Advanced searches left 3/3

Acrylic Acid - Europe PMC

Summarized by Plex Scholar
Last Updated: 10 November 2022

* If you want to update the article please login/register

Modelling viscoelastic relaxation mechanisms in thermorheologically complex Fe(III)-poly(acrylic acid) hydrogels.

Hydrogels with reversible transition metal-polymer crosslink crosslinks can be modified in a variety of ways, depending on the metal bond's dissociation kinetics. We use rheology to investigate the sol-gel transition of a Fe-poly network with varying crosslinker content and model the subsequent mechanical relaxation at different stages of gelation. Whether or not the chain participates in the network, the activation energy of chain relaxation remains unchanged. We incorporate results from fractional viscoelasticity analysis with a generalized Maxwell model, which explains the behaviour of unentangled chain solution with reversible crosslinks. We can determine the evolution of viscoelastic parameters in the course of gelation, here we find that the terminal relaxation time of the gels increases less than expected at high crosslinker rates.

Source link: https://europepmc.org/article/MED/36317679


Poly(acrylic acid)-Based Composite Gel Polymer Electrolytes with High Mechanical Strength and Ionic Conductivity toward Flexible Zinc-Air Batteries with Long Cycling Lifetime.

The increasing availability of portable, customizable, and wearable batteries has fueled the desire for flexible zinc-air batteries not only to ensure high energy density but also sufficient deformability for wearer comfort. Herein, we present an optimized poly -based composite GPE with the aluminum oxide filler and use it for FZAB. The PAA-Al 2 O 3 gel polymers and their related GPEs were investigated for their mechanical stability, electrolyte absorption capacity, electrolyte retention capability, electrolyte retention performance, and ionic conductivity. The above results show that polymers' and corresponding GPEs' performance are greatly dependent on the content of the addition of Al 2 O 3 particles. The obtained PAA-20 wt. % Al 2 O 3 gel polymer has increased mechanical stability when 20 wt. % Al 2 O 3 is added to the PAA polymer.

Source link: https://europepmc.org/article/MED/36300883


Stable catalysis of neutral silica-supported potassium lactate for vapour-phase dehydration of lactic acid to acrylic acid - critical role of the support.

The acidic KNO 3 /silica systems are not suitable for catalytic selectivity and stability for the manufacture of AA, according to a combination of catalytic and acid property studies, whereas the neutral KNO 3 /silica systems favor catalytic selectivity and stability for the production of AA. According to a combination of catalytic and TGA studies, the interaction between KNO 3 and silica has a major influence on catalytic stability for AA production. The effects of the surface acidity and the silica interactions on the catalytic performance are attributed to the potassium salt or base salt's content and stability as the catalytic active species, according to a combination of IR and catalytic experiments.

Source link: https://europepmc.org/article/MED/36193811


Drug release and thermal properties of magnetic cobalt ferrite (CoFe 2 O 4 ) nanocomposite hydrogels based on poly(acrylic acid-g-N-isopropyl acrylamide) grafted onto gum ghatti.

The purpose of this investigation was to determine the primary drug release characteristics of a Gg-poly/CoFe2O4 hydrogel containing metformin hydrochloride as the model drug. For the controlled release of metformin hydrogen chloride, Nanocomposite's hydrogel of gum ghatti free radical polymerization is used. Using FTIR, SEM, TGA, and DSC, synthesized nanocomposites hydrogel was characterized. To investigate the PBS release profiles, we used metformin hydrochloride, which is an antidiabetic drug. Dependent on drug properties, the effects of polymer level and initial drug loading on release depended on drug properties. Different experimental designs were tested for release kinetic studies, which revealed that the zero-order model provided the highest kinetics release studies in PBS and demonstrated sustained release. The kinetics of drug delivery were found to match the Korsmeyer-Peppas model with a n > 1, indicating a specific case II transport mechanism.

Source link: https://europepmc.org/article/MED/36283560


In Vitro Assessment of Poly-N-Vinylpyrrolidone/Acrylic Acid Nanoparticles Biocompatibility in a Microvascular Endothelium Model.

Both the CFSE dye and the DiI dye were localized to the treated cells' cytoplasm on uptake. These cells' viability at higher doses of 0. 033 and 0. 066 mg/mL were not affected by normal and treated with p did not interfere with the viability of normal and tested with LPS, HMEC-1 cells at 0. 010 mg/mL, resulting in a dose-dependent decrease in these cells' viability at higher concentrations of 0. 033 and 0. 066 mg/mL. Moreover, we investigated the expression of adhesion molecules in HMEC-1 endothelial cells after p NPs treatment.

Source link: https://europepmc.org/article/MED/36293301


Introduction of poly(acrylic acid) sodium into traditional draw solution to enhance its driving capacity in forward osmosis process.

Poly sodium salt was chosen as a standard polymer additive in this research, and the effect on traditional draw solute NaCl's forward osmosis results was investigated. Both FO and PRO mode at 25 00b0C u00b0C, while the PAA-Na increased water flux in both FO and PRO mode at 25 u00b0C. PAA-Na influenced FO performance by increasing membrane hydrophilicity, which can increase water permeation and was prevalent at low temperatures, and caused pore-clogging, leading water flux decrease at high temperatures, which was significant at high temperatures. Despite that MgCl 2 reduced RSF and kept water flux constant, its role was not clear.

Source link: https://europepmc.org/article/MED/36227491

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions