Naslov
UV Degradation of Polyurethane

Autori
Rek, Vesna

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Natural and Artificial Ageing of Polymers

Urednik/ci
Reichert, Thomas

Izdavač
Gesellschaft für Umweltsimulation e.V.

Grad
Pfinztal

Godina
2007

Raspon stranica
413-422

ISBN
978-3-9810472-3-3

Ključne riječi
Photodegradation, Polyurethane, Molecular Mass, Spectroscopic measurements

Sažetak
The course and intensity of polyurethane, PUR, photodegradation depend on the dyiisocianate and polyol nature. In the paper the structural changes of PUR on the base of the two different types of polyester polyol used in PUR synthesis were studied. Linear polyurethane prepolymers were synthesized starting from diphenylmethane-4, 4'-diisocianate, MDI, and polyester polyols. Two different types of polyester diols were used: poly(ethylene adipate) and poly(ethylene/butylene adipate). The effects of UV irradiation on the photooxidative degradation of prepared PUR prepolymer were studied. The changes in the chain length and their distribution as well as the changes in chemical structure were followed. Comparative investigations were performed by gel permeation chromatography, GPC, by spectroscopic and viscometric measurements. The results show pronounced heterogenity of the degradative reactions. The GPC results show that the photooxidative decomposition is followed by a decrease in molecular mass together with an increase in polydispersity. This indicates a very inhomogenous degradation, which is a consequence of the specific course and of the intensity of photooxidative degradation. This was confirmed by means of comparative IR and NMR measurements. Conclusions on the difference in behaviour of the different types of polyester polyols used in PUR synthesis were discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA