Kelly A.M.,Polymer Competence Center Leoben |
Kaltenhauser V.,University of Graz |
Muhlbacher I.,Polymer Competence Center Leoben |
Rametsteiner K.,KE KELIT GmbH |
And 5 more authors.
Macromolecular Bioscience | Year: 2013
A set of poly(2-oxazoline)-derived (co-)polymers was prepared by microwave-assisted polymerizations and acid-mediated hydrolysis and tested for antimicrobial activity in 50×50×2mm PP compound plates containing 5wt% of the polymers. Antimicrobial activity against gram-negative E. coli and P. aeruginosa as well as C. albicans depended only on the degree of hydrolysis, while antimicrobial activity against gram-positive S. aureus was only observed for hydrolyzed poly(2-nonyl-2-oxazoline)s. The surface energies of the compound plates compared to pure PP were hardly altered, and the compounds can be considered as alternatives for PP. The presence of the biocide additives at the surface of the PP compound plates could be shown by combined ATR-IR, zeta potential, and SEM-EDX measurements. Antimicrobial activity was maintained during double incubation as well as for lowered amounts of the biocide additive of 1% in PP compound plates. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
VARTA Micro Innovation GmbH | Date: 2011-08-12
A paste for producing electrodes for lithium ion batteries includes as electrochemically active material particles of at least one of a metal/semimetal selected from the group consisting of silicon, aluminium, antimony, tin, cobalt and carbon-based particles which intercalate lithium, a binder based on a polysaccharide, water as a solvent, and an aliphatic polyester having a molar mass of 150 to 500 g/mol or an hydroxycarboxylic ester having a molar mass of 150 to 500 g/mol as a plasticizer.
VARTA Micro Innovation GmbH | Date: 2012-09-19
A process of producing active material for an electrode of an electrochemical cell includes providing lithium-intercalating carbon particles having an average particle size of 1 m to 100 m as component 1, providing silicon particles having an average particle size of 5 nm to 500 nm as component 2, providing a polymer or polymer precursor which can be pyrolyzed to form amorphous carbon and is selected from the group consisting of epoxy resin, polyurethane resin and polyester resin, as component 3, mixing components 1 to 3 in to a mixture and heat treating the mixture substatually in the absence of atmospheric oxygen at a temperature at which the pyrolyzable polymer or the pyrolyzable polymer precursor decomposes to form amorphous carbon.
VARTA Micro Innovation GmbH | Date: 2012-02-10
A method of producing electrodes for lithium ion batteries including forming the electrodes formed by electro-chemical deposition, from a mixture including particles made of at least one electrochemically active material, a binder and a solvent and/or dispersing agent.
Varta Micro Innovation Gmbh | Date: 2011-11-11
A formed, secondary electrochemical cell includes at least one positive electrode containing a metal compound capable of reversibly incorporating and releasing lithium in the form of ions, at least one negative electrode containing a carbon compound capable of reversibly incurporating or releasing lithium in the form of ions, and/or a metal and/or semi-metal which can be alloyed with lithium, an electrolyte via which lithium ions can migrate between the at least one positive electrode and the at least one negative electrode, and mobile lithium available for incorporation or releasing processes in the electrodes, wherein capacity of the at least one negative electrode for taking up lithium is higher than that of the at least one positive electrode, the at least one negative electrode has a higher capacity than required for taking up the entire mobile lithium contained in the cell, and the mobile lithium is contained in the cell in an amount which exceeds the capacity of the at least one positive electrode for taking up lithium.