Naslov
Mechanical and Chemical Recycling of Poly(Ethylene-Terephthalate)

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

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

Izvornik
The Conference on Industrial Pollution and Sustainable Development, Book of Abstracts / Glavič, Peter ; Simonič, Marjana - Maribor : Faculty of Chemistry and Chemical engineering, University of Maribor, 2005, 42-42

Skup
Industrial Pollution and Sustainable Development

Mjesto i datum
Maribor, Slovenija, 14.12.2005. - 17.12.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
poly(ethylene-terephthalate) PET; recycling

Sažetak
Ecological concerns provided the need for intensive research of waste polymers recycling. Poly(ethylene-terephthalate), PET, is polymer material, which is intensively used in many applications, mainly for production of bottles for storing soft drinks and mineral water. In recent years use of PET bottles is enormously growing as well as quantity of collected waste PET. For this reason mechanical and chemical recycling of PET are constantly developing. In this work mechanical and chemical recycling of PET were studied. Mechanical recycling of PET is carried out through preparation of PET/HDPE polymer blends with small content of HDPE (3 to 10 wt.-%). In order to improve the compatibility PET/HDPE blends were prepared with isocyanate compatiblizer. Recycled PET/HDPE blends were characterized by FTIR spectroscopy, differential scanning calorimetry (DSC) and melt flow rate (MFR). From obtained results it can be concluded that adding compatibilizers in polymer blends improves compatibility of polymers in PET/HDPE blends. Two different methods of chemical recycling were carried out: glycolysis and hydrolysis. Procedure of chemical recycling is PET depolymerization, which leads to formation of monomers or intermediates suitable for production of new polymers. The chemical recycling by glycolysis leads to formation of monomer bis (2-hydroxy ethyl)terephthalate (BHET) and PET oligomers containing hydroxyl and carboxyl end groups. Recycling by hydrolysis is followed by PET depolymerization and formation of monomers terephthalic acid (TPA) and ethylene glycol (EG). The obtained monomers and oligomers were separated and further characterized by FTIR spectroscopy and DSC. Results of chemical recycling procedures showed that hydrolysis is very efficient method for chemical recycling of PET because high content of monomers is obtained while glycolysis enables high content of oligomers.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA