Verification Stability of Anion-Exchange Membrane with Surface Modification with Application in Electrodialysis Process

The present work deals with verification stability of the prepared anion-exchange membrane with surface modification in the time. The surface modification of a commercial ultrafiltration poly(ethersulfone) membrane was carried out graft polymerization. Poly(styrene-co-divinylbenzene-co-4-vinylbenzylchloride) surface layer was covalently attached onto commercial ultrafiltration support layer. The membrane was tested from the point of view of water content, ion-exchange capacity, specific resistance, permselectivity, FT-IR spectroscopy and SEM analysis. The tested characteristics (IEC, permselectivity, resistances, structure) of the prepared membrane were same after one year from preparation. The prepared membranes can find use in electrodialysis processes

Preparation of Water-Borne Self-Crosslinking Polymeric Binder with Flash Rust Resistance

Příspěvek se týká snadné výroby samosíťujícího akrylového latexového pojiva obsahujícího nanočástice na bázi MgO v roli inhibitoru bleskové koroze. Začlenění nanostrukturního MgO bylo provedeno během syntézy latexu prováděné technikou semi-kontinuální emulzní polymerace. Pro zajištění kovalentního samosíťování s dihydrazidem kyseliny adipové byl do polymeru kopolymerován diacetonakrylamid. S ohledem na výchozí koncentraci nanostrukturního MgO (0,5 2 hm.%, vztaženo na monomery) byla sledována stabilita pojiv při skladování a lakařské vlastnosti. Bylo zjištěno, že všechna pojiva obsahující anorganické nanočástice vykazují dlouhodobou stabilitu při skladování a poskytují zesítěné transparentní nátěrové filmy s vysokým leskem. Pojiva syntetizovaná za použití 1 2 hm.% nanostrukturního MgO (vzhledem k monomerům) poskytovala nátěrové filmy se zvýšenou odolností vůči rozpouštědlům a výraznou inhibicí bleskové koroze.This paper deals with a facile fabrication of a self-crosslinking acrylic latex coating binder comprising embedded nanoparticles originated from MgO in the role of flash rust inhibitor. The incorporation of nanostructured MgO was performed during the latex synthesis carried out by a semi-continuous emulsion polymerization technique. For the covalent self-crosslinking, diacetone acrylamide was copolymerized into the polymer to provide sites for the subsequent reaction with adipic acid dihydrazide. The latex storage stability and coating performance were compared with respect to the concentration of incorporated nanoparticles (0.5 2 wt.% based on monomers). It was found that all coating binder compositions containing inorganic nanoparticles exhibited a long-term shelf-life stability and provided crosslinked smooth transparent coating films of high gloss. The binder compositions synthesized using 1 2 wt.% of nanostructured MgO (related to monomers) provided coatings with enhanced solvent resistance and inhibited flash rust pronouncedly