Naslov
Thermal degradation of polyurethane elastomers: determination of kinetic parameters

Autori
Govorčin Bajsić, Emi ; Rek, Vesna ; Agić, Ante

Izvornik
Journal of elastomers and plastics (0095-2443) 35 (2003), 4; 311-323

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
thermal degradation; polyurethane elastomers; kinetics

Sažetak
The objective of this study is determining the kinetic parameters of thermal degradation of polyurethane elastomers before and after UV irradiation. To determine the kinetic parameters of PUR decomposition the Freeman-Carroll method of calculation applied. The effect of soft segment and hard segment type, soft segment molecular weight and hard segment content on the kinetic parameters of the degradation process was measured. Polyurethane elastomers were obtained from poly(oxytetramethylene) glycol, PTMO, of 1000 and 2000 molecular weight and polycaprolactone glycol of 1250 molecular weight (PCL), 4, 4' diphenylmethan diisocyanate (MDI) and 4, 4'-dicyclohexylmethane diisocyanate (H12MDI) and 1, 4-butanediol as chain extender. The activation energy values obtained for PUR elastomers based on polyester soft segment were higher than those based on polyether soft segment.The PUR elastomers based on aromatic type of diisocyanate have lower activation energy values than those based on cycloaliphatic type of diisocyanate.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA