Damage function for poly(vinyl chloride) in heritage collections
| Autor: | Tjaša Rijavec, Matija Strlič, Irena Kralj Cigić |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
udc:543:678.743.2:7.025
funkcija škode PVC dediščinska znanost degradacija napoved aditivi Polymers and Plastics damage function udc:543 678 damage function PVC heritage science degradation prediction additives prediction dediščinska znanost Condensed Matter Physics PVC funkcija škode Mechanics of Materials aditivi Materials Chemistry additives heritage science degradacija napoved degradation |
| Zdroj: | Polymer degradation and stability, vol. 211, 110329, 2023. Polymer degradation and stability, str. 1-9 : Ilustr., Vol. 211, May 2023 COBISS-ID: 2814212 |
| ISSN: | 0141-3910 |
| Popis: | Yellowing of plastic objects as a consequence of chemical degradation is a common heritage conservation challenge. In the case of poly(vinyl chloride) elimination of hydrogen chloride leads to the formation of polyene sequences that act as chromophores. The objective of this work was to quantitatively evaluate the rate of degradation observed as yellowing, as relevant to room conditions during long-term storage of heritage collections. Degradation was quantified as increase in the b* colour coordinate during accelerated degradation at 50 and 70 °C as a function of temperature, relative humidity, plasticizer content, and polymer molecular weight. The significance of each variable was investigated with multiple linear regression. Lower temperature, lower relative humidity, higher polymer molecular weight and higher plasticizer content were associated with lower degradation rates. The activation energy of 86 kJ/mol was calculated. The concept of ‘1- °C-equivalent’ is introduced to enable variable prioritisation from a heritage management aspect. The resulting model can be used to shape environmental management guidelines and identify the most vulnerable objects in heritage collections. |
| Databáze: | OpenAIRE |
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