Physico-mechanical properties changes in virgin and recycled polyethylene fibers during recycling process

Abstract

The aim of this work is to study the changes of physico-mechanical properties of polyethylene during recycling stages. All raw materials were taken virgin and recycled polyethylene granules used for producing plastic bags. Initially they were identified with the vibration spectroscopy FT-IR and Raman, which marked the presence of additives in recycled samples. As recycling process was used as a micro-pilot system; comprising the melt flow index device and a universal mill grinding. Among mechanical properties that were identified were density, specific gravity, melt flow index, yield strength and elasticity modulus and tensile strength. From the results analysis were observed changes in physical and mechanical properties for polyethylene samples by recycling cycles.Cilj ovog rada je bio da se prouče promene fizičko-mehaničkih svojstava polietilena tokom faza reciklaže. Za ispitivanja su uzete čiste i reciklirane polietilenske granule, koje se koriste za proizvodnju plastičnih kesa. U početku su uzorci bili ispitani pomoću spektroskopije FTIR i Raman, čime je ustanovljeno prisustvo aditiva u recikliranim uzorcima. Proces reciklaže je korišćen kao mikro-pilot sistem; sadrži uređaj za protok i univerzalni mlin. Među mehaničkim osobinama, koje su identifikovane, su gustina, specifična težina, topivi indeks protoka, tečenje i modul elastičnosti i zatezna čvrstoća. Iz analize rezultata su primećene promene fizičkih i mehaničkih svojstava za reciklirane uzorke polietilenska.