|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 10 van 12 gevonden artikelen
| Titel: |
The Photodegradation of a Polyamidehydroxyurethane Type Polymer in Aqueous Solution. The Influence of Metal Ions on the Process of Degradation |
| Auteur: |
Onu, Ana Palamaru, Mircea Tutovan, Elena Ciobanu, Constantin |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 39 (1998) nr. 1-2 pagina's 33-43 |
| Jaar: |
1998-01-01 |
| Inhoud: |
The photodegradation of a polyamidehydroxyurethane type polymer in aqueous solution in the presence of various metal ions has been studied. It has been ascertained, that Fe3 + ions accelerate the process of photodegradation; Mn2 +, Co2+, Cu2+, Cr3+ ions retard the process of degradation of the polymer. With increasing Fe3 + concentration, there increase the rate of the degradation and the values of the quantum yield of chain scission, φcs. At greater Fe3 + concentrations, there is observed a stabilization of the degradation by the end of the process, that fact means that in this case the number of macroradicals recombinations is greater than that, at less Fe3+ concentrations. The photocatalytic role of Fe3+ ions has been related to the formaion of the OH radicals. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 12 gevonden artikelen
| << vorige | volgende >> |