scholarly journals One-Pot Process: Microwave-Assisted Keratin Extraction and Direct Electrospinning to Obtain Keratin-Based Bioplastic

2021 ◽  
Vol 22 (17) ◽  
pp. 9597
Author(s):  
Elena Pulidori ◽  
Simone Micalizzi ◽  
Emilia Bramanti ◽  
Luca Bernazzani ◽  
Celia Duce ◽  
...  
Keyword(s):  
Barrier Properties ◽  
Tensile Tests ◽  
Extraction Yield ◽  
Attenuated Total Reflection ◽  
Conventional Heating ◽  
Uniaxial Tensile ◽  
Scanning Calorimetry ◽  
One Pot ◽  
Microwave Assisted ◽  
Poultry Feathers

Poultry feathers are among the most abundant and polluting keratin-rich waste biomasses. In this work, we developed a one-pot microwave-assisted process for eco-friendly keratin extraction from poultry feathers followed by a direct electrospinning (ES) of the raw extract, without further purification, to obtain keratin-based bioplastics. This microwave-assisted keratin extraction (MAE) was conducted in acetic acid 70% v/v. The effects of extraction time, solvent/feathers ratio, and heating mode (MAE vs conventional heating) on the extraction yield were investigated. The highest keratin yield (26 ± 1% w/w with respect to initial feathers) was obtained after 5 h of MAE. Waste-derived keratin were blended with gelatin to fabricate keratin-based biodegradable and biocompatible bioplastics via ES, using 3-(Glycidyloxypropyl)trimethoxysilane (GPTMS) as a cross-linking agent. A full characterization of their thermal, mechanical, and barrier properties was performed by differential scanning calorimetry, thermogravimetric analysis, uniaxial tensile tests, and water permeability measurements. Their morphology and protein structure were investigated using scanning electron microscopy and attenuated total reflection-infrared spectroscopy. All these characterizations highlighted that the properties of the keratin-based bioplastics can be modulated by changing keratin and GPTMS concentrations. These bioplastics could be applied in areas such as bio-packaging and filtration/purification membranes.

scholarly journals Poly(furfuryl alcohol)-Polycaprolactone Blends

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1069 ◽  
Author(s):  
Gabriele Nanni ◽  
José A. Heredia-Guerrero ◽  
Uttam C. Paul ◽  
Silvia Dante ◽  
Gianvito Caputo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Furfuryl Alcohol ◽  
Barrier Properties ◽  
Tensile Tests ◽  
Attenuated Total Reflection ◽  
Toxicity Tests ◽  
Scanning Calorimetry ◽  
Blend Films ◽  
Force Microscopy ◽  
Atomic Force

Poly(furfuryl alcohol) (PFA) is a bioresin synthesized from furfuryl alcohol (FA) that is derived from renewable saccharide-rich biomass. In this study, we compounded this bioresin with polycaprolactone (PCL) for the first time, introducing new functional polymer blends. Although PCL is biodegradable, its production relies on petroleum precursors such as cyclohexanone oils. With the method proposed herein, this dependence on petroleum-derived precursors/monomers is reduced by using PFA without significantly modifying some important properties of the PCL. Polymer blend films were produced by simple solvent casting. The blends were characterized in terms of surface topography by atomic force microscopy (AFM), chemical interactions between PCL and PFA by attenuated total reflection-Fourier transform infrared (ATR-FTIR), crystallinity by XRD, thermal properties by differential scanning calorimetry (DSC), and mechanical properties by tensile tests and biocompatibility by direct and indirect toxicity tests. PFA was found to improve the gas barrier properties of PCL without compromising its mechanical properties, and it demonstrated sustained antioxidant effect with excellent biocompatibility. Our results indicate that these new blends can be potentially used in diverse applications ranging from food packing to biomedical devices.

Improved Protocols for Microwave-Assisted Cu(I)-Catalyzed Huisgen 1,3-Dipolar Cycloadditions

2007 ◽  
Vol 72 (8) ◽  
pp. 1014-1024 ◽  
Author(s):  
Pedro Cintas ◽  
Katia Martina ◽  
Bruna Robaldo ◽  
Davide Garella ◽  
Luisa Boffa ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Microwave Irradiation ◽  
Ultrasound Irradiation ◽  
Conventional Heating ◽  
Dipolar Cycloaddition ◽  
One Pot ◽  
Click Reactions ◽  
Dipolar Cycloadditions ◽  
Microwave Assisted ◽  
New Applications

The Huisgen 1,3-dipolar cycloaddition of azides and acetylenes catalyzed by Cu(I) salts, leading to 1,2,3-triazoles, is one of the most versatile "click reactions". We have developed a series of optimized protocols and new applications of this reaction starting from several substrates, comparing heterogeneous vs homogeneous catalysis, conventional heating vs microwave irradiation or simultaneous microwave/ultrasound irradiation. Both non-conventional techniques strongly promoted the cycloaddition (bromide → azide → triazole), that could be conveniently performed in a one-pot procedure. This was feasible even with such bulky molecules as functionalized β-cyclodextrins (β-CD), starting from 61-O-tosyl-β-CD or from heptakis[6-O-(tert-butyldimethylsilyl)]-21-O-propargyl-β-CD. "Greener" heterogeneous catalysis with charcoal-supported Cu(II) or Cu(I) (prepared under ultrasound) was advantageously employed.

Characterization of PLA/TPU composite filaments manufactured for 3D printing with FDM

2021 ◽  
pp. 089270572110625
Author(s):  
Ajay Jayswal ◽  
Sabit Adanur
Keyword(s):  
3D Printing ◽  
Fused Deposition Modeling ◽  
Thermoplastic Polyurethane ◽  
Tensile Tests ◽  
Optical Microscope ◽  
Mechanical Analysis ◽  
Uniaxial Tensile ◽  
Scanning Calorimetry ◽  
Fused Deposition ◽  
3D Printed

Polylactic acid (PLA) and thermoplastic polyurethane (TPU) were mixed in different proportions and extruded through twin-screw and single-screw extruders to obtain composite filaments to be used for 3D printing with fused deposition modeling (FDM) method. The properties of the filaments were characterized using uniaxial tensile tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), rheology, polarized optical microscope (POM), and scanning electron microscope (SEM). 3D printed samples from composite filaments were tested using dynamic mechanical analysis (DMA). It was found that the tensile strength and modulus of the filaments decrease while elongation at break increases with the increasing TPU content in the composite. The analysis also showed a partial miscibility of the polymer constituents in the solution of composite filaments. Finally, a flexible structure, plain weave fabric, was designed and 3D printed using the composite filaments developed which proved that the filaments are well suited for 3D printing.

scholarly journals Influence of additives on physico-chemical properties of electrospun poly(L-lactide)

2018 ◽  
Vol 4 (1) ◽  
pp. 493-496 ◽  
Author(s):  
Daniela Arbeiter ◽  
Stefanie Kohse ◽  
Thomas Eickner ◽  
Nils Grabow ◽  
Klaus-Peter Schmitz
Keyword(s):  
Formic Acid ◽  
Chemical Properties ◽  
Tensile Tests ◽  
Morphological Properties ◽  
Uniaxial Tensile ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Fiber Matrices ◽  
Plla Fiber ◽  
Triton X

AbstractElectrospun poly(L-lactide) (PLLA) nonwoven represent potential options for biodegradable medical implants. They can be manufactured with high reproducibility and do offer the potential for chemical modification to alter matrix properties. In our study, we investigate the mechanical, thermal and morphological properties of PLLA fiber matrices. Fibrous nonwovens were fabricated from polymer solution by needle electrospinning. The polymer solutions were loaded with Triton X-100 (TX- 100), formic acid and tetraethyl ammonium chloride (TEAC) with respect to polymer weight. Morphology of the PLLA nonwoven scaffolds was examined with SEM. We performed uniaxial tensile tests and differential scanning calorimetry (DSC). Different concentrations of the additives TEAC, formic acid and Triton X-100 lead to strong changes regarding mechanical and thermal properties of the electrospun PLLA fiber matrices. In comparison with mechanical properties of established biological tissue materials, the results indicate the suitability for medical applications.

Microwave-assisted solvent-free synthesis of 3,4-dihydropyrimidin-2(1H)-ones catalyzed by NH4OBr

2011 ◽  
Vol 76 (8) ◽  
pp. 989-995 ◽  
Author(s):  
Davood Azarifar ◽  
Kaveh Khosravi ◽  
Khadijeh Soleimani ◽  
Zohreh Najminejad
Keyword(s):  
Condensation Reaction ◽  
Solvent Free ◽  
Conventional Heating ◽  
One Pot ◽  
Keto Ester ◽  
Microwave Assisted ◽  
Catalytic Potential ◽  
Reaction Proceeds ◽  
The One ◽  
Solvent Free Synthesis

Catalytic potential of ammonium hypobromite in the one-pot synthesis of 3,4-dihydropyrimidin-2(1H)-ones from Biginelli-type condensation reaction between an aldehyde, β-keto ester and urea has been explored. The reaction proceeds under solvent-free conventional heating as well as microwave-irradiation conditions to afford the respective products in excellent yields.

scholarly journals The Influence of Kaolin Clay on the Mechanical Properties and Structure of Thermoplastic Starch Films

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 73
Author(s):  
Anita Kwaśniewska ◽  
Dariusz Chocyk ◽  
Grzegorz Gładyszewski ◽  
Jarosław Borc ◽  
Michał Świetlicki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Composite Films ◽  
Diffraction Method ◽  
Barrier Properties ◽  
Thermoplastic Starch ◽  
Nanoindentation Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Scanning Calorimetry

The aim of study was to investigate the influence of kaolin on the physical properties and utility of film produced from native starch. The work involved measurements of strength, structure, and thermal properties. The films were prepared by the casting method. Composite films with 0%, 5%, 10%, and 15% kaolin additives were examined. Measurements of mechanical properties were carried out using the uniaxial tensile test, the nanoindentation test, and nanoscratching. Surface properties were examined by atomic force microscopy and contact angle measurements. Structure was determined by the X-ray diffraction method, and thermal properties were determined by differential scanning calorimetry. A significant influence of kaolin on the strength parameters and thermal and barrier properties of composite films was found. An increase in kaolin content reduced the tensile strength, Young’s modulus, and Poisson’s ratio. Structural analysis showed a partial intercalation and the layered arrangement of kaolin particles. Kaolin additives increased the barrier properties of water vapor in composite films of about 9%. Biopolymer modification by nanoclay reduced the thermal stability of composite films by 7% and could accelerate the biodegradation process. Increasing the concentration of kaolin in the biopolymer matrix led to heightened surface roughness (approximately 64%) and wettability of the surfaces of the film composites of 58%.

scholarly journals Properties of Biodegradable Films Based on Poly(butylene Succinate) (PBS) and Poly(butylene Adipate-co-Terephthalate) (PBAT) Blends

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2317
Author(s):  
Anna Raffaela de Matos Costa ◽  
Andrea Crocitti ◽  
Laura Hecker de Carvalho ◽  
Sabrina Carola Carroccio ◽  
Pierfrancesco Cerruti ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Water Vapor Permeability ◽  
Sharp Decrease ◽  
Barrier Properties ◽  
Tensile Tests ◽  
Sem Analysis ◽  
Vapor Permeability ◽  
Biodegradable Films ◽  
Scanning Calorimetry ◽  
Butylene Succinate

Compression molded biodegradable films based on poly(butylene succinate) (PBS) and poly(butylene adipate-co-terephthalate) (PBAT) at varying weights were prepared, and their relevant properties for packaging applications are here reported. The melt rheology of the blends was first studied, and the binary PBS/PBAT blends exhibited marked shear thinning and complex thermoreological behavior, due to the formation of a co-continuous morphology in the 50 wt% blend. The films were characterized by infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), mechanical tensile tests, scanning electron microscopy (SEM), and oxygen and water vapor permeability. PBS crystallization was inhibited in the blends with higher contents of PBAT, and FTIR and SEM analysis suggested that limited interactions occur between the two polymer phases. The films showed increasing stiffness as the PBS percentage increased; further, a sharp decrease in elongation at break was noticed for the films containing percentages of PBS greater than 25 wt%. Gas permeability decreased with increasing PBS content, indicating that the barrier properties of PBS can be tuned by blending with PBAT. The results obtained point out that the blend containing 25 wt% PBS is a good compromise between elastic modulus (135 MPa) and deformation at break (390%) values. Overall, PBS/PBAT blends represent an alternative for packaging films, as they combine biodegradability, good barrier properties and reasonable mechanical behavior.

scholarly journals Microwave-assisted synthesis of 2,8-di(alkyl/aryl)-4,6-dichloro-2H,8H-pyrano[3,2-g] chromene-3,7-dicarbaldehydes and their antimicrobial activity

2019 ◽  
Vol 84 (4) ◽  
pp. 355-364
Author(s):  
Rupireddy Venkataramana ◽  
Venkata Chittireddy ◽  
Dongamanti Ashok ◽  
Kudle Rao
Keyword(s):  
Antimicrobial Activity ◽  
Pathogenic Bacteria ◽  
Aromatic Aldehydes ◽  
Conventional Heating ◽  
Microwave Assisted Synthesis ◽  
Good Activity ◽  
One Pot ◽  
Alkyl Aryl ◽  
Microwave Assisted ◽  
Bacteria And Fungi

A series of 2,8-di(alkyl/aryl)-substituted bischromanone derivatives were synthesized in one pot from 4,6-diacetylresorcinol and aliphatic/aromatic aldehydes in the presence of pyrrolidine/piperidine under conventional heating and microwave irradiation. The 2,8-di(alkyl/aryl)-substituted bischromanones were converted into a new series of 4,6-dichloro-3,7-diformyl-2,8-di(alkyl/aryl)-substituted bischromenes using the Vilsmeier?Haack reagent. The structures of the compounds were established based on elemental analysis, IR, 1H-NMR, 13C- -NMR and LC?MS spectral data. All the synthesized compounds were evaluated for their antimicrobial activity. Some of the compounds showed very good activity compared to standard drugs against all the tested pathogenic bacteria and fungi.

Microwave-assisted one-pot synthesis and antimicrobial evaluation of 2-(1-phenyl-3-(2-thienyl)-1H-pyrazol-4-yl)chroman-4-one derivatives

2016 ◽  
Vol 22 (5) ◽  
Author(s):  
Ashok Dongamanti ◽  
Hayder Hasan Naji ◽  
Vijaya Lakshmi Bommidi ◽  
Sarasija Madderla
Keyword(s):  
Antimicrobial Activity ◽  
Microwave Irradiation ◽  
Conventional Heating ◽  
One Pot ◽  
Microwave Assisted ◽  
Hybrid Compounds ◽  
One Pot Synthesis ◽  
Synthetic Strategy ◽  
Antimicrobial Evaluation

AbstractNew hybrid compounds containing flavanone and pyrazoline motifs were synthesized by microwave irradiation and conventional heating methods using one-pot synthetic strategy. The products were evaluated for their antimicrobial activity.

Microwave-assisted one-pot synthesis of pyrimido［4,5-b］quinolines derivatives

2013 ◽  
Vol 30 (6) ◽  
pp. 636-642
Author(s):  
Xueli Zhang ◽  
Zhilan Lin ◽  
Huiling Hu ◽  
Jiaxin He ◽  
Yuan Gao
Keyword(s):  
One Pot ◽  
Microwave Assisted ◽  
One Pot Synthesis
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