scholarly journals Preparation of an Asymmetric Membrane from Sugarcane Bagasse Using DMSO as Green Solvent

2019 ◽  
Vol 9 (16) ◽  
pp. 3347 ◽  
Author(s):  
Nu ◽  
Hung ◽  
Hoang ◽  
Van der Bruggen
Keyword(s):  
Cellulose Acetate ◽  
Sugarcane Bagasse ◽  
Raw Material ◽  
Cellulose Derivatives ◽  
Asymmetric Membrane ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Force Microscopy ◽  
Cellulose Acetate Membranes ◽  
High Degree

Asymmetric cellulose acetate membranes have been successfully fabricated by phase inversion, using sugarcane bagasse (SB) as the starting material. SB is a raw material with high potential to produce cellulose derivatives due to its structure and morphology. Cellulose was extracted from SB by pretreatment with solutions of 5 wt% NaOH, 0.5 wt% EDTA; then bleached with 2 wt% H2O2. Cellulose acetate (CA) was prepared by the reaction between extracted cellulose with acetic anhydride, and H2SO4 as a catalyst. The obtained CA exhibited a high degree of substitution (2.81), determined with 1H-NMR spectroscopy and titration. The functional groups and thermal analysis of the extracted cellulose and the synthesized CA have been investigated by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The change in the crystallinity of the extracted cellulose and CA was evaluated by X-ray diffraction (XRD) spectroscopy. Asymmetric membranes were fabricated using dimethyl sulfoxide (DMSO) as the solvent, with a casting thickness of 250 µm. The obtained membranes were studied by scanning electron microscopy (SEM), DSC and atomic force microscopy (AFM). The hydrophilicity of the membranes was evaluated, as demonstrated by the measurement of water contact angle (WCA) and water content. Furthermore, the antifouling properties of membranes were also investigated.

Development of leftover rice/gelatin interpenetrating polymer network films for food packaging

2021 ◽  
Vol 10 (1) ◽  
pp. 37-48
Author(s):  
Sijia Li ◽  
Chun Shao ◽  
Zhikun Miao ◽  
Panfang Lu
Keyword(s):  
Food Packaging ◽  
Polymer Network ◽  
Raw Material ◽  
Interpenetrating Polymer Network ◽  
Waste Biomass ◽  
Practical Application ◽  
Water Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Morphology Of Films

Abstract Waste biomass can be used as a raw material for food packaging. Different concentrations of gelatin (GEL) were introduced into the leftover rice (LR) system to form an interpenetrating polymer network (IPN) for improving the properties of the films. The structure and morphology of films were evaluated by Fourier transform infrared, scanning electron microscopy, and atomic force microscopy, which showed good compatibility between LR and GEL. The moisture content and oil absorption rate of IPN films were down by 105% and 182%, respectively, which showed better water and oil resistance than the LR film. In addition, increasing GEL concentration led to enhancement in the tensile strength of films from 2.42 to 11.40 MPa. The water contact angle value of the IPN films (117.53°) increased by 147% than the LR film (47.56°). The low haze of IPN films was obtained with the increment of the mutual entanglement of LR and GEL. The 30–50% GEL addition improved the water vapor barrier and thermal stability properties of the IPN films. This study highlights that LR as waste biomass can have a practical application in food packaging.

SEM study of the morphology of asymmetric cellulose acetate membranes produced from recycled agro-industrial residues: sugarcane bagasse and mango seeds

2010 ◽  
Vol 66 (3) ◽  
pp. 377-389 ◽  
Author(s):  
Moacir Fernandes Ferreira Júnior ◽  
Elaine Angélica Ribeiro Mundim ◽  
Guimes Rodrigues Filho ◽  
Carla da Silva Meireles ◽  
Daniel Alves Cerqueira ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Sugarcane Bagasse ◽  
Industrial Residues ◽  
Cellulose Acetate Membranes ◽  
Sem Study

scholarly journals Nanocomposite Film Based on Cellulose Acetate and Lignin-Rich Rice Straw Nanofibers

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 595 ◽  
Author(s):  
Mohammad Hassan ◽  
Linn Berglund ◽  
Ragab Abou-Zeid ◽  
Enas Hassan ◽  
Wafaa Abou-Elseoud ◽  
...  
Keyword(s):  
Contact Angle ◽  
Cellulose Acetate ◽  
Rice Straw ◽  
Water Vapor Permeability ◽  
Light Transmittance ◽  
Vapor Permeability ◽  
Water Contact ◽  
Transparent Films ◽  
Force Microscopy ◽  
Good Transparency

Nanofibers isolated from unbleached neutral sulfite rice straw pulp were used to prepare transparent films without the need to modify the isolated rice straw nanofibers (RSNF). RSNF with loading from 1.25 to 10 wt.% were mixed with cellulose acetate (CA) solution in acetone and films were formed by casting. The films were characterized regarding their transparency and light transmittance, microstructure, mechanical properties, crystallinity, water contact angle, porosity, water vapor permeability, and thermal properties. The results showed good dispersion of RSNF in CA matrix and films with good transparency and homogeneity could be prepared at RSNF loadings of less than 5%. As shown from contact angle and atomic force microscopy (AFM) measurements, the RSNF resulted in increased hydrophilic nature and roughness of the films. No significant improvement in tensile strength and Young’s modulus was recorded as a result of adding RSNF to CA. Addition of the RSNF did not significantly affect the porosity, crystallinity and melting temperature of CA, but slightly increased its glass transition temperature.

scholarly journals Use of sweet sorghum bagasse (Sorghum bicolor (L.) Moench) for cellulose acetate synthesis

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 3534-3553
Author(s):  
José M. da Silva Neto ◽  
Líbia de S. C. Oliveira ◽  
Flávio L. H. da Silva ◽  
José N. Tabosa ◽  
José G. A. Pacheco ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Cellulose Triacetate ◽  
Point Of View ◽  
Raw Material ◽  
Sodium Chlorite ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sorghum Bagasse ◽  
Chemical Inputs ◽  
Sorghum Bicolor L

The objective of this work was to synthesize cellulose acetate from sorghum bagasse, a promising raw material for the production of chemical inputs, both from a photosynthetic point of view and the maturation speed compared with that of sugarcane. The bagasse was treated with hydrogen peroxide, and then cellulose was isolated using sodium chlorite, acetic acid, and sodium hydroxide. The cellulose was subjected to an acetylation reaction, from which cellulose triacetate was obtained. By means of statistical analysis, it was observed that the conditions that generated the highest solubilization of lignin (62%) and higher yield from cellulose extraction (39.5%) were 60 °C, a 6% peroxide concentration, and 4 h. Cellulose acetate was obtained with a degree of substitution of 3.66 at 25 °C and 24 h. Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry, differential thermogravimetry, and differential scanning calorimetry analyses confirmed that the obtained cellulose presented specific characteristics of this material. Also, the reaction of acetylation was confirmed through these techniques.

Preparation and properties of silane-modified cardanol–benzoxazine for hydrophobic coating

2020 ◽  
pp. 009524432093398
Author(s):  
Wenzheng Zhang ◽  
Ning Jiang ◽  
Tingting Zhang ◽  
Tinghao Zhang
Keyword(s):  
Char Yield ◽  
Raw Material ◽  
Advanced Technology ◽  
Proton Nuclear Magnetic Resonance ◽  
Polymerization Reaction ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Coating Application ◽  
Cashew Nut

Cardanol is a kind of green industrial raw material, refined from cashew nut shell oil by advanced technology, which has shown potential for anticorrosion coating application. A new cardanol-based benzoxazine monomer (CB) was synthesized by Mannich condensation of a cardanol, paraformaldehyde, and cardanol aldehyde amine (Carala), which was prepared based on cardanol, paraformaldehyde, and triethylenetetramine, and finally, the cardanol-based benzoxazines containing amino group were modified by silane (CBSi). Cardanol, Carala, and CB were characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. Furthermore, the cured films have been evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. The result of DSC of CB and CBSi showed that curing behavior of CBSi was similar to that of CB; however, the enthalpy of polymerization reaction corresponding to CB and CBSi is 84.7 J g−1 and 91.3 J g−1, respectively, and exothermic enthalpy of CBSi is slightly higher than that of CB. TGA results illuminated that the thermal stability and char yield of cardanol-based polybenzoxazine could be enhanced due to increment of silane, and residual char yield at 700°C of CBSi30 is 13%. Especially, incorporation of silane could improve the water contact angle, which can increase from 78.7° to 98.9° when the ratio of γ-(2,3-epoxypropoxy) propytrimethoxysilane to CB increases from 0% to 30%.

scholarly journals Synthesis of Silica Particles from Sugarcane Bagasse Ash for Its Application in Hydrophobic Coatings

2020 ◽  
Vol 2 (1) ◽  
pp. 4
Author(s):  
Jesús A. Pérez-Casas ◽  
Antonio A. Zaldívar-Cadena ◽  
Anabel Álvarez-Mendez ◽  
Juan Jacobo Ruiz-Valdés ◽  
Salomé M. de la Parra-Arciniega ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Sugarcane Bagasse ◽  
Building Materials ◽  
Contact Angles ◽  
Silica Particles ◽  
Raw Material ◽  
Molar Ratio ◽  
Future Application ◽  
Water Contact ◽  
Sugarcane Bagasse Ash

: Wastes such as sugarcane bagasse ash (SCBA) can be used as raw material in ceramics by the elaboration of bricks and tiles and the glass industry, due the high amount of silica in its composition (>70%). Another application for SCBA is the synthesis of metallic silicates. In this work, we study the synthesis of sodium silicate with SCBA as the main raw material and the future application of sodium silicate for the preparation of silica particles in order to create hydrophobic surfaces for ceramic materials to prevent their erosion. The sodium silicate synthesis was carried out by the thermochemical method with batches of ash and sodium carbonate in a 1:1 sodium oxide–silicon oxide molar ratio. The thermal treatment was in an electric furnace at 800 °C for 8 h. Then, for the synthesis of the silica particles, the sodium silicate was dissolved in water, and then we added methanol in a 3:2 water methanol volume ratio. The solution was left to age for an hour to create the Si-OH bond. Finally, tetraethylorthosilicate (TEOS) was added and the solution was stirred for 2 h to create a hydrophobic and hydrolytically resistant siloxane by the displacement of H in the Si-OH bond. The application of the solution was by the spray-coating method over substrates of concrete and red clay with the application of 10, 15, and 20 layers. The hydrophobicity was evaluated with the water contact angle test, with the results of contact angles above the 110°, thus demonstrating the capacity of a waste for the generation of coatings to prolong the useful life of building materials.

scholarly journals Functionalized Electrospun Fibers for the Design of Novel Hydrophobic and Anticorrosive Surfaces

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 300 ◽  
Author(s):  
Pedro Rivero ◽  
David Yurrita ◽  
Carlos Berlanga ◽  
José Palacio ◽  
Rafael Rodríguez
Keyword(s):  
Corrosion Resistance ◽  
Metal Oxide Nanoparticles ◽  
Chemical Vapor ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Force Microscopy ◽  
Hydrophobic Molecule ◽  
High Degree

In this work, a novel coating was deposited on aluminum alloy samples by using a combination of electrospinning and chemical vapor deposition (CVD-silanization) techniques in order to create a functionalized film with an enhancement of both corrosion resistance and hydrophobicity. The electrospinning technique makes the fabrication of highly crosslinked electrospun fibers possible by the combination of both poly(acrylic acid) and β-cyclodextrin, respectively, which can be easily functionalized in a further step by using the CVD-silanization process due to the evaporation of a hydrophobic molecule such as 1H,1H,2H,2H-Perflurodecyltriethoxysilane. In addition, the resultant electrospun fibers with a high degree of insolubility have been successfully fabricated and metal oxide nanoparticles (TiO2NPs) have been incorporated into the electrospun polymeric solution in order to improve the corrosion protection. The surface morphology has been determined by using light optical microscopy, atomic force microscopy, scanning electron microscopy, and water contact angle (WCA) measurements. The corrosion resistance has been evaluated by using both potentiodynamic polarization and pitting corrosion tests. Finally, the results related to WCA measurements after CVD-silanization corroborate that the surfaces have been successfully functionalized with a hydrophobic behavior in comparison with the electrospinning process, showing a considerable difference in the roughness.

scholarly journals N-acylhydrazone Derivative-Loaded Cellulose Acetate Films: Thermoanalytical, Spectroscopic, Mechanical and Morphological Characterization

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2345
Author(s):  
Amaro César Lima de Assis ◽  
Lívia Maria Coelho de Carvalho Moreira ◽  
Beatriz Patrício Rocha ◽  
Milena Raissa Bezerra Pereira ◽  
Demis Ferreira de Melo ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Average Diameter ◽  
Morphological Characterization ◽  
Mechanical Tests ◽  
Spectroscopic Techniques ◽  
Cellulose Derivatives ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Synthetic Materials ◽  
Dsc Analyses

Cellulose acetate (ACT) is one of the most important cellulose derivatives due to its biodegradability and low toxicity, presenting itself as one of the main substitutes for synthetic materials in the development of wound dressing films. The incorporation of a N-acylhydrazonic derivative (JR19), with its promising anti-inflammatory activity, may represent an alternative for the treatment of skin wounds. This work aims to develop and to physicochemically and mechanically characterize ACT films containing JR19. The films were prepared using the ‘casting’ method and further characterized by thermoanalytical and spectroscopic techniques. In addition, mechanical tests and morphological analysis were performed. Thermogravimetry (TG) and differential scanning calorimetry (DSC) analyses showed that the thermal events attributed to excipients and films were similar, indicating the absence of physical incompatibilities between ACT and JR19. Infrared spectroscopy showed that JR19 was incorporated into ACT films. The characteristic band attributed to C≡N (2279 to 2264 cm−1) was observed in the spectra of JR19, in that of the physical mixture of JR19/ACT, and, to a lesser extent, in the spectra of JR19 incorporated into the ACT film, suggesting some interaction between JR19 and ACT. X-ray diffraction (XRD) evidenced the suppression of the crystallinity of JR19 (diffraction peaks at 8.54°, 12.80°, 14.09°, 16.08°, 18.19°, 22.65°, 23.59°, 24.53°, 25.70°, 28.16° and 30.27°2θ) after incorporation into ACT films. The mechanical tests indicated the adequate integrity of the films and their resistance to bending. The morphological characterization showed JR19 crystals along with a homogeneously distributed porous structure throughout the surface of the films with an average diameter of 21.34 µm and 22.65 µm of the films alone and of those incorporating JR19F, respectively. This study was able to characterize the ACT films incorporating JR19, showing their potential to be further developed as wound healing dressings.

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