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Content available Influence of air content on thermal degradation of poly(ethylene terephthalate)
Rejmer Wojciech
Technical Sciences / University of Warmia and Mazury in Olsztyn
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2021
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nr 24(1)
183--193
EN
The aim of these research is to investigate the air content on aging of poly-(ethylene terephthalate) (PET) preforms. Three air pressures were selected and in each pressure 5 samples were aged during 21 days in 80°C. Three samples were selected to be cut for determination of density with the use of hydrostatic method. Sample mass, Young modulus and surface roughness were measured for each sample before and after aging and differences between those parameters were presented as results. The changes of parameters may lead to a conclusion that mechanism of polymeric chain oxidation is dominant during thermal aging of PET. However aging process is not the fastest in atmospheric pressure but in lower air contents. This effect may be caused by greater evaporation of small molecule degradation products and shifting of reaction equilibrium in the direction of further decomposition.
2
Content available Influence of plastic deformation on electrochemical properties of X5CrNi18-10 steel
Rejmer Wojciech
Technical Sciences / University of Warmia and Mazury in Olsztyn
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2020
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nr 23(3)
253--262
EN
The purpose of this study was to determine the effect of plastic deformation on the electrochemical properties of X5CrNi18-10 steel. The tested material belongs to the group of stainless steels with low carbon content, and it is used in many industries due to its high corrosion resistance. In most applications of the tested material, it is formed into complicated shapes and exposed to aggressive environments. Examples include the applications in medicine (implants) as well as in civil engineering and nuclear power plants. Different effects of deformation on anti-corrosion properties have been described in the literature. Samples with 5 different deformations were obtained in the present experiment. Electrochemical direct electrical current and alternating electrical current tests were performed for the obtained materials. The tests were carried out in a 1 molar sodium chloride solution. The study revealed an increase in the corrosion resistance of samples with increasing strain in the tested strain ranges.
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