Crosslinked poly(vinyl alcohol) hydrogels for wound dressing applications: A review of remarkably blended polymers

Kamoun, Elbadawy A.; Chen, Xin; Eldin, M.S. Mohy; Kenawy, El‐Refaie

doi:10.1016/j.arabjc.2014.07.005

Cited by 555 publications

(241 citation statements)

References 70 publications

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“…24 PVA is considered as one of the oldest and most frequently used synthetic polymers with good biocompatibility properties. 25 In order to enhance the antibacterial activity of dressing mats against both drug-sensitive and drug-resistant pathogenic bacteria, Lee et al incorporated silver nanoparticles (AgNPs) into a blend of chitosan and PVA polymeric mats. 26 The fibers showed a strong antibacterial inhibitory effect on Escherichia coli and Staphylococcus aureus because of the AgNPs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and antimicrobial properties of novel double layer nanocomposite electrospun fibers for wound dressing applications

Hassiba

Zowalaty

Webster

et al. 2017

IJN

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and antimicrobial properties of novel double layer nanocomposite electrospun fibers for wound dressing applications

Hassiba

Zowalaty

Webster

et al. 2017

IJN

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“…Por outro lado, os hidrogéis reticulados fisicamente são resultados de interações não--covalentes em nível molecular, podendo ser formados por interações iônicas e ligação de hidrogênio entre as cadeias. 6,7 Dentre as diversas caracterizações a serem realizadas na área de hidrogéis, a propriedade hidrofílica é a mais importante. Sendo assim, sua capacidade de absorver água ou fluído está relacionada com os grupos hidrofílicos presentes em sua estrutura.…”

Section: Introductionunclassified

Polysaccharide-Based Nanocomposite Hydrogels With Zeolite: Evaluation of the Sorption Process of Pesticide Paraquat

2018

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PARAQUAT. In this work, nanocomposites formed from the natural polymer carboxymethylcellulose in combination with the polyacrylamide polymer and zeolite were obtained and characterized in relation to pesticide sorption capability. Hydrogels are three-dimensional network with large capacity of water or biological fluid adsorption. They have biocompatibility, biodegradability and non-toxicity properties, ensuring this class of polymers is widely used in different agriculture fields. Thus, the objective of the work was to investigate the process of paraquat sorption using a novel biodegradable nanocomposite. By mathematical modeling, it was possible to found that better models were the Freundlich-Langmuir isotherm and pseudosecond order kinetic, indicating that sorption is heterogeneous and similar to chemisorption process. Thus, such nanocomposites have great potential to be applied as an adsorbent material for removal of pesticides from contaminated water.Keywords: hydrogel; nanocomposite; zeolite; pesticide sorption; Freundlich-Langmuir isotherm. INTRODUÇÃOOs hidrogéis podem ser definidos como materiais formados por dois ou mais componentes constituídos de uma rede polimérica tridimensional com capacidade de adsorver, absorver (mas sem se dissolver) e reter grande quantidade de água ou outro fluído.1 Normalmente, em seu estado intumescido, a fração de água presente no hidrogel é muito maior que a fração de massa do polímero.2,3 Além disso, os hidrogéis também apresentam biocompatibilidade e capacidade de imitar o ambiente da matriz extracelular (massa que une as células dos animais, composta de proteínas e polissacarídeos). 4,5 Em relação ao processo de síntese, os hidrogéis apresentam reticulações, que podem ser físicas ou químicas, que garantem a capacidade do polímero de não se dissolver em água. Os hidrogéis reticulados quimicamente são, normalmente, polimerizados via radical livre e iniciados por meio de tratamento tér-mico, fotoiniciação ou radiação. Ademais, também podem ser obtidos utilizando alta energia de irradiação e reação enzimática. Por outro lado, os hidrogéis reticulados fisicamente são resultados de interações não--covalentes em nível molecular, podendo ser formados por interações iônicas e ligação de hidrogênio entre as cadeias. 6,7 Dentre as diversas caracterizações a serem realizadas na área de hidrogéis, a propriedade hidrofílica é a mais importante. Sendo assim, sua capacidade de absorver água ou fluído está relacionada com os grupos hidrofílicos presentes em sua estrutura. No início do processo de intumescimento ocorre a interação entre a água e os grupamentos carregados existentes no hidrogel. Simultaneamente ocorre uma pequena interação entre a parte hidrofóbica da matriz polimérica e a água (interações fracas). As moléculas de água preenchem todos os espaços vazios disponíveis na rede tridimensional. Portanto, a porosidade, o grau de reticulação e densidade de cadeias são alguns dos fatores que afetam a capacidade de absorção do material.8 Além desses fatores, as interações que influen...

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“…The hydroxyl groups in PVA enable gel formation in combination with proper organic solvents or crosslinking agents [5][6][7] . This gel formability of PVA makes it a potential candidate for various applications such as high-performance industrial materials, medical substitutes, and adhesives [8][9][10] . Thus, many studies have been performed on the characterization of PVA gels caused by the interaction between PVA and solvent [11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

Chae¹,

Kim²,

Kim³

2016

Textile Coloration and Finishing

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In this study, efforts were made to enhance the mechanical properties of the poly(vinyl alcohol) (PVA) fibers of medium molecular weight(number-average degree of polymerization=1735) varying the ratio in DMSO/H2O mixed solvent and spinning/drawing conditions. The gel fibers prepared from pure DMSO were opaquely frozen in the coagulating bath of -20℃. However, transparent gel fibers were formed without freezing for the mixture to contain water less than 80wt%. As the amount of water in the mixture increased the residual solvent in the coagulated gel fibers decreased ranging from 85 to 42wt%. The complex viscosity increased with increasing PVA concentration in 80/20 DMSO/H2O exhibiting remarkable shear thinning at 18wt%. In the Cole-Cole plot, the 18wt% PVA solutions gave a deviated curve from 12 and 15wt% ones. Thus the optimum PVA concentration for the spinning processing of medium MW PVA solutions in 80/20 DMSO/H2O was determined to 18wt% with rheological concept. Low degree of drawing during hot drawing process in the dry state was available for high bath draft in the coagulation bath. The most improved mechanical properties were observed by applying the highest possible draw ratio attained by reducing bath draft over multi-step drawing process. In the given bath draft, linear relationship was observed between both tensile strength and modulus and draw ratio showing the inflection points at the draw ratio of 19.5 and 18.0 for tensile strength and modulus, respectively.

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Crosslinked poly(vinyl alcohol) hydrogels for wound dressing applications: A review of remarkably blended polymers

Cited by 555 publications

References 70 publications

Synthesis, characterization, and antimicrobial properties of novel double layer nanocomposite electrospun fibers for wound dressing applications

Synthesis, characterization, and antimicrobial properties of novel double layer nanocomposite electrospun fibers for wound dressing applications

Polysaccharide-Based Nanocomposite Hydrogels With Zeolite: Evaluation of the Sorption Process of Pesticide Paraquat

Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

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