Topic
Methacrylic acid
About: Methacrylic acid is a research topic. Over the lifetime, 13058 publications have been published within this topic receiving 173201 citations. The topic is also known as: α-Methacrylic acid & 2-Methylacrylic acid.
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TL;DR: In this paper, the effect of neutralizing cation on the melt rheology and exfoliation efficiency of the ionomers was examined using transmission electron microscopy, wide-angle X-ray scattering, DSM axial-force rheometry, and stress−strain analysis.
Abstract: Morphology and mechanical properties of nanocomposites prepared by melt mixing a montmorillonite-based organoclay with lithium, sodium, and zinc ionomers of poly(ethylene-co-methacrylic acid) are presented here. The effect of the type of neutralizing cation on the melt rheology and organoclay exfoliation efficiency of the ionomers was examined using transmission electron microscopy, wide-angle X-ray scattering, DSM axial-force rheometry, and stress−strain analysis. Nanocomposites prepared from the sodium and the zinc ionomers displayed much better exfoliation of the organoclay and superior levels of reinforcement compared to equivalent nanocomposites prepared from the lithium ionomer. On the basis of the detailed experimental analysis, the lower levels of organoclay exfoliation observed in the nanocomposites prepared from the lithium ionomer are suggested to be a result of irreversible exchange of quaternary ammonium ions (of the organoclay) for the very small lithium ions (of the polymer) that can enter ...
45 citations
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TL;DR: Adsorption isotherms and zeta-potential measurements showed that albumin adsorption was controlled by hydrogen bonding/van der Waals interactions and that brush-like structures may enhance the Adsorption of albumin on these particles.
Abstract: Particulate systems composed of polyelectrolyte complexes (PEC) based on chitosan and poly(methacrylic acid) were obtained via template polymerization. The resultant particles were characterized as having regions with different charge densities: chitosan predominating in the core and poly(methacrylic acid) at the surface, the particles being negatively charged, as a consequence. Albumin was adsorbed on these particles (after cross-linking with glutardialdehyde), and pH was controlled to obtain two conditions: (i) adsorption of positively charged albumin and (ii) adsorption of albumin at its isoelectric point. Adsorption isotherms and ζ-potential measurements showed that albumin adsorption was controlled by hydrogen bonding/van der Waals interactions and that brush-like structures may enhance the adsorption of albumin on these particles. It was also found that shearing can induce desorption of albumin from the PEC surface, depending on the continuous phase albumin concentration.
45 citations
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TL;DR: In this article, a series of pH, temperature, and electrical stimulus sensitive novel hydrogels of Gum ghatti (Gg) with vinyl monomer mixtures of acrylamide (AAm) with acrylic acid (AA), acrylonitrile (AN), and methacrylic acid (MAA) using potassium persulphate-ascorbic acid redox pair as an initiator and N,N’-methylene-bis-acrylamides (MBA) as a crosslinker was synthesized using a free radical polymer
Abstract: A series of pH, temperature, and electrical stimulus sensitive novel hydrogels of Gum ghatti (Gg) with vinyl monomer mixtures of acrylamide (AAm) with acrylic acid (AA), acrylonitrile (AN), and methacrylic acid (MAA) using potassium persulphate-ascorbic acid redox pair as an initiator and N,N’-methylene-bis-acrylamide (MBA) as a crosslinker was synthesized using a free radical polymerization process. Initially, different reaction parameters for the graft copolymerization and crosslinking of Gum ghatti with AAm and MBA were optimized. Afterwards, optimization of AA, AN, and MAA in combination with preoptimized AAm was carried out. Synthesized products were characterized by FT-IR, SEM, XRD, and TGA/DTA/DTG. Swelling behavior of hydrogels was investigated in deionized water as a function of time, temperature, and pH of swelling medium. Moreover, hydrogels have been found to exhibit cationic charge-dependent swelling in different salt solutions of Na+, Ba2+, Fe3+, and Sn4+. The order of swelling was found to ...
45 citations
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TL;DR: In this paper, a monodisperse, reactive hydrogel microspheres were prepared by precipitation polymerization of p-nitrophenyl acrylate (NPA) with acrylamide, methacrylic acid, and methylenebisacrylamides in ethanol.
Abstract: Monodisperse, reactive hydrogel microspheres were prepared by precipitation polymerization ofp-nitrophenyl acrylate (NPA) with acrylamide, methacrylic acid, and methylenebisacrylamide in ethanol. The size of microspheres was controlled by the monomer ratio. Some fraction of reactive ester decomposed during the polymerization. The reactive hydrogel microspheres were converted to amphoteric ones by the reaction of NPA units with diamine. The isoelectric point of the amphoteric microspheres was around 4.0, but it was different from the pH at which the microspheres have the minimum size or the most shrunken state. This was attributed to the uneven distribution of induced amine groups.
45 citations
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TL;DR: In this paper, the inhibition performance of poly (methacrylic acid) (PMAA) and the effect of addition of iodide ions on the inhibition efficiency for mild steel corrosion in 0.5 m H2SO4 solution were investigated in the temperature range of 303 −333 K using electrochemical, weight loss, scanning electron microscopy (SEM), and water contact angles measurements.
Abstract: The inhibition performance of poly (methacrylic acid) (PMAA) and the effect of addition of iodide ions on the inhibition efficiency for mild steel corrosion in 0.5 M H2SO4 solution were investigated in the temperature range of 303–333 K using electrochemical, weight loss, scanning electron microscopy (SEM), and water contact angles measurements. The results show that PMAA is a moderate inhibitor for mild steel in 0.5 M H2SO4 solution. Addition of small amount of KI to PMAA significantly upgraded the inhibition efficiency up to 96.7%. The adsorption properties of PMAA and PMAA + KI are estimated by considering thermodynamic and kinetic parameters. The results reveal that PMAA alone was physically adsorbed onto the mild steel surface, while comprehensive adsorption mode characterized the adsorption of PMAA + KI. Adsorption of PMAA and PMAA + KI followed Temkin adsorption isotherm. The SEM and water contact angle images confirmed the enhanced PMAA film formation on mild steel surface by iodide ions.
45 citations