scholarly journals Preparation and characterization of new hydrogels based on poly(vinyl alcohol)/phosphoester — chondroitin sulphate

2013 ◽  
Vol 11 (3) ◽  
pp. 446-456
Author(s):  
Tachita Vlad-Bubulac ◽  
Diana Serbezeanu ◽  
Ana-Maria Oprea ◽  
Ionela-Daniela Carja ◽  
Corneliu Hamciuc ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Chondroitin Sulphate ◽  
Moisture Sorption ◽  
Kinetic Studies ◽  
Surface Characteristics ◽  
Poly Vinyl Alcohol ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ft Ir

AbstractAbstract New polymer hydrogels based on partially phosphorylated poly(vinyl alcohol) (PVA/Phosphoester) have been prepared. Fourier transform infrared spectroscopy (FT-IR) was employed to confirm PVA/Phosphoester formation. Contact angle measurements were performed to evaluate the surface characteristics of the hydrogels. The PVA/Phosphoester hydrogels were co-networked with Chondroitin sulfate (CS) in various ratios by chemical crosslinking. The synthetic-natural mixed resulted semi-IPN hydrogels were structurally and morphologically investigated by ATR — FT-IR spectroscopy and scanning electron microscopy, respectively. The swelling behavior and dynamic moisture sorption capacity of the PVA/Phosphoester (p-methyl-phenyl phosphonic dichloride) (P3)-CS semi-IPN hydrogels were followed. It was found that the performance of the semi-IPN hydrogels was influenced by the CS. By kinetic studies, it has been shown that the swelling processes occurred by an anomalous transport mechanism. Graphical abstract

Gelatin-Glutaradehyde-Poly(Vinyl Alcohol) Bioadsorbent: Synthesis, Characterization and Application for Copper(II) Ion Removal from Synthetic Aqueous Solution

2008 ◽  
Vol 569 ◽  
pp. 217-220 ◽  
Author(s):  
Xue Gang Luo ◽  
Feng Liu ◽  
Xiao Yan Lin ◽  
Jian Zhou
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Freundlich Isotherm ◽  
Poly Vinyl Alcohol ◽  
Isotherm Equation ◽  
Ion Removal ◽  
Adsorption Data ◽  
Initial Ph ◽  
Ft Ir

A new Gelatin-glutaradehyde-Poly(vinyl alcohol) bioadsorbent was synthesized by immobilizing Poly(vinyl alcohol) onto gelatin followed by cross-linking. This technique gives the bioadsorbent of gelatin good chemical resistance and mechanical strength. SEM and FT-IR were conducted for characterization of the bioadsrobent. A comprehensive adsorption study of Copper(II) removal from synthetic aqueous solution by adsorption on this bioadsorbent was conducted regarding the effects of initial pH, time, and copper(II) initial concentration. The adsorption data were applied to Freundlich isotherm equation and its contents were calculated. The results obtained showed that the new absorbent has good performance for the removal of copper(II).

Preparation and Characterization of PVA/Boron Polymer Produced by an Electrospinning Technique.

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
I. Uslu ◽  
H. Daştan ◽  
A. Altaş ◽  
A. Yayli ◽  
O. Atakol ◽  
...  
Keyword(s):  
Boron Oxide ◽  
Vinyl Alcohol ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Boron Addition ◽  
Electrospinning Technique ◽  
Boron Doped ◽  
Ft Ir ◽  
Pva Solutions

Abstract In this study, poly(vinyl alcohol) were cross-linked with boron in varying concentrations and blend fibers were obtained with diameters ranging from 0.3 μ to 4.0 μm with the use of electrospinning process. The resulting product was characterized by SEM, DSC, and FT-IR techniques. There is no beading tendency in either boron doped or undoped fibers. When the amount of boric acid in PVA solutions was increased the conductivity of the polymer decreased. The data indicated the existence of boron oxide in the polymeric structure and the formation of B-O-C bond. SEM micrographs reveal that higher viscosity favors the formation of thicker fibers. Boron addition seems to disturb the easy detachment of the fibers from the tip of the Taylor Cone

scholarly journals Development and Characterization of a Poly (Vinyl Alcohol)/Graphene Oxide Composite Hydrogel as An Artificial Cartilage Material

2018 ◽  
Vol 8 (11) ◽  
pp. 2272 ◽  
Author(s):  
Yibo Zhao ◽  
Wataru Terai ◽  
Yuko Hoshijima ◽  
Kazuma Gotoh ◽  
Koji Matsuura ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Cell Attachment ◽  
Tensile Tests ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
Sem Images ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Surface Contact Angle

Poly (vinyl alcohol) hydrogel (PVA-H) is expected to be a suitable artificial articular cartilage material because of its high biocompatibility. However, it is difficult to affix to the surface of a living joint because it is bioinert and its mechanical strength needs to be improved. In this study, graphene oxide (GO) subjected to two oxidation rounds was used to form a nanocomposite material and the composite hydrogel PVA-GO-H was prepared by low-temperature crystallization. Scanning electron microscope (SEM) images showed that the addition of GO can increase roughness of the hydrogel surface. Contact angle measurements showed that the surface of PVA-GO-H exhibited hydrophobicity that increased with GO concentration and not with that of PVA-H, indicating that the hydrophilic parts of PVA and GO form hydrogen bonds and the hydrophobic part of GO was exposed on the surface. Tensile tests demonstrated that Young’s modulus was enhanced on the addition of GO. Osteoblast cells showed more affinity for PVA-GO-H than PVA-H, which much more cells adhere to than to PVA-GO-H after a certain period of culturing, suggesting GO can improve the cell attachment of PVA-H. Further studies on the influence of the oxidation time of GO are still required.

scholarly journals Preparation and Characterization of Chitosan/Poly(Vinyl Alcohol) Blended Films: Mechanical, Thermal and Surface Investigations

2011 ◽  
Vol 8 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Esam A. El-Hefian ◽  
Mohamed Mahmoud Nasef ◽  
Abdul Hamid Yahaya
Keyword(s):  
Contact Angle ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Elongation At Break ◽  
Angle Measurements ◽  
Static Water Contact Angle ◽  
Contact Angle Measurements ◽  
Static Water

In this study, blends of chitosan (CS) and polyvinyl alcohol (PVA) (CS/PVA) having various proportions were prepared and characterized by universal mechanical tester, the differential scanning calorimetry (DSC) and contact angle measurements. Studying the mechanical properties of the films showed that blending improved the tensile strength, which increased with increasing PVA content up to 40% while the elongation% at break of the blends was decreased compared to that of the pure components. The obtained results of DSC suggested that some interaction between chitosan and PVA mostly took place. Static water contact angle measurements showed an improvement in the wettability of the obtained films.

Preparation and characterization of poly(vinyl alcohol)/gum tragacanth/cellulose nanocomposite film

2021 ◽  
pp. 50672
Author(s):  
Majid Alizadeh Moghadam ◽  
Reza Mohammadi ◽  
Ehsan Sadeghi ◽  
Mohammad Amin Mohammadifar ◽  
Mohammad Nejatian ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Nanocomposite Film ◽  
Poly Vinyl Alcohol ◽  
Gum Tragacanth

scholarly journals Equilibrium, Thermodynamic, Reuse, and Selectivity Studies for the Bioadsorption of Lanthanum onto Sericin/Alginate/Poly(vinyl alcohol) Particles

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 623
Author(s):  
Talles Barcelos da Costa ◽  
Meuris Gurgel Carlos da Silva ◽  
Melissa Gurgel Adeodato Vieira
Keyword(s):  
Vinyl Alcohol ◽  
Economic Value ◽  
Poly Vinyl Alcohol ◽  
Thermodynamic Quantities ◽  
High Demand ◽  
Batch System ◽  
Equilibrium Data ◽  
Selectivity Studies ◽  
Amorphous Character

In a scenario of high demand, low availability, and high economic value, the recovery of rare-earth metals from wastewater is economically and environmentally attractive. Bioadsorption is a promising method as it offers simple design and operation. The aim of this study was to investigate lanthanum bioadsorption using a polymeric bioadsorbent of sericin/alginate/poly(vinyl alcohol)-based biocomposite. Batch system assays were performed to evaluate the equilibrium, thermodynamics, regeneration, and selectivity of bioadsorption. The maximum capture amount of lanthanum at equilibrium was 0.644 mmol/g at 328 K. The experimental equilibrium data were better fitted by Langmuir and Dubinin–Radushkevich isotherms. Ion exchange mechanism between calcium and lanthanum (2:3 ratio) was confirmed by bioadsorption isotherms. Thermodynamic quantities showed that the process of lanthanum bioadsorption was spontaneous (−17.586, −19.244, and −20.902 kJ/mol), endothermic (+15.372 kJ/mol), and governed by entropic changes (+110.543 J/mol·K). The reusability of particles was achieved using 0.1 mol/L HNO3/Ca(NO3)2 solution for up to five regeneration cycles. The bioadsorbent selectivity followed the order of lanthanum > cadmium > zinc > nickel. Additionally, characterization of the biocomposite prior to and post lanthanum bioadsorption showed low porosity (9.95 and 12.35%), low specific surface area (0.054 and 0.019 m2/g), amorphous character, and thermal stability at temperatures up to 473 K. This study shows that sericin/ alginate/poly(vinyl alcohol)-based biocomposites are effective in the removal and recovery of lanthanum from water.

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