Physicomechanical Characterization of Poly(acrylic acid-co-acrylamide) Hydrogels Reinforced with TEMPO-oxidized Blue Agave Cellulose Nanofibers

Martínez-Salcedo, Silvia Lizeth; Torres-Rendon, Jose Guillermo; García-Enriquez, Salvador; Anzaldo-Hernández, José; Silva-Guzmán, José Antonio; Muñiz, Graciela Inés Bolzón de; Lomelí-Ramírez, María Guadalupe

doi:10.1007/s12221-022-4643-9

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…As shown the FTIR spectra in Figure b, there is a broad band around 3450 cm –1 corresponding to the −OH stretching vibration in both un-oxidized and oxidized porous materials. Moreover, a new peak appears at 1720 cm –1 attributing to CO stretching vibration, which indicates the successful conversion of d -glucose hydroxyl to carboxyl . Meanwhile, with the increase of oxidation degree, the peak strength becomes stronger for the higher content of the conversed carboxyl.…”

Section: Resultsmentioning

confidence: 94%

“…Moreover, a new peak appears at 1720 cm −1 attributing to C� O stretching vibration, which indicates the successful conversion of D-glucose hydroxyl to carboxyl. 37 Meanwhile, with the increase of oxidation degree, the peak strength becomes stronger for the higher content of the conversed carboxyl. In the XPS analysis in Figure 5d,e,g, there are C3 peak at 287.5 eV, C2 peak at 286 eV, and C1 peak at 284 eV, corresponding to C�O, C−O, and C−C structures in the WPM, respectively.…”

Section: Structure and Morphology Of The Wooden Electromechanical Con...mentioning

confidence: 99%

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Anisotropic Wooden Electromechanical Transduction Devices Enhanced by TEMPO Oxidization and PDMS

Jiang

Cao

et al. 2023

ACS Omega

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In order to increase the number and contact probability of electric dipole on cellulose, acid and alkali treatment was employed to extract hemicellulose and lignin from original wood to gain a highly oriented cellulose frame. The combined means with 2,2,6,6-tetramethylpiperidine-1-oxyl–NaBr–NaClO oxidation and impregnation of PDMS with compression was subsequently used to enhance its mechanical performance and electromechanical conversion. The assembled wooden electromechanical device (10 mm × 10 mm × 1 mm) exhibits the maximum open-circuit voltage (V OC) of 11.75 V and short-circuit current (I SC) of 211.01 nA as stepped by foot. It can be sliced to fabricate a flexible sensor with high sensitivity displaying V OC of 2.88 V and I SC of 210.09 nA under the tapped state. Its highly oriented wood fiber makes it display significant anisotropy in terms of mechanical and electromechanical performance for multidirectional sense. This strategy will exactly provide reference for developing other high-performance piezoelectric devices.

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Section: Resultsmentioning

confidence: 94%

Section: Structure and Morphology Of The Wooden Electromechanical Con...mentioning

confidence: 99%

Anisotropic Wooden Electromechanical Transduction Devices Enhanced by TEMPO Oxidization and PDMS

Jiang

Cao

et al. 2023

ACS Omega

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“…The synthesis of new hydrogel structures based on synthetic polymers and polysaccharides has been the subject of numerous studies. The most commonly used polysaccharides include chitosan [10,11], alginate [9,[12][13][14], starch [15][16][17], cellulose [18], carboxymethylcellulose [19,20], hyaluronic acid [21], etc. These biopolymers have several desirable features, such as being abundant, inexpensive, renewable, biodegradable, polyfunctional, highly reactive chemically, and possessing a wide variety of properties as well as adsorption capacities [15,22,23].…”

Section: Introductionmentioning

confidence: 99%

Structure Effects on Swelling Properties of Hydrogels Based on Sodium Alginate and Acrylic Polymers

Kowalski,

Witczak,

Kuterasiński

2024

Molecules

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Hydrogels based on sodium alginate (SA) and partially neutralised poly(acrylic acid) were obtained by radical polymerisation. The hydrogels were cross-linked with N,N′-methylenebisacrylamide (MBA), simultaneously grafting the resulting polymer onto SA. The findings of the FTIR spectroscopy showed that all of the hydrogels were effectively synthesized and sodium alginate was chemically bonded with the poly(sodium acrylate) matrix. DSC analysis of the melting heat and glass transition parameters indicated that the hydrogel structure had changed as a result of the cross-linking process. Sodium alginate and MBA were tested at different concentrations to determine how they affected the hydrogel properties. A very high content of the biopolymer, i.e., sodium alginate, was used in our research, up to 33 wt%. This resulted in durable and stable hydrogels with a very high ability to uptake water, comparable to hydrogels based on synthetic polymers only. The ability to swell is inversely proportional to the quantity of MBA present. By increasing the amount of sodium alginate in the hydrogel, the ability of the hydrogel to absorb water is reduced. However, water uptake remains relatively high at 350 g·g−1, even for the hydrogel with the highest SA content.

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“…In the last decade, efforts have focused on exploiting A. tequilana bagasse. The high cellulose content of A. tequilana bagasse, close to 80% [ 17 , 18 ], allows the production of high-added-value by-products, such as CNCs [ 19 , 20 , 21 ] and CNFs [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch Biocomposite Films Reinforced with Nanocellulose from Agave tequilana Weber var. Azul Bagasse

Lomelí-Ramírez,

Reyes-Alfaro,

Martínez-Salcedo

et al. 2023

Polymers

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In this work, cellulose nanocrystals (CNCs), bleached cellulose nanofibers (bCNFs), and unbleached cellulose nanofibers (ubCNFs) isolated by acid hydrolysis from Agave tequilana Weber var. Azul bagasse, an agro-waste from the tequila industry, were used as reinforcements in a thermoplastic starch matrix to obtain environmentally friendly materials that can substitute contaminant polymers. A robust characterization of starting materials and biocomposites was carried out. Biocomposite mechanical, thermal, and antibacterial properties were evaluated, as well as color, crystallinity, morphology, rugosity, lateral texture, electrical conductivity, chemical identity, solubility, and water vapor permeability. Pulp fibers and nanocelluloses were analyzed via SEM, TEM, and AFM. The water vapor permeability (WVP) decreased by up to 20.69% with the presence of CNCs. The solubility decreases with the presence of CNFs and CNCs. The addition of CNCs and CNFs increased the tensile strength and Young’s modulus and decreased the elongation at break. Biocomposites prepared with ubCNF showed the best tensile mechanical properties due to a better adhesion with the matrix. Images of bCNF-based biocomposites demonstrated that bCNFs are good reinforcing agents as the fibers were dispersed within the starch film and embedded within the matrix. Roughness increased with CNF content and decreased with CNC content. Films with CNCs did not show bacterial growth for Staphylococcus aureus and Escherichia coli. This study offers a new theoretical basis since it demonstrates that different proportions of bleached or unbleached nanofibers and nanocrystals can improve the properties of starch films.

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Physicomechanical Characterization of Poly(acrylic acid-co-acrylamide) Hydrogels Reinforced with TEMPO-oxidized Blue Agave Cellulose Nanofibers

Cited by 6 publications

References 39 publications

Anisotropic Wooden Electromechanical Transduction Devices Enhanced by TEMPO Oxidization and PDMS

Anisotropic Wooden Electromechanical Transduction Devices Enhanced by TEMPO Oxidization and PDMS

Structure Effects on Swelling Properties of Hydrogels Based on Sodium Alginate and Acrylic Polymers

Thermoplastic Starch Biocomposite Films Reinforced with Nanocellulose from Agave tequilana Weber var. Azul Bagasse

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