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, Caprolactam-induced Rhodococcus rhodochrous J1 cells containing abundant nitrilase were used in the production of acrylic acid and methacrylic acid from acrylonitrile.
Abstract: e-Caprolactam-induced Rhodococcus rhodochrous J1 cells containing abundant nitrilase were used in the production of acrylic acid and methacrylic acid from acrylonitrile and methacrylonitrile, respectively. Under a periodic substrate feeding system, the highest accumulations, 390 g acrylic acid/l and 260 g methacrylic acid/l, were attained.
56 citations
TL;DR: In this paper, a physical model describing the microstructure of a model HASE polymer in aqueous salt solution is proposed, which contains a copolymer backbone of equal moles of methacrylic acid (MAA) and ethyl acrylate (EA).
Abstract: The microstructure of a model HASE associative polymer in aqueous salt solution is complex and has not been defined until now. On the basis of the results from static and dynamic light scattering studies, a physical model describing the microstructure of a model HASE polymer in aqueous salt solution is proposed. The model HASE polymer contains a copolymer backbone of equal moles of methacrylic acid (MAA) and ethyl acrylate (EA) with 1 mol % of C16H33 hydrophobic modified macromonomer distributed randomly along the backbone. In very dilute aqueous solutions (0.005−0.1 wt %), two decay modes are observed in the relaxation time distribution function. The fast and the slow modes correspond to the translational diffusion of the unimers and the polymer aggregates (consisting of about five polymer chains), respectively. The polymer aggregate is formed by association of the hydrophobic macromonomer via a closed association mechanism. When the polymer concentration increases, the polymer aggregates grow in size. T...
56 citations
TL;DR: Self-cross-linkable polyelectrolyte pairs comprised of poly(methacrylic acid, sodium salt-co-2-[ methacryloyloxy]ethyl acetoacetate) and poly-L-lysine are incorporated into CaAlg beads to form either a covalently cross-linked shell or a core-crossed bead, which are resistant to chemical and mechanical stress yet remain cyto-compatible.
56 citations
Patent•
16 Jan 2001TL;DR: In this paper, the authors describe a composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, characterised in that the polymeric shells comprises a copolymer formed from a monomer blend which comprises, A) 30 to 90 % by weight methacrylic acid B) 10 to 70 % by Weight alkyl ester of (meth) acyclic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60 °C and C) 0 to 40
Abstract: A composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, characterised in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises, A) 30 to 90 % by weight methacrylic acid B) 10 to 70 % by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60 °C and C) 0 to 40 % by weight other ethylenically unsaturated monomer. The core material can comprise an active ingredient selected from the group consisting of UV absorbers, UV reflectors, pigments, dyes, colorants, scale inhibitors, corrosion inhibitors, antioxidants, pour point depressants, wax deposition inhibitors, dispersants, flame retardants, biocides, active dye tracer materials and phase change materials. The composition has the advantage that the polymeric shell is highly impermeable to the core material even at elevated temperatures.
55 citations
TL;DR: In this paper, the effect of methacrylic acid (MAA) on the mechanical properties of polymer concrete using methyl methacrylate (MMA) and polymethyl methacylate (PMMA) as a binder was examined.
55 citations