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.

Investigations into the Mechanisms of Molecular Recognition with Imprinted Polymers

Abstract: The nature of molecular recognition in an imprinted polymer that is formed by the self-assembly of binding monomer and imprint through noncovalent interactions is investigated. The system studied uses ethylene glycol dimethacrylate, methacrylic acid, and l-phenylalanine anilide as the cross-linking monomer, binding monomer, and imprint, respectively, to assemble the imprinted polymer. A proposal for the self-assembly mechanism between the binding monomer and imprint that occurs during polymer synthesis is derived from a single-crystal X-ray structure of a crystal containing binding monomer and imprint and from 1H NMR and FTIR spectroscopy of solutions of these components. These studies show the presence of a salt-bridge interaction that leads to a 1:1 molecular complex between methacrylic acid and l-phenylalanine anilide and provide no evidence for the formation of higher-order molecular complexes of these species. Furthermore, macroscopic phase separation is observed between the imprint and binding monom...

Tuning the Formation and Degradation of Layer-by-Layer Assembled Polymer Hydrogel Microcapsules†

Abstract: Engineered polymer capsules are finding widespread importance in the delivery of encapsulated toxic or fragile drugs. The effectiveness of polymer capsules as therapeutic delivery vehicles is often dependent on the degradation behavior of the capsules because it is often necessary to release the encapsulated drugs at specific times and in certain locations. Herein we investigate the parameters that govern the formation and degradation of a recently introduced new class of polymer hydrogel capsules based on disulfide cross-linked poly(methacrylic acid). We report a new and efficient method for the synthesis of thiol-functionalized poly(methacrylic acid) (PMASH), the main component of the capsules. Polymeric capsules were synthesized by the layer-by-layer deposition of PMASH and poly(vinylpyrrolidone) (PVPON) on silica particle templates, followed by cross-linking the PMASH layers and removing PVPON and the template particles. The disulfide cross-links provided a redox-active trigger for degradation that wa...

Polymerication processes and products therefrom

Abstract: 1. In a process for preparing a cation exchange resin having a water-insoluble matrix and cation exchange groups bonded thereto, the improvement comprising employing as said matrix a solid copolymer of macroreticular structure which is permeated by small channels or voids into which liquids are able to penetrate, which matrix is prepared by copolymerizing a mixture consisting essentially of (1) a monovinyl carbocyclic aromatic compound or an ester of acrylic or methacrylic acid, with (2) a polyethylenically unsaturated monomer selected from the group consisting of a polyvinyl carbocyclic aromatic compound, an ester of a dihydric alcohol and an α-β-ethylenically unsaturated carboxylic acid, diallyl maleate, and divinyl ketone; the aforesaid copolymerization being conducted while the monomers are dissolved in 25 to 150% by weight, based on monomer weight, of an organic liquid or mixture of organic liquids which is a solvent for said monomers but is unable to substantially swell the copolymers resulting from copolymerization.

Polymers useful as pH responsive thickeners and monomers therefor

Abstract: Novel aqueous thickener or thixotropic polymers are prepared by the copolymerization of (A) about 15-60 weight percent of a C 3 -C 8 alpha, beta-ethylenically unsaturated carboxylic acid monomer, preferably acrylic or methacrylic acid or a mixture thereof with itaconic or fumaric acid, (B) about 15-80 weight percent of a nonionic copolymerizable C 2 -C 12 alpha, beta-ethylenically unsaturated monomer, preferably a monovinyl ester such as ethyl acrylate or a mixture thereof with styrene, acrylonitrile, vinyl chloride or vinyl acetate, and (C) about 1-30 weight percent of a new and novel nonionic ethylenically unsaturated nonionic biphillic monomer such as tristyrylpoly(ethyleneoxy) x methyl acrylate, to provide a stable aqueous colloidal dispersion at an acid pH lower than about 5.0 but becoming an effective thickener for aqueous systems upon adjustment to a pH of about 5.5-10.5 or higher. These polymers adjusted to a pH of about 5.5 or higher are effective thickeners for a wide variety of aqueous systems including cosmetic products, drilling muds, aqueous coating compositions such as latex paint, and high solids compositions such as spackle, grouts, cements, and the like.