			Home About us Contact

Ionic Monomers (ionic + monomer)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Selected Abstracts

Thermal Sensitivity of tert -Butyloxycarbonylmethyl-Modified Polyquats in Condensed Phase and Solubility Properties of Copolymers with N -Isopropylacrylamide

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 15 2010
Nina Gonsior
Abstract The synthesis of the easily decomposable ionic monomer 2- tert -butoxy- N -[2-(methacryloyl-oxy)ethyl]- N,N -dimethyl-2-oxoethanammonium chloride (3) via thermally induced syn-elimination of a tert -butyl ester group was realized simply by mixing N,N -dimethylaminoethyl methacrylate (1) and tert -butyl chloroacetate (2) at ambient temperature without solvent. The obtained salt was polymerized via free radical polymerization. The decomposition and foaming via iso -butene formation takes place by heating up to about 160,°C. IR, DSC, TGA, and GC/MS measurements were performed to follow this pyrolysis reaction. Furthermore, the copolymerization of 3 with N -isopropylacrylamid (NiPAAm, 5) was carried out with different monomer ratios. Molar mass distributions were measured using an asymmetrical flow field-flow fractionation (aFFFF) system. The obtained copolymers 6,10 exhibit lower critical solution temperature (LCST) behaviour in water with cloud points at different temperatures depending on the monomer ratio. [source]

Magnetic field effects on the copolymerization of water-soluble and ionic monomers

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 2 2009
Ignacio Rintoul
Abstract The effect of magnetic field (MF) on the radical copolymerization of a series of water-soluble and ionic monomers is presented including acrylamide (AM), acrylic acid (AA), its ionized form acrylate (A,), and diallyldimethylammonium chloride (DADMAC). The following combinations have been studied: AM/AA, AM/A,, AM/DADMAC, and AA/DADMAC. In addition to the MF, strong electrostatic interactions are present for the majority of monomer combinations and conditions. Although the monomer consumption rate (Rp) increased up to 65% applying a MF of 0.1 Tesla, the composition of the resulting copolymers was not affected under such conditions. Despite this increase of Rp by MF, the electrostatic repulsion between ionic monomers and charged growing radicals dominates Rp and governs the copolymer composition with and without MF. The order of the experimentally obtained reactivity ratios reflects the extent of electrostatic interaction: rAM/AA (1.41) < r (3.10) < rAA/DADMAC (4.25) < rAM/DADMAC (6.95) and rAA/AM (2.20) > rDADMAC/AA (0.25) > r (0.17) > rDADMAC/AM (0.03). Overall, weak MF offers to reduce the production time without modifying the product composition. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 373,383, 2009 [source]

Anti-Biofouling Properties of Polymers with a Carboxybetaine Moiety

MACROMOLECULAR BIOSCIENCE, Issue 1 2009
Susumu Tada
Abstract The resistance of random copolymers of BMA and CMB against biofouling was evaluated. The amount of proteins adsorbed onto the CMB copolymers was smaller than that onto other polymers (non-ionic polymers and copolymers of ordinary ionic monomers and BMA) and decreased with an increase in the content of CMB residues. Furthermore, there was a dramatic decrease in the number of cells (platelets and fibroblasts) that adhered to the CMB copolymers compared with that to other polymers. In contrast with this, CMB copolymers were slightly perturbative to both complement and coagulation systems. However, the overall results suggest that zwitterionic moieties are effective for making polymer materials biocompatible due to their excellent anti-biofouling property. [source]