20.500.12556/RUL-110162 Vpliv recikliranja polietilena visoke gostote na površinske mehanske lastnosti polimernega izdelka Effect of HDPE recycling on the surface mechanical properties of polymer product Polietilen visoke gostote je eden izmed najpogosteje uporabljanih polimernih materialov. Zaradi želje po ohranitvi okolja in pomanjkanju surovin za izdelke iz polimernih mas (zlasti v bližnji prihodnosti) se vzpodbuja njihovo recikliranje. Vendar se po večkratni predelavi istega materiala njegove mehanske lastnosti spremenijo do te mere, da bi ga lahko obravnavali že kot drugačno snov. V okviru raziskovalne naloge smo preverili, ali lahko napovemo modul elastičnosti in trdoto mešanic nepredelanega in recikliranega HDPE po pravilu mešanja. Mehanske lastnosti smo merili pri 6 različnih deležih tako za 10- kot tudi 30-krat recikliran material. Za vsako razmerje smo izdelali vzorce in na njih izvedli meritve z nanoindentacijo po metodi CSM. Rezultati so pokazali, da niti trdote niti modula elastičnosti nobene izmed izbranih mešanic ne moremo napovedati po pravilu mešanja. High density polyethylene is one of the most commonly used polymer materials. In the desire to protect and preserve the environment we live in and due to lack of raw materials for polymer products (especially in the near future) recycling of such material is being highly promoted. But after multiple processing cycles of the same material its mechanical properties change so much we could treat it as a completely different material. During this research we investigated whether we could predict elastic modulus and hardness of mixtures prepared from virgin and recycled HDPE with the rule of mixtures. We measured mechanical properties of samples with different parts of 10- and 30- times recycled material. For each sample with different concentration of recycled material we performed the measurements with nanoindenter using the CSM method. The results showed that we cannot predict neither elastic modulus nor hardness of the chosen mixtures with the rule of mixtures. polietileni visoke gostote recikliranje nanoindentacija modul elastičnosti trdota high density polyethylene recycling nanoindentation elastic modulus hardness true false false [V. Gale] Slovenski jezik Angleški jezik Zaključna naloga 2019-09-12 12:02:16 2019-09-12 12:02:18 2023-11-14 12:54:48 0000-00-00 00:00:00 2019 0 Ljubljana 0 XIV, 32 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 678.742.2:678.058.6:620.17(043.2) 216773 16916251 4306.pdf 4306.pdf 1 37E0B139B3349733741B3E824BD8DBD3 00e124ab95425eba468c72103bafb427cf6a1cf8934934e2df615a629f44cffd 0da0ec16-a1b7-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=121800 Fakulteta za strojništvo 0 0 0