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 fluorescence intensity of dansyl residues attached to poly(acrylic acid) (PAA) increases sharply when PAA forms complexes with polyoxyethylene (POE) or poly(vinyl pyrrolidone)(PVP), because the emission from this chromophore is more intense in organic media than in water.
75 citations
TL;DR: In this article, a branched poly(methacrylic acid)s (PMAAs) is reported via conventional solution free radical polymerization of MAA with divinylbenzene (DVB) as the branching comonomer.
Abstract: A novel synthesis of branched poly(methacrylic acid)s (PMAAs) is reported via conventional solution free radical polymerization of MAA with divinylbenzene (DVB) as the branching comonomer. Controlled levels of dodecanethiol (DDT) have been used successfully to inhibit network formation and gelation. Quantitative methylation of the branched polymers has been achieved using trimethylsilyldiazomethane, and subsequent 1H NMR spectroscopic analysis of both the acid polymers and their methyl esters has allowed quantification of their molecular composition. Characterization of the branched architecture was carried out using dual detection size exclusion chromatography (DDSEC) and was confirmed by 1H NMR spectroscopic analysis. A pH dependence study of the dilute solution reduced viscosity of the branched poly(methacrylic acid)s in 10 vol % MeOH/H2O has shown almost complete suppression of the polyelectrolyte effect which we attribute to the branched architecture of these macromolecules.
75 citations
TL;DR: In this article, the authors investigated catalytic oxidation of methacrolein (MAL) to methacrylic acid (MAA) over SiO2-supported H4PMo11VO40 with different loadings.
75 citations
TL;DR: In this article, modifications to the PVA/H3PO4 proton conducting polymer blend were made to improve stability and performance of the polymer electrolyte-based hydrogen sensor developed for on-line analysis.
75 citations
TL;DR: In this paper, the synthesis and characterization of copolymers containing 2-ethylhexyl methacrylate and a quadruple-hydrogen-bonding site, 2-ureido-4[1H]-pyrimidone methACrylate (UPyMA), are described.
Abstract: The synthesis and characterization of copolymers containing 2-ethylhexyl methacrylate and a quadruple-hydrogen-bonding site, 2-ureido-4[1H]-pyrimidone methacrylate (UPyMA), are described. An analogous dimeric hydrogen-bond-containing copolymer based on 2-ethylhexyl methacrylate and methacrylic acid (PEHMA-co-MAA) was also synthesized for comparative purposes. The glass-transition temperatures of the poly(2-ethylhexyl methacrylate-co-2-ureido-4[1H]-pyrimidone methacrylate) (PEHMA-co-UPyMA) series increased linearly with increasing UPyMA content. Creep compliance measurements as a function of temperature indicated a decrease in the creep compliance with increasing UPyMA content over the range of 1–10 mol % UPyMA. Melt rheological analysis also showed an increase and lengthening of the plateau modulus as a function of frequency with increasing UPyMA content, as well as increasing complex viscosity as a function of temperature. The analogous PEHMA-co-MAA copolymer, which contained 11 mol % methacrylic acid, showed, in the melt rheological analysis, behavior similar to that of the PEHMA-co-UPyMA copolymer containing only 1 mol % UPyMA units. The multiple-hydrogen-bond-containing copolymers were successfully analyzed with time–temperature superposition for the construction of master curves. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 4618–4631, 2005
75 citations