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 article, the pH-responsive behavior of random polyampholyte brushes synthesized by surface-initiated Atom Transfer Radical Polymerization is studied. And the structure of the polypholyte brush in aqueous solutions at different pH is determined using neutron reflectivity.
Abstract: We study the pH-responsive behavior of random polyampholyte brushes synthesized by surface-initiated Atom Transfer Radical Polymerization. We define the “annealed” polyampholyte as the random copolymer that contains weak acid (methacrylic acid) and weak base (2-(dimethylamino)ethyl methacrylate) units. The “semi-annealed” polyampholyte is defined as the random copolymer that contains the methacrylic acid and a strong base unit (the quaternized amine). The structure of the polyampholyte brushes in aqueous solutions at different pH is determined using neutron reflectivity. The monomer density profile and therefore the brush thickness are obtained. Polymer brushes with various grafting densities are compared. We demonstrate that the structure of the polyampholyte brush depends strongly on the net charge of the chains. With an excess of charge, the brush is as stretched as a polyelectrolyte brush, and the swelling behavior is in good agreement with the scaling laws. At the isoelectric point corresponding to a...
57 citations
TL;DR: The termination kinetics of free-radical polymerization of nonionized methacrylic acid (MAA) in aqueous solution has been investigated at two MAA concentrations, 30 and 60 wt %, by single-pulse pul...
Abstract: The termination kinetics of free-radical polymerization of nonionized methacrylic acid (MAA) in aqueous solution has been investigated at two MAA concentrations, 30 and 60 wt %, by single-pulse pul...
56 citations
TL;DR: The effect of the molar mass of polyoxyethylene, POE, upon the mechanism of complexation with polymethacrylic acid, PMAA, has been examined, using pH, density, calorimetric and cloud point studies as discussed by the authors.
56 citations
TL;DR: In this paper, the vapor phase aldol condensation of propionic acid with formaldehyde (HCHO) to form methacrylic acid (MAA) was performed with a PA/HCHO molar ratio of 2 using various silica-supported metal phosphate catalysts.
Abstract: The vapor-phase aldol condensation of propionic acid (PA) with formaldehyde (HCHO) to form methacrylic acid (MAA) was performed with a PA/HCHO molar ratio of 2 using various silica-supported metal phosphate catalysts. In the absence of water, a silica-supported tin phosphate with Sn/Si/P atomic ratio of 1/8/2.3 showed the same level of performance as a silica-supported vanadium phosphate with V/Si/P atomic ratio of 1/8/2.2 did. The one-pass yield of MAA reached 58% based on the HCHO feed. In the presence of water, the performances of almost all catalysts fell. However, the Sn/Si/P catalyst showed a relatively high performance even in the presence of water. The performance is almost identical to that obtained from a silica-supported cesium oxide catalyst.
56 citations
TL;DR: In this article, the authors used a nanocomposite with immobilized colloidal TiO 2 nanoparticles to investigate photocatalytic degradation of three different groups of anionic azo dyes in aqueous solutions under solar light simulating source.
56 citations