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.

Analysis of polymer surfaces by SIMS. 2—fingerprint spectra from simple polymer films

Abstract: Seven polymers (low density polyethylene, polypropylene, polystyrene, polymethylmethacrylate, poly(methacrylic acid), Nylon-6 and poly(ethyleneterephthalate)) have been studied by SIMS. Very good signal: noise spectra up to mass 250 have been obtained using low damage conditions (i.e. ion current densities ∽1 nA cm−2) and electron beam charge neutralization. The spectra are highly characteristic and fairly easily interpreted using fragmentation data from electron impact mass spectrometry.

Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper

Abstract: Water-soluble copolymers containing copolymerized vinylamine units are prepared by copolymerizing (a) from 95 to 10 mol % of N-vinylformamide and (b) from 5 to 90 mol % of an ethylenically unsaturated monomer from the group consisting of vinyl acetate, vinyl propionate, C 1 -C 4 -alkyl vinyl ethers, the esters, nitriles and amides of acrylic acid and methacrylic acid and N-vinylpyrrolidone, and then eliminating from 30 to 100 mol % of the formyl groups from the copolymer. Preferred copolymers are copolymers of N-vinylformamide and vinyl acetate, in which from 30 to 100 mol % of the monomer units are hydrolyzed. The copolymers are used in papermaking to increase the dry strength and wet strength of the paper.

Characterization of Micelles of Polyisobutylene-block-poly(methacrylic acid) in Aqueous Medium

Abstract: Four amphiphilic block copolymers polyisobutylene-block-poly(methacrylic acid) (IBm-MAAn; m = 70−134, n = 52−228) were synthesized and transferred into aqueous medium at pH 10−12. Their structure in solution was characterized by fluorescence correlation spectroscopy (FCS), static and dynamic light scattering (SLS, DLS), analytical ultracentrifuge (AUC), and by transmission electron microscopy (TEM) with freeze-fracturing and staining techniques. DLS data, AUC sedimentation traces, and TEM images indicate at least two different kinds of particles. TEM shows spherical micelles; however, especially for polymers with larger hydrophobic blocks, additional particles are observed. FCS shows extremely low critical micelle concentrations (cmc < 0.3 mg/L). The main part of the particles consists of micelles with diameters from 15 to 50 nm, built by 130−200 block copolymer molecules. Aggregation numbers and diameters are consistent with a model recently proposed by Forster et al. (J. Chem. Phys. 1996, 104, 9956−9970...

One-Pot Synthesis of Hydrophilic Molecularly Imprinted Nanoparticles

Abstract: Molecularly imprinted nanoparticles were prepared using a simple distillation precipitation polymerization method. In this work, propranolol-imprinted nanoparticles were synthesized using different cross-linkers combined with methacrylic acid (MAA) as a functional monomer in refluxing acetonitrile. Using the new synthetic method, uniform prorpanolol-imprinted nanoparticles were obtained in less than 3 h, which is in contrast to the long reaction time (24 h) required in previous precipitation polymerization. The new synthetic method also provides a convenient means to prepare core−shell structured nanoparticles, where the core contains imprinted binding sites and the shell has more hydrophilic characteristics. Molecular recognition properties of the imprinted nanoparticles were studied through equilibrium binding experiments. For nanoparticles containing N,N′-methylenebis(acrylamide) cross-linker, the residual C═C bonds remaining in the nanoparticles were utilized to immobilize a fluorescent compound, 1-py...