20.500.12556/RUL-158722 Polimeri v konstrukcijah Polymers in structures Polimeri so v današnjem času nepogrešljivi inženirski materiali. V sklopu zaključne naloge smo z uporabo strokovne literature analizirali strukturo in lastnosti polimerov, ki vplivajo na njihovo uporabo v konstrukcijah. Cilj naloge je bil ugotoviti, kako hitrost spreminjanja temperature in izpostavljenost vremenskim vplivom vplivata na izbrane polimerne materiale. Eksperimente smo izvedli na polimerih: polikarbonat (PC), polimetil metakrilat (PMMA) in polioksimetilen (POM). S tehnikama diferenčne dinamične kalorimetrije in dinamične mehanske analize smo proučevali, kako se vrednost temperature steklastega prehoda (Tg) spreminja s spreminjanjem hitrosti segrevanja in ob izpostavljenosti vremenskim vplivom. Z višanjem hitrosti spreminjanja temperature je pri PC in PMMA naraščala temperatura začetka območja Tg, medtem ko, hitrost segrevanja ni imela vpliva na POM. Izpostavljenost vremenskim vplivom je povzročila veliko količino absorbirane vlage pri PMMA, medtem ko, so bile spremembe pri PC in POM zanemarljive. Polymers are indispensable engineering materials in today's time. In the scope of this thesis, we used technical literature to analyze the structure and properties of polymers that affect their use in structures. This thesis aims to determine how the rate of temperature change and exposure to weather conditions affect selected polymeric materials. Experiments were conducted on the polymers polycarbonate (PC), polymethyl methacrylate (PMMA), and polyoxymethylene (POM). Using the techniques of differential scanning calorimetry and dynamic mechanical analysis, we studied how the value of the glass transition temperature (Tg) changes when changing the heating rates or exposing the material to weather conditions. With increasing heating rates, the temperature at the beginning of the Tg range increased for PC and PMMA, while the change of heating rate had no effect on POM. Exposure to weather conditions caused a significant amount of moisture absorption in PMMA, while changes in PC and POM were negligible. polimeri v konstrukcijah diferencialna dinamična kalorimetrija dinamična mehanska analiza termične lastnosti vplivi iz okolja polymers in structures differential scanning calorimetry dynamic mechanical analysis thermal properties environmental influences true false false [I. Ž. Barbarić] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-06-20 07:30:16 2024-06-20 07:30:20 2024-07-23 13:13:18 0000-00-00 00:00:00 2024 0 Ljubljana 0 XII, 54 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.3:620.173.2:159.922.25(043.2) 260209 202565123 33398.pdf 33398.pdf 1 C71340EF85E435F7124A252C1DB5CE91 c3e579fed74d183cd254150705242476ba47235aee2445709fa6575231baecbc 30b9b1f5-2ec6-11ef-a73e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186436 Fakulteta za strojništvo 0 0 0