Dynamic light scattering of poly(vinyl alcohol)-borax aqueous solution near overlap concentration

Chen, Chung Yuan; Yu, T. Leon

doi:10.1016/s0032-3861(96)00765-3

Cited by 41 publications

(18 citation statements)

References 27 publications

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“…After reaction the polymer chain behaves as a polyelectrolyte with electrostatic repulsions, resulting in an expansion of the network [10]. In semidilute solutions both intra and intermolecular cross-links may form, causing gelation of the PVA-borate complex [11].…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

et al. 2015

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Abstract:Poly(vinylacohol) (PVA) is a versatile polymer capable of forming hydrogels useful in a wide range of applications. Hydrogels based on cross-linking of PVA with borax, and able to incorporate organic solvents, have been used in the field of cultural heritage as tool for cleaning the surfaces. Poly(ethylenoxide) (PEO) has been introduced in the formulations of PVA-borax, with the aim of increasing the gel compatibility with organic solvents and of improving the mechanical properties of the materials. The formulations were investigated with rheological characterization, solvent loss measurements and study of the free water through the determination of the Free Water Index. The PEO molecules do not participate in the formation of the network but have been found to be responsible for a decrement of the storage moduli, explained by a spacing between crosslinks and the partial disentanglement of the PVA chains. At the same time PEO produces in the gel an increase of the apparent relaxation time, thus stabilizing the dispersions and enhancing their ability to maintain the shape. Cleaning tests for removal of an acrylic coating on limestone have been also successfully performed.

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Section: Introductionmentioning

confidence: 99%

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

et al. 2015

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“…This was based on the well known complexation of monoborate ion, B(OH) 4 – , with polyhydroxylic compounds, leading to the formation of reversible dipolar crosslinks that involve tetrahedral boron. Although the borate‐hydrogels of PVA have been studied extensively, an application based on their self‐healing ability is yet to be reported.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen‐bonded supramolecular polymers as self‐healing hydrogels: Effect of a bulky adamantyl substituent in the ureido‐pyrimidinone monomer

Chirilă

Lee

Oddon

et al. 2013

J of Applied Polymer Sci

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In an attempt to generate supramolecular assemblies able to function as self-healing hydrogels, a novel ureidopyrimidinone (UPy) monomer, 2-(N 0 -methacryloyloxyethylureido)-6-(1-adamantyl)-4[1H]-pyrimidinone, was synthesized and then copolymerized with N,N-dimethylacrylamide at four different feed compositions, using a solution of lithium chloride in N,N-dimethylacetamide as the polymerization medium. The assembling process in the resulting copolymers is based on crosslinking through the reversible quadruple hydrogen bonding between side-chain UPy modules. The adamantyl substituent was introduced in order to create a "hydrophobic pocket" that may protect the hydrogen bonds against the disruptive effect of water molecules. Upon hydration to equilibrium, all copolymers generated typical hydrogels when their concentration in the hydrated system was at least 15%. The small-deformation rheometry showed that all hydrated copolymers were hydrogels that maintained a solid-like behavior, and that their extrusion through a syringe needle did not affect significantly this behavior, suggesting a self-healing capacity in these materials. An application as injectable substitutes for the eye's vitreous humor was proposed. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39932.

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“…25 Numerous reports have demonstrated that borax and boric acid are effective cross-linking agents that can be used to form a threedimensional hydrogel network with PVA. [26][27][28][29][30] The elasticity and rheological properties of the resulting systems can be adjusted by modifying the volume ratio of PVA to borax/boric acid (or their total concentrations). 31 The dynamic borate-diester bond formed after cross-linking can also give hydrogels self-healing and viscoelastic properties.…”

Section: Introductionmentioning

confidence: 99%

A simple, safe and easily accessible polyvinyl alcohol hydrogel for wound cleaning

et al. 2022

J Biomater Appl

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Acute wounds are often contaminated by some kind of filth, and fluids are usually used to wash away the dirt, but the force of the fluid may cause secondary injury at the wound site or even increase the risk of infection. Hydrogels have several advantages over liquid scouring since they are less intense, more portable, and easier to control. In this study, poly(vinyl alcohol) was used to prepared a series of hydrogels, which were tested in terms of their properties and abilities to clean simulated dirty wounds. Simulated dirt and bacterial ( Serratia marcescens) adhesion experiments demonstrated that they could effectively adhere to a certain amount of dirt or bacteria to achieve the purpose of wound cleaning. In addition to the bacterial adhesion, the antibacterial experiments also proved that the hydrogels have a certain inhibitory effect on the proliferation of E.coli and S.aureus. The hydrogels could change shape freely and exhibited excellent biocompatibility, ductility, and self-healing capabilities, which increase their service life and make them more suitable for treating wounds or acting as protection buffers. Based on all these characteristics, the developed hydrogel may be a potentially valuable material for wound cleaning.

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Dynamic light scattering of poly(vinyl alcohol)-borax aqueous solution near overlap concentration

Cited by 41 publications

References 27 publications

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

Hydrogen‐bonded supramolecular polymers as self‐healing hydrogels: Effect of a bulky adamantyl substituent in the ureido‐pyrimidinone monomer

A simple, safe and easily accessible polyvinyl alcohol hydrogel for wound cleaning

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