20.500.12556/DKUM-45471 DOLOČANJE TALIŠČ POLIETILEN GLIKOLOV PRI VISOKIH TLAKIH PLINOV MELTING POINTS OF POLYETHYLENE GLYCOL UNDER HIGH PRESSURE OF GAS Namen diplomskega dela je preučevanje temperature tališča polietilen glikola različnih molskih mas pri raznih nadtlakih argona in načrtovanje talilne krivulje binarnega sistema ter njena primerjava s podobnimi binarnimi sistemi, najdenimi v različni literaturi. Izmerjene so bile temperature tališča (TTpov) polietilen glikola molskih mas 1 500 g/mol, 4 000 g/mol, 10 000 g/mol in 35 000 g/mol pri različnih nadtlakih argona (Pnad) v visokotlačni optični celici vse do 30 MPa. Te temperature so bile nato preračunane v reducirano temperaturo tališča (TTred), da smo lahko naš binarni sistem primerjali z binarnim sistemom polietilen glikol/ogljikov dioksid. Izmerjena je bila tudi latentna talilna toplota (ΔtalH) polimera na dva načina. Za prvo določitev smo uporabili Clapeyron-ovo enačbo in interpolacijo izmerjenih temperatur tališča v odvisnosti od nadtlaka argona. Druga določitev je potekala neposredno v diferenčnem dinamičnem kalorimetru; rezultate smo nadalje uporabljali v izračunih topnosti. Na podlagi padca temperature tališča smo ob upoštevanju koligativnih lastnosti lahko izračunali topnost superkritičnega fluida v polimeru. V ta namen je bila izpeljana nova enačba topnosti (S) iz že znanih korelacij krioskopije. The goal of the presented diploma thesis was to research the melting temperature of polyethylene glycol with different molar masses under various pressures of argon gas and the formulation and comparison of the melting curve for the given binary system with other binary systems found in different literature. Measured were the melting temperatures (TTpov) of polyethylene glycol with molar masses 1 500 g/mol, 4 000 g/mol, 10 000 g/mol and 35 000 g/mol in different overpressures of argon (Pnad) in a high-pressure optical cell up to 30 MPa. These temperatures were then calculated to “reduced melting temperatures” (TTred), so that our binary system could be compared to the binary system polyethylene glycol/carbon dioxide. The latent heat of fusion (ΔtalH) was measured using two methods. The first contained the use of the Clapeyron equation and the interpolation of the measured melting temperatures in dependence of argon overpressure. The second method consisted of the direct measurement of the latent heat of fusion in the Differential Scanning Calorimeter, which values were later used for the calculation of solubility. Considering the colligative properties and the observed reduction of melting temperature we were able to determine the solubility of supercritical argon in the polymer. For this purpose a new equation of solubility (S) was derived from the already known correlations of cryoscopy. PEG argon tališče optična celica latentna talilna toplota topnost PEG argon melting point optical cell latent heat of fusion solubility true true false [G. Zajc] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2014-08-26 20:56:33 2014-09-22 20:29:02 2022-05-15 03:07:41 2021-04-30 03:23:00 2014 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.652:546.293(043.2) 18225430 URN:SI:UM:DK:TMMOE60Q UNI_Zajc_Gasper_2014.pdf UNI_Zajc_Gasper_2014.pdf 1 9D045FDA5C7767123CD7F8D1382F8D21 f91b09c2e646f9f2c2a7decaef38da2f59ea23801faac09661e2c5d64afae0da 30af5ff2-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=66869 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0