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Waczynski K.,Silesian University of Technology | Waczynska-Niemiec N.,Silesian University of Technology | Wrobel E.,Silesian University of Technology | Majewska J.,Silesian University of Technology | Libera M.,Centrum Materialow Polimerowych i Weglowych PAN
Przeglad Elektrotechniczny | Year: 2015

This paper gives a result of the derivatographic investigation of SnCl4·5H2O+IPA solutions, which are used to production of tin dioxide thin sensoric films. The most important step in this process is forming the final properties of spinned SnO2 gel layer during the annealing at a temperature to 1000°C. The transformations, which occur in the solution during the process of spinning and annealing, have a decisive influence on the final properties of the layer. Transformations taking place in the structure of the SnO2 layer are in corelation with the surface morphology examined by scanning electron microscopy. © 2015, Kluwer Academic Publishers. All Rights Reserved. Source

Brzeska J.,Maritime Academy of Gdynia | Dacko P.,Centrum Materialow Polimerowych i Weglowych PAN | Janeczek H.,Centrum Materialow Polimerowych i Weglowych PAN | Kowalczuk M.,Centrum Materialow Polimerowych i Weglowych PAN | And 2 more authors.
Polimery/Polymers | Year: 2010

Polyurethanes (PUR) containing 37 % of soft segments, obtained by prepolymer chain extension in the reaction of diphenylmethane 4,4′-diisocyanate (MDI) with 1,4-butanediol (1,4-BD) were synthesized. Soft segments of PUR were built either of poly([R,S]-3-hydroxybutyrate) (a-PHB) and polycaprolactonediol (PCL) or a-PHB and polyoxytetramethylenediol (PTMG) (Table 1). The effects of a presence of synthetic a-PHB in the PUR chain on the thermal and mechanical properties, water and vegetable oil sorption and sterilization efficiency of the materials prepared, designed to medical applications, were investigated. It was shown by DSC method that the introduction of a-PHB with methyl side group to the soft segment disturbed phase segmentation leading to glass transition temperature (Tg) shift to higher values (Tables 2, 3). The presence of a-PHB in the chain increases the hydrophilicity of the products, causing better water absorption and lower absorption of vegetable oil (Table 4, Fig. 1). The results of microbiological tests and the mechanical properties of a-PHB containing PUR samples show that such materials can be subjected to plasma sterilization without surface flaw (Table 5) and PUR obtained can be used for medical applications if not high mechanical strength is required. Source

Konieczkowska J.,Centrum Materialow Polimerowych i Weglowych PAN | Schab-Balcerzak E.,Centrum Materialow Polimerowych i Weglowych PAN
Polimery/Polymers | Year: 2015

The paper is a literature review on photoactive supramolecular polymers formed through noncovalent interactions, i.e. hydrogen bonds between azo chromophore molecules and macromolecule chains. The individual kinds of such polymers as well as the results of photoinduced optical anisotropy investigations related to them have been presented. The supramolecular azopolymers based on hydrogen bonds have been compared with (i) systems containing chromophores dispersed in polymer matrix, (ii) supramolecular systems based on ionic interactions and (iii) functionalized azopolymers. Additionally, the methods used for the identification of hydrogen bonds in supramolecular azopolymers were discussed. © by Instytut Chemii Przemysłowej im. prof. Ignacego Mos̈ecickiego. Source

Brzeska J.,Maritime Academy of Gdynia | Heimowska A.,Maritime Academy of Gdynia | Morawska M.,Maritime Academy of Gdynia | Niepsuj A.,Maritime Academy of Gdynia | And 3 more authors.
Polimery/Polymers | Year: 2015

Polyurethanes synthesized from biocompatible components were used to produce composites with 5 and 10 wt % chitosan content. The hard segments of polyurethanes were obtained from aliphatic 4,4′-methylene dicyclohexyl diisocyanate and 1,4-butanediol, while the soft segmentswere derived from polycaprolactonediol and synthetic poly([R,S]-3-hydroxybutyrate) in aweight ratio of 90:10 or 80:20. The hardness of polyurethanes and their composites with chitosanwas typical for elastomers used in medicine. DSC thermograms showed that the investigated polymers were semicrystalline. The morphology of their surface observed under optical microscopewas heterogeneous. The presence of chitosan in the composites reduced their water vapour permeability, resulting at the same time in an increased water sorption, while not influencing the oil sorption of polymer samples. Source

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