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Dworak A.,Centrum Materialow Polimerowych i Weglowych | Dworak A.,University of Opole | Trzebicka B.,Centrum Materialow Polimerowych i Weglowych | Kowalczuk A.,Centrum Materialow Polimerowych i Weglowych | And 4 more authors.
Polimery/Polymers | Year: 2012

Two kinds of termosensitive star polymers have been synthesized: stars with arms of poly(2-ethyl-2-oxazoline) and stars with arms of poly(tert-butyl glycidyl ether)-b-(polyglycidol). Under applied polymerization methods (living anionic and living cationic polymerization) the topology of the obtained polymers (number and length of star arms) have been controlled and low molar mass dispersities achieved. By the proper choice of structural parameters (nature of the core and the arms and, in the case of copolymer stars, the composition of the arms) polymers ranging from water soluble to termosensitive polymers of controlled cloud point temperature in water have been obtained. The star structure has been correlated with their thermosensitivity.


Grabowska B.,AGH University of Science and Technology | Pilch-Pitera B.,Rzeszow University of Technology | Kaczmarska K.,AGH University of Science and Technology | Trzebicka B.,Centrum Materialow Polimerowych i Weglowych | And 3 more authors.
Polimery/Polymers | Year: 2015

The selected physicochemical properties of water-thinnable poly(acrylic acid)/sodium salt of carboxymethyl starch (PAA/CMS-Na) compositions - new environmentally friendly polymer binding agents-were investigated as a function of time. The aqueous composition PAA/CMS-Na was stored in closed vessels in a cooling chamber at 10 °C. During the three-month storage period the changes of coloration, viscosity, wetting angle on quartz glass, structure and size distribution of the binding agent particles were studied. On this basis, the stability of the binder properties was preliminarily evaluated. Additionally, the moulding sands containing an aqueous composition PAA/CMS-Na as a binder (stored for a week or three months) were prepared, hardened and subjected to the bending strength tests. It was found, that after three months of storage under conditions resembling those found in a foundry the new binder did not lose its properties as a binding agent for the moulding sand. © 2015 by Instytut Chemii Przemysłowej im. prof. Ignacego Mos̈cickiego.

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