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, anon exchange membranes were prepared by grafting acrylic acid (AA) and methacrylic acid to the substrates such as microporous polyethylene (PE), polytetrafluoroethylenes (PTFE), and homogeneous poly[1-(trimethylsilyl)-1-propyne] (PTMSP) by the use of the plasma graft polymerization technique.
66 citations
TL;DR: A series of amphiphilic end-linked conetworks was synthesized by the combination of quasiliving carbocationic (QLCCP) and group transfer polymerizations (GTP) as mentioned in this paper.
Abstract: A series of amphiphilic end-linked conetworks was synthesized by the combination of two "quasiliving" polymerization techniques, quasiliving carbocationic (QLCCP) and group transfer polymerizations (GTP). The hydrophobic monomer was polyisobutylene methacrylate synthesized by the QLCCP of isobutylene and subsequent terminal modification reactions. The hydrophilic monomer was methacrylic acid (MAA) introduced via the polymerization of 2-tetrahydropyranyl methacrylate followed by acid hydrolysis after (co)network formation. The conetwork syntheses were performed by sequential monomer/crosslinker additions under GTP conditions. All the precursors and the extractables from the conetworks were characterized by gel permeation chromatography and H-1 NMR. The resulting polymer conetworks were investigated in terms of their degree of swelling (DS) in aqueous media and in tetrahydrofuran (THF) over the whole range of ionization of the MAA units and in n-hexane for uncharged conetworks. The DSs in water increased with the degree of ionization (DI) of the MAA units and the hydrophilic content in the conetwork, whereas the DSs in THF increased with the reduction of the DI of the MAA units. The effective pK of the MAA units in the conetworks increased from 8.4 to 10.5 with decreasing MAA content. These findings can facilitate the design of similar unique conetworks with adjustable swelling behavior and composition-de pendent pK values. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4289-4301, 2009
65 citations
TL;DR: In this paper, the chiral recognition mechanism with molecularly imprinted polymers (MIPs) in aqueous environment was elucidated by a self-assembly mechanism, which includes the pre-organizing functional monomers around template before polymerization process.
65 citations
TL;DR: In this paper, the behavior of poly(methacrylic acid) chains is investigated in aqueous micellar systems. But the authors focus on the shell of a polysoap-like polyelectrolyte.
Abstract: Block polyelectrolyte samples containing long hydrophobic blocks, e.g., polystyrene, and long polyelectrolyte blocks, e.g., poly(methacrylic acid), do not dissolve in aqueous media. However, multimolecular micelles consisting of compact polystyrene cores and polyelectrolyte shells may be prepared by dialysis from organic solvent−water mixtures into aqueous buffers. Polystyrene cores are kinetically frozen in water and the behavior of the micellar systems is determined by the polyelectrolyte behavior of the shell. Poly(methacrylic acid) does not represent a typical polyelectrolyte. Due to the presence of a strongly hydrophobic methyl group in each repeating unit, its behavior more resembles that of a polysoap. In aqueous micellar systems, poly(methacrylic acid) chains form a fairly compact hydrophobic layer close to the core/shell interface. In our recent works, we have found that the state of the inner part of the shell responds rather slowly to shock changes in the bulk pH and the ionic strength of the s...
65 citations
TL;DR: The critical micellization concentration, estimated by means of fluorescence spectroscopy with the use of pyrene as a polarity probe, is decisively determined by the length of the PIB block and is insensitive to changes in the lengthof the PMAA block.
Abstract: Ionic amphiphilic diblock copolymer polyisobutylene-block-poly(methacrylic acid) (PIBx-b-PMAAy), with various lengths of nonpolar (x = 25−75) and polyelectrolyte (y = 170−2600) blocks, spontaneously dissolve in aqueous media at pH >4, generating macromolecular assemblies, the aggregation number of which depends on external stimuli (pH and ionic strength). Spherical micellar morphology with a compact core formed by the PIB blocks and a swollen corona built up from the PMAA blocks was deduced by cryogenic transmission electron microscopy. The micelles were further characterized by means of dynamic and static light scattering as well as small-angle neutron scattering. The critical micellization concentration, estimated by means of fluorescence spectroscopy with the use of pyrene as a polarity probe, is decisively determined by the length of the PIB block and is insensitive to changes in the length of the PMAA block.
65 citations