Naslov
Study of mechanically recycled PET/HDPE blends

Autori
Kratofil, Ljerka ; Hrnjak-Murgić, Zlata ; Jelenčić, Jasenka ; Ptiček, Anita

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program and book of abstracts, POLYCHAR-12, 12th Annual Polychar World Forum on Advanced Materials / Brostow, Witold - Guimaraes : Vila Nova de Gaia, 2004, 162-162

Skup
12th Annual Polychar World Forum on Advanced Materials

Mjesto i datum
Guimarães, Portugal, 06.01.2004. - 09.01.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polyethylene terephthalate; high density polyethylene; polymer blends; degradation; recycling

Sažetak
Large amount of polymer waste is a matter of a big concern. Since polymer materials are not biodegradable, a possible solution is the recycling of such material by thermo-mechanical techniques. This study takes into consideration the mechanical recycling of post-consumed plastic bottles made of poly(ethylene terephthalate), PET and high density polyethylene, HDPE. When polymer materials are mechanically recycled, they degrade due to the shear and heat in the processing step. It is of great importance to understand the degradation behaviour and to prevent it during recycling of polymer. The prepared polymer blends of post-consumer PET and HDPE were studied and characterized. Their properties show general tendencies in deterioration of properties during recycling process. For this purpose samples of PET/HDPE blends were prepared in Brabender plasticorder in various compositions and samples of PET/HDPE blends containing compatibilizer 2-hydroxyethyl methacrylate + hexamethylene diisocyanate were also characterized. Prepared blends were subjected to simulated recycling: they were ground into flakes and another cycle of mixing was carried out in Brabender plasticorder, the procedure of mixing was repeated few times. Samples were analyzed by differential scanning calorimetry (DSC) and melt flow rate (MFR) was determined. DSC results indicate that each thermal process that was applied on PET/HDPE blends increases the crystallinity and causes deterioration of properties. Studied PET/HDPE blends showed deterioration of properties with every new cycle of thermal mixing process, mainly due to immiscibility of PET and HDPE. Simulated recycling elucidates degradation processes which occur during mechanical recycling and enables to tailor the conditions of recycling process.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA