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.

Synthesis of sensitive hybrid polymer microgels for catalytic reduction of organic pollutants

Abstract: Multiresponsive tercopolymer microgel poly( N -isopropyl acrylamide- co -methacrylic acid- co -2-hydroxyethyl methacrylate) was synthesized by free radical emulsion polymerization. The silver and gold nanoparticles were homogeneously dispersed in polymer network by in-situ chemical reduction method at 10 and 40 °C using sodium borohydride as reducing agent. FT-IR spectroscopy confirms the microgel synthesis and existing of metal nanoparticles inside the polymer network. Temperature and pH sensitivity on particle size of the microgel particles was investigated by dynamic light scattering. Transmission electron microscopy analysis showed that the size of Ag and Au nanoparticles is 13 and 7 nm, respectively. The catalytic activity of hybrid microgels was studied for the reduction of aqueous solutions of 4-nitrophenol, congo red and methylene blue as model reactions.

Importance of Functional Monomer Dimerization in the Molecular Imprinting Process

Abstract: We examined the influence of functional monomer dimerization on the efficiency of the molecular imprinting process. Specifically, the influence of methacrylic acid (MAA) dimerization on the binding properties of molecularly imprinted polymers (MIPs) was studied. First, the dimerization of MAA and the association between MAA and template molecular ethyl adenine-9-acetate (EA9A) were characterized in solution. Next, a series of MIPs and control nonimprinted polymers (NIPs) were made under varying conditions that systematically disrupted the monomer dimerization and templation process by the addition of polar solvents to the polymerization mixture. The results showed that even a monomer such as MAA with low dimerization constant is able to efficiently suppress the formation of background binding sites. To isolate the influence of monomer dimerization on the imprinting effect, the equilibrium processes in the prepolymerization mixture were modeled using the computer program COPASI. The simulation was able to ...

An Efficient and Highly Versatile Synthetic Route to Prepare Iron Oxide Nanoparticles/Nanocomposites with Tunable Morphologies

Abstract: We report a versatile synthetic method for the in situ self-assembly of magnetic-nanoparticle-functionalized polymeric nanomorphologies, including spherical micelles and rod-like and worm-like micelles and vesicles. Poly(oligoethylene glycol methacrylate)-block-(methacrylic acid)-block-poly(styrene) (POEGMA-b-PMAA-b-PST) triblock copolymer chains were simultaneously propagated and self-assembled via a polymerization-induced self-assembly (PISA) approach. Subsequently, the carboxylic acid groups in the copolymers were used to complex an iron ion (FeII/FeIII) mixture. Iron oxide nanoparticles were then formed in the central block, within the polymeric nanoparticles, via alkaline coprecipitation of the iron(II) and (III) salts. Nanoparticle morphologies, particle sizes, molecular weights, and chemical structures were then characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), size exclusion chromatography (SEC), and 1H NMR measurements. TEM micrographs showed that the averag...

Amphiphilic star-block copolymers based on a hyperbranched core : Synthesis and supramolecular self-assembly

Abstract: Novel amphiphilic star-block copolymers, star poly(caprolactone)-block-poly[(2-dimethylamino)ethyl methacrylate] and poly(caprolactone)-block-poly(methacrylic acid), with hyperbranched poly(2-hydroxyethyl methacrylate) (PHEMA–OH) as a core moiety were synthesized and characterized. The star-block copolymers were prepared by a combination of ring-opening polymerization and atom transfer radical polymerization (ATRP). First, hyperbranched PHEMA–OH with 18 hydroxyl end groups on average was used as an initiator for the ring-opening polymerization of e-caprolactone to produce PHEMA–PCL star homopolymers [PHEMA = poly(2-hydroxyethyl methacrylate); PCL = poly(caprolactone)]. Next, the hydroxyl end groups of PHEMA–PCL were converted to 2-bromoesters, and this gave rise to macroinitiator PHEMA–PCL–Br for ATRP. Then, 2-dimethylaminoethyl methacrylate or tert-butyl methacrylate was polymerized from the macroinitiators, and this afforded the star-block copolymers PHEMA–PCL–PDMA [PDMA = poly(2-dimethylaminoethyl methacrylate)] and PHEMA–PCL–PtBMA [PtBMA = poly(tert-butyl methacrylate)]. Characterization by gel permeation chromatography and nuclear magnetic resonance confirmed the expected molecular structure. The hydrolysis of tert-butyl ester groups of the poly(tert-butyl methacrylate) blocks gave the star-block copolymer PHEMA–PCL–PMAA [PMAA = poly(methacrylic acid)]. These amphiphilic star-block copolymers could self-assemble into spherical micelles, as characterized by dynamic light scattering and transmission electron microscopy. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 6534–6544, 2005