBA and the functional groups of cellulose, as‐obtained cellulose/MBA aerogels present favorable MBA‐induced thermal/mechanical stable three‐dimensional network structure, in which the abundant macroporous structure, low density and high porosity lead to a significantly enhanced adsorption capacity (260.31 mg∙g−1) toward congo red dye in aqueous solution compared with the pure cellulose aerogels. Moreover, the effect of the cellulose concentration and cross‐linking degree on the morphology and adsorption properties for cellulose/MBA aerogels was systematically investigated. This present work provides a low‐cost and environmental‐friendly synthesis method for designing the functionalization of cellulose‐based aerogel, which may be achieved the advanced performance in wastewater treatment.

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A one-step approach to make cellulose-based hydrogels of various transparency and swelling degrees

Cited by 55 publications

References 42 publications

Cellulose hydrogel skeleton by extrusion 3D printing of solution

Cellulose hydrogel skeleton by extrusion 3D printing of solution

Simple One Pot Preparation of Chemical Hydrogels from Cellulose Dissolved in Cold LiOH/Urea

Controllable synthesis of cellulose/methylene bisacrylamide aerogels for enhanced adsorption performance

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