Preparation and Characterization of Alginate Electrospun Nanofibers

2014 ◽  
Vol 1685 ◽  
Author(s):  
Tae H. Oh ◽  
Young H. Seo ◽  
Jin W. Cha ◽  
Young M. Im ◽  
Jun S. Hwang ◽  
...  
Keyword(s):  
Optimum Condition ◽  
Polyvinyl Alcohol ◽  
Rheological Properties ◽  
Polymer Blend ◽  
Shear Viscosity ◽  
Viscoelastic Properties ◽  
Electrospun Nanofibers ◽  
Blend Ratio ◽  
Property Change

ABSTRACTTo modify the rigid structure of alginate, polyvinyl alcohol was mixed. Rheological properties and viscoelastic properties of the polymer blend solution were investigated. Complex and shear viscosity and tangent delta of the solution were obtained to find optimum condition of spinning dope. Effect of blend ratio on morphology and property change was investigated.

scholarly journals Fabrication and Characterization of Electrospun Poly(acrylonitrile-co-Methyl Acrylate)/Lignin Nanofibers: Effects of Lignin Type and Total Polymer Concentration

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 992
Author(s):  
Suchitha Devadas ◽  
Saja M. Nabat Al-Ajrash ◽  
Donald A. Klosterman ◽  
Kenya M. Crosson ◽  
Garry S. Crosson ◽  
...  
Keyword(s):  
Methyl Acrylate ◽  
Lignin Content ◽  
Polymer Concentration ◽  
Weight Ratio ◽  
Electrospun Nanofibers ◽  
Polymer Content ◽  
Blend Ratio ◽  
Blend Ratios ◽  
Poly Acrylonitrile

Lignin macromolecules are potential precursor materials for producing electrospun nanofibers for composite applications. However, little is known about the effect of lignin type and blend ratios with synthetic polymers. This study analyzed blends of poly(acrylonitrile-co-methyl acrylate) (PAN-MA) with two types of commercially available lignin, low sulfonate (LSL) and alkali, kraft lignin (AL), in DMF solvent. The electrospinning and polymer blend solution conditions were optimized to produce thermally stable, smooth lignin-based nanofibers with total polymer content of up to 20 wt % in solution and a 50/50 blend weight ratio. Microscopy studies revealed that AL blends possess good solubility, miscibility, and dispersibility compared to LSL blends. Despite the lignin content or type, rheological studies demonstrated that PAN-MA concentration in solution dictated the blend’s viscosity. Smooth electrospun nanofibers were fabricated using AL depending upon the total polymer content and blend ratio. AL’s addition to PAN-MA did not affect the glass transition or degradation temperatures of the nanofibers compared to neat PAN-MA. We confirmed the presence of each lignin type within PAN-MA nanofibers through infrared spectroscopy. PAN-MA/AL nanofibers possessed similar morphological and thermal properties as PAN-MA; thus, these lignin-based nanofibers can replace PAN in future applications, including production of carbon fibers and supercapacitors.

Adhesion strength and viscoelastic properties of polydimethylsiloxane (PDMS) based elastomeric nanocomposites with embedded electrospun nanofibers

Soft Matter ◽  
2019 ◽  
Vol 15 (28) ◽  
pp. 5739-5747 ◽  
Author(s):  
Tushar D. Deshpande ◽  
Yogesh R. G. Singh ◽  
Sandip Patil ◽  
Yogesh M. Joshi ◽  
Ashutosh Sharma
Keyword(s):  
Polyvinyl Alcohol ◽  
Adhesion Strength ◽  
Viscoelastic Properties ◽  
Electrospun Nanofibers ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

In the present study, the adhesive and viscoelastic properties of polydimethylsiloxane (PDMS) based nanocomposite pressure sensitive adhesives (PSAs) with embedded electrospun polyacrylonitrile (PAN) and polyvinyl alcohol (PVA) nanofibers as fillers were investigated.

scholarly journals Characterization of Some Spelt Wheat Starches as a Renewable Biopolymeric Material

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Dorota Gałkowska ◽  
Teresa Witczak ◽  
Jarosław Korus ◽  
Lesław Juszczak
Keyword(s):  
Rheological Properties ◽  
Viscoelastic Properties ◽  
Shear Thinning ◽  
Wheat Varieties ◽  
Spelt Wheat ◽  
Physical Chemical ◽  
Pasting Characteristics ◽  
Wheat Starches ◽  
Starch Gels

The aim of this work was to analyze selected physical, chemical, thermal, and rheological properties of starches isolated from different spelt wheat varieties. The analyzed starches contained from 22.5 to 24.6 g/100 g of amylose and from 45.9 to 50.6 mg/100 g of phosphorus. Ranges of characteristic gelatinization temperatures, TO, TP, and TE, were 55.7–58.5°C, 61.1–62.6°C, and 67.4–68.2°C, respectively, while gelatinization enthalpy ranged from 8.87 to 9.96 J/g. The pasting curves showed significant differences in pasting characteristics of the starches. The values of maximum viscosity (ηmax) and viscosity after cooling (η50) determined for the starch pastes were in the range of 82.3–100.7 B.U. and 149.3–172.7 B.U., respectively. The starch pastes demonstrated non-Newtonian, shear thinning flow behaviour and thixotropy phenomenon. After cooling the resulting starch gels were characterized by different viscoelastic properties, with a dominance of elastic features (G′>G′′). The starches exhibited different tendency to retrogradation, with its degree (R=ΔHR/ΔHG) in the range of 21.1–37.4%.

Preparation and characterization of microcellulose reinforced polyvinyl alcohol/starch biocomposites

2018 ◽  
Vol 53 (14) ◽  
pp. 1933-1939 ◽  
Author(s):  
PA Sreekumar ◽  
SK Manirul Haque ◽  
Hafiz Muhammad Afzal ◽  
Zakariya Sadique ◽  
Mamdouh A Al-Harthi
Keyword(s):  
Polyvinyl Alcohol ◽  
Testing Machine ◽  
Crystalline Cellulose ◽  
Blend Ratio ◽  
Thermogravimetric Analyzer ◽  
Particle Size Analyzer ◽  
Starch Blends ◽  
Solution Casting Method ◽  
Olive Industry

This study details about the synthesis of micro-crystalline cellulose prepared from olive pits, the waste material obtained in olive industry, and the effect of these fillers on the tensile and thermal properties of polyvinyl alcohol/starch blends. Micro-crystalline cellulose from olive pits was prepared, and its size was measured using particle size analyzer. Composites were prepared for various micro-crystalline cellulose loading (0, 1, 3, and 5 wt.%) by solution casting method for the blend ratio of 70/30, respectively. Glycerol (3.78 g) was used as plasticizer in all formulations. Universal testing machine, thermogravimetric analyzer, differential scanning calorimeter, X-ray diffractometer, and scanning electron microscopy were used to study the tensile, thermal, and surface morphology of these bio-composites. Results indicated an increase in the tensile properties especially the Young's modulus from 100 to 180 MPa for composites having 1 wt.% of micro-crystalline cellulose and the same formulation showed higher thermal stability.

Production and characterization of catechin-loaded electrospun nanofibers from Azivash gum- polyvinyl alcohol

2020 ◽  
Vol 235 ◽  
pp. 115979 ◽  
Author(s):  
Seyedeh Zahra Hoseyni ◽  
Seid Mahdi Jafari ◽  
Hoda Shahiri Tabarestani ◽  
Mohammad Ghorbani ◽  
Elham Assadpour ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Electrospun Nanofibers

scholarly journals Tunable Photoluminescence of Polyvinyl Alcohol Electrospun Nanofibers by Doping of NaYF4: Eu+3 Nanophosphor

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Sanjeev Kumar ◽  
Garima Jain ◽  
B. P. Singh ◽  
S. R. Dhakate
Keyword(s):  
Polyvinyl Alcohol ◽  
Electrospun Nanofibers ◽  
Excitation Wavelength ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Transmission Microscopy ◽  
Red Emission ◽  
Uniform Dispersion ◽  
Polymeric Nanofibers

NaYF4: Eu+3 nanophosphor/polyvinyl alcohol (PVA) composite nanofibers have been successfully fabricated using the electrospinning technique. The electrospun polymeric nanofibers were characterized by scanning electron microscopy (SEM), high-resolution transmission microscopy (HRTEM), X-ray diffraction (XRD), photoluminescence (PL), and Raman spectroscopy. The flexible polymeric mats exhibited strong red emission at 724 nm at excitation wavelength of 239 nm. 5% concentration of NaYF4: Eu+3 nanophosphor are embedded homogenously inside the PVA matrix. The strong red emission peak attributed to the presence of Eu+3 ions. The characterization of the mats confirmed the uniform dispersion and tunable photoluminescence properties. These photoluminescent nanofibers (PLNs) could be easily fabricated and potentially useful in solid-state lighting applications.

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