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Pilch-Pitera B.,Rzeszow University of Technology | Kedzierski M.,Industrial Chemistry Research Institute ICRI | Olejnik E.,AGH University of Science and Technology | Zapotoczny S.,Jagiellonian University
Progress in Organic Coatings | Year: 2016

In this study, polyurethane powder clear coating systems consisting of polyester resin, blocked polyisocyanate and hydrotalcites (HT) intercalated with carbonate, aminododecanate, and ethylenediaminetetraacetate were examined. The blocked polyisocyanate crosslinkers for powder coatings were synthesized using trimethyhexamethylene diisocyanate (TMDI), formic acid, ε-caprolactam, dibutyltin dilaurate and triethylamine as catalysts. The powder coatings were investigated by atomic force microscopy (AFM) and X-ray diffraction analysis (XRD). The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: contact angle, surface free energy, gloss, elasticity, cupping, impact and scratch resistance, hardness as well as adhesion to steel surface. © 2016 Elsevier B.V. Source


Pilch-Pitera B.,Rzeszow University of Technology | Kozakiewicz J.,Industrial Chemistry Research Institute ICRI | Ofat I.,Industrial Chemistry Research Institute ICRI | Trzaskowska J.,Industrial Chemistry Research Institute ICRI | Spirkova M.,Czech Institute of Macromolecular Chemical
Progress in Organic Coatings | Year: 2015

Polyurethane powder coating systems consisting of polyester resin, blocked polyisocyanate and two types of "nanopowders" containing core-shell nanoparticles where the core was silicone resin of very low glass transition temperature and the shell was poly(methyl methacrylate) were examined. The blocked polyisocyanate was synthesized using biuretpolyisocyanate obtained from ureapolyisocyanate as starting material capable for blocking and ∈-caprolactam as blocking agent. The surface properties of cured powder coatings were investigated using scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: contact angle, surface free energy, gloss, abrasion resistance, hardness and adhesion to the steel surface. © 2014 Elsevier B.V. Source


Firlik S.,Industrial Chemistry Research Institute ICRI | Skupinski W.,Industrial Chemistry Research Institute ICRI | Wielgosz Z.,Industrial Chemistry Research Institute ICRI | Stasinski J.,Industrial Chemistry Research Institute ICRI
Polimery/Polymers | Year: 2015

The aim of this work was to examine the aminosilane ligands for the copper(II) salts and their application as catalysts for the oxidative polymerization of 2,6-dimethylphenol leading to poly(2,6-dimethyl- 1,4-phenylene ether) (PPE) [also known as poly(phenylene oxide) (PPO)] formation. As aminosilane ligands, silane derivatives containing primary and/or secondary amino groups were tested. Among aminosilanes used, PPE was only obtained when N-methylaminopropyltrimetoxysilane (MAPTMS) as a ligand for copper(II) was used. CuCl2 and CuBr2 were compared as catalyst precursors for 2,6-dimethylphenol polymerization and influence of N/Cu molar ratio in the range from 80 to 160 on PPE yield and its Mw was tested. It was observed, that with increasing N/Cu molar ratio from 80 to 120, both PPE yield andMw increased. PPE with the highestMw was obtained when CuBr2-MAPTMS as a catalyst was used. At N/Cu molar ratio equal to 160, a decrease in PPEMw obtained with use of both precursors and decrease in PPE yield for CuCl2-MAPTMS catalyst were noticed. The condensed nanoorganosilicon particles of spherical shape well dispersed in PPE were determined in the polymer matrix. The UV-Vis studies showed that, strong ligand field of the aminosilane ligand easier electron transfer from monomer to Cu(II) and thus polymerization facilitate. Source

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