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Vinylsulfonic Acid (vinylsulfonic + acid)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

Determination of ethyl sulfate , a marker for recent ethanol consumption , in human urine by CE with indirect UV detection

ELECTROPHORESIS, Issue 23 2006
Francesc A. Esteve-Turrillas
Abstract A CE method for the determination of the ethanol consumption marker ethyl sulfate,(EtS) in human urine was developed. Analysis was performed in negative polarity mode with a background electrolyte composed of 15,mM maleic acid, 1,mM phthalic acid, and 0.05,mM cetyltrimethylammonium bromide (CTAB) at pH,2.5 and indirect UV detection at 220,nm (300,nm reference wavelength). This buffer system provided selective separation conditions for EtS and vinylsulfonic acid, employed as internal standard, from urine matrix components. Sample pretreatment of urine was minimized to a 1:5 dilution with water. The optimized CE method was validated in the range of 5,700,mg/L using seven lots of urine. Intra- and inter-day precision and accuracy values, determined at 5, 60, and 700,mg/L with each lot of urine, fulfilled the requirements according to common guidelines for bioanalytical method validation. The application to forensic urine samples collected at autopsies as well as a successful cross-validation with a LC-MS/MS-based method confirmed the overall validity and real-world suitability of the developed expeditious CE assay (sample throughput 130 per day). [source]

Carrageenan- g -poly(acrylamide)/poly(vinylsulfonic acid, sodium salt) as a novel semi-IPN hydrogel: Synthesis, characterization, and swelling behavior

POLYMER ENGINEERING & SCIENCE, Issue 9 2007
Ali Pourjavadi
A semi-interpenetrating polymer network (semi-IPN) hydrogel based on kappa-carrageenan (,C) and poly (vinylsulfonic acid, sodium salt) (PVSA) was prepared by graft copolymerization of acrylamide (AAm) using methylenebisacrylamide (MBA) as a crosslinking agent and ammonium persulfate (APS) as an initiator. FTIR spectroscopy was used for confirming the structure of the final product. It was found that the chemical composition of the Semi-IPN hydrogel is equal to the initial homopolymers and monomer feed compositions. The swelling capacity of the hydrogel was shown to be affected by the MBA, APS, and AAm concentration as well as ,C/PVSA weight ratio. The swelling behavior of the hydrogel was also investigated in various pHs and salt solutions. Since the highly swelling biopolymer-based hydrogel exhibits low salt-sensitivity, it may be referred to as an anti-salt superabsorbent hydrogel. The swelling kinetics of the superabsorbent hydrogels was studied as well. POLYM. ENG. SCI., 47:1388,1395, 2007. © 2007 Society of Plastics Engineers [source]

Novel polymer electrolytes prepared by copolymerization of ionic liquid monomers

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 8 2002
Masahiro Yoshizawa
Abstract Ionic liquid monomer couples were prepared by the neutralization of 1-vinylimidazole with vinylsulfonic acid or 3-sulfopropyl acrylate. These ionic liquid monomer couples were viscous liquid at room temperature and showed low glass transition temperature (Tg) at ,83,°C and ,73,°C, respectively. These monomer couples were copolymerized to prepare ion conductive polymer matrix. Thus prepared ionic liquid copolymers had no carrier ions, and they showed very low ionic conductivity of below 10,9 S,cm,1. Equimolar amount of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to imidazolium salt unit was then added to generate carrier ions in the ionic liquid copolymers. Poly(vinylimidazolium-co-vinylsulfonate) containing equimolar LiTFSI showed the ionic conductivity of 4,×,10,8 S,cm,1 at 30,°C. Advanced copolymer, poly(vinylimidazolium-co-3-sulfopropyl acrylate) which has flexible spacer between the anionic charge and polymer main chain, showed the ionic conductivity of about 10,6 S,cm,1 at 30,°C, which is 100 times higher than that of copolymer without spacer. Even an excess amount of LiTFSI was added, the ionic conductivity of the copolymer kept this conductivity. This tendency is completely different from the typical polyether systems. Copyright © 2002 John Wiley & Sons, Ltd. [source]