Institute for Engineering of Polymer Materials and Dies

Piastów, Poland

Institute for Engineering of Polymer Materials and Dies

Piastów, Poland

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Konieczny J.,Silesian University of Technology | Chmielnicki B.,Institute for Engineering of Polymer Materials and Dies | Tomiczek B.,Silesian University of Technology
Advanced Materials Research | Year: 2014

The aim of the work is to employ the artificial neural networks for prediction of hardness of the alloyed copper like CuTi, CuFe, CuCr and CuNiSi. In this paper it has been presented an original trial of prediction of the required hardness of the alloyed copper like CuTi, CuFe, CuCr and CuNiSi. Artificial neural networks, can be applied for predicting the effect of the chemical composition, parameters of heat treatment and cold working deformation degree on the hardness. It has been assumed that the artificial neural networks can be used to assign the relationship between the chemical compositions of alloyed copper, temperature and time of solution heat treatment, degree of cold working deformation and temperature and time of ageing. In order to determine the relationship it has been necessary to work out a suitable calculation model. It has been proved that employment of genetic algorithm to selection of input neurons can be very useful tool to improve artificial neural network calculation results. The attempt to use the artificial neural networks for predicting the effect of the chemical composition and parameters of heat treatment and cold working deformation degree on the hardness succeeded, as the level of the obtained results was acceptable. Worked out model should be used for prediction of hardness only in particular groups of alloyed copper, mostly because of the discontinuous character of input data. The results of research make it possible to calculate with a certain admissible error the hardness value basing on combinations of concentrations of the particular elements, heat treatment parameters and cold working deformation degree. © (2014) Trans Tech Publications, Switzerland.


Sobczak M.,Medical University of Warsaw | Debek C.,Institute for Engineering of Polymer Materials and Dies | Oledzka E.,Medical University of Warsaw | Nalecz-Jawecki G.,Medical University of Warsaw | And 2 more authors.
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2012

A series of biomedical polyurethane elastomers (PURs) based on poly(ester-carbonate)s (PECs) and polycarbonates (PCs) were synthesized and spectrally characterized fully. PEC or PC diols were synthesized by the ring-opening polymerization of ε-caprolactone, trimethylene carbonate, and neopentyl carbonate catalyzed by lipase from Candida antarctica. PURs were prepared by free-metal method from PEC or PC diols and 4,4'-methylenebis(phenyl isocyanate), with 1,4-butanediol as a chain extender. The physical and mechanical properties as well as hydrolytic stability of the obtained PURs were determined. The toxicity of the received polymers was evaluated using bacterial luminescence test and two protozoans assays. The presented preliminary studies suggest that PEC or PC diols prepared in this way might be applied for the synthesis of biomedical PURs with improved hydrolytic stability. © 2012 Wiley Periodicals, Inc.


Kolmas J.,Medical University of Warsaw | Sobczak M.,Medical University of Warsaw | Oledzka E.,Medical University of Warsaw | Nalecz-Jawecki G.,Medical University of Warsaw | Debek C.,Institute for Engineering of Polymer Materials and Dies
International Journal of Molecular Sciences | Year: 2014

In this study, new composite bisphosphonate delivery systems were obtained from polyurethanes (PUs) and nanocrystalline hydroxyapatite (HA). The biodegradable PUs were first synthesized from poly(ε-caprolactone) diols (PCL diols), poly(ethylene adipate) diol, 1,6-hexamethylene diisocyanate, 1,4-butanediol and HA. Moreover, the PCL diols were synthesized by the ring-opening polymerization catalysed by the lipase from Candida antarctica. Next, composite drug delivery systems for clodronate were prepared. The mechanical properties of the obtained biomaterials were determined. The cytotoxicity of the synthesized polymers was tested. The preliminary results show that the obtained composites are perspective biomaterials and they can be potentially applied in the technology of implantation drug delivery systems. © 2014 by the authors; licensee MDPI, Basel, Switzerland.


Sobczak M.,Medical University of Warsaw | Debek C.,Institute for Engineering of Polymer Materials and Dies | Gos P.,Medical University of Warsaw
E-Polymers | Year: 2010

A series of polyurethanes (PURs) were prepared by metal-free method, containing polycaprolactone (PCL) as the soft segment with molecular weights of 1600, 2400 and 2600. PCL was obtained by the ring-opening polymerization of e-caprolactone in the presence L-alanine and L-phenyloalanine. The structure of synthesized oligoesters and PURs were spectroscopically confirmed. The molecular weights, mechanical and thermal properties of the obtained materials were reported.


Sobczak M.,Medical University of Warsaw | Kamysz W.,Medical University of Gdańsk | Tyszkiewicz W.,Military Institute of Chemistry and Radiometry | Debek C.,Institute for Engineering of Polymer Materials and Dies | And 7 more authors.
Reactive and Functional Polymers | Year: 2014

The effective synthesis of citropin-polymer conjugates was described in this paper. The obtained biodegradable polymeric matrices and polymeric conjugates were characterized using 1H or 13C NMR and Fourier transform infrared spectroscopies, gel permeation chromatography and scanning electron microscopy. Toxicity of polymers was evaluated with bacterial luminescence test and two protozoan assays. The in vitro release study of citropin from the obtained conjugates was investigated. The preliminary results of antimicrobial activity of the obtained macromolecular conjugates against Bacillus anthracis, Enterococcus hirae and Staphylococcus aureus were also discussed. The peptide had a high level of antimicrobial activity during 3-5 weeks of the degradation process. The development of biodegradable citropin systems should be of a great interest in the delivery systems of antimicrobial agents. © 2014 Published by Elsevier B.V.


PubMed | Medical University of Warsaw and Institute for Engineering of Polymer Materials and Dies
Type: Evaluation Studies | Journal: International journal of molecular sciences | Year: 2014

In this study, new composite bisphosphonate delivery systems were obtained from polyurethanes (PUs) and nanocrystalline hydroxyapatite (HA). The biodegradable PUs were first synthesized from poly(-caprolactone) diols (PCL diols), poly(ethylene adipate) diol, 1,6-hexamethylene diisocyanate, 1,4-butanediol and HA. Moreover, the PCL diols were synthesized by the ring-opening polymerization catalysed by the lipase from Candida antarctica. Next, composite drug delivery systems for clodronate were prepared. The mechanical properties of the obtained biomaterials were determined. The cytotoxicity of the synthesized polymers was tested. The preliminary results show that the obtained composites are perspective biomaterials and they can be potentially applied in the technology of implantation drug delivery systems.


Sasimowski E.,Lublin University of Technology | Sikora J.W.,Lublin University of Technology | Krolikowski B.,Institute for Engineering of Polymer Materials and Dies
Polimery/Polymers | Year: 2014

The paper presents a description of a modern direct screw drive carried out by a torque motor of a torque 300 Nm, maximum rotational speed 500 rpm and power 15.7 kW. The operation of the torque, its advantages and disadvantages were described. In the extruder plasticizing system in the feed opening zone and part of the feed zone, an exchangeable smooth sleeve and a grooved sleeve with 6 or 8 longitudinal grooves were used. For research, low density polyethylene of the commercial name MalenE and symbol FGNX 23-D006 was used. In the extruder barrel, a special screw was mounted 25 mm in diameter and L/D = 24, with elements of intensive shearing and mixing, constructionally adapted to the grooved section. The research was conducted in the wide range of rotational screw speeds from 1.67 to 8.33 rps.


Debek C.,Institute for Engineering of Polymer Materials and Dies | Walendziewski J.,Wroclaw University of Technology
Fuel | Year: 2015

In the pilot plant for pyrolysis of whole tyres for passenger cars and vans we received a liquid product, hydrocarbon fraction known as pyrolytic oil, two solid products, i.e. pyrolytic carbon, scrap metal cord and gaseous mixture of hydrocarbons. The main goal of the research was to determine susceptibility of the obtained pyrolytic oils to hydrorefining. The analysis showed that hydrorefining process, carried out in the presence of commercial catalysts, allows for much improvement of its characteristics. However, it is necessary to apply relatively hard process conditions: temperature of at least 360°C and hydrogen pressure of about 5 MPa. Then the product is desulphurised down to the sulphur content of less than 0.2% by weight and the unsaturated hydrocarbons are partially hydrogenated, which is characterised by the decrease of bromine number to less than 20 g Br2/100 g. As a result of high content of aromatic hydrocarbons, in respect of relatively high sulphur content, high density and low cetane index (lower than 35), even after hydrorefining process, pyrolytic oil can only be used as a component of fuel oils.

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