20.500.12556/RUL-167575 Heritage PVC objects understanding the diffusion-evaporation of plasticizers The predominance of diffusion-evaporation of plasticizers in heritage collections is investigated and an analytical method of studying surface exudates based on dry swabbing is introduced for an in-situ museum survey. Most plasticized heritage PVC objects exhibit no visible surface exudates, indicating plasticizer loss is governed by the diffusion-evaporation process and not phase-separation. A new approach to analyzing the diffusion-evaporation process based on experimental data is presented to model plasticizer loss at room conditions. Experiments conducted with historical PVC objects exposed to accelerated degradation for up to 8 weeks at moderate temperatures enable the monitoring of plasticizer loss. Evaluation of the mass loss and the chromatographically determined plasticizer content allows us to determine the temperature dependence of the diffusion coefficient and the surface emission coefficient. Three representative groups of heritage PVC are identified and the activation energies for the coupled diffusion-evaporation processes are used to determine the rate-limiting step and introduce a general model for predicting plasticizer loss from the time of storage, temperature, and thickness of an object. The model can be used as part of risk assessment in heritage PVC collections. heritage science diffusion-evaporation migration modelling art conservation risk assessment degradation dediščinska znanost difuzija izhlapevanje migracija modeliranje konservatorstvo umetnin ocena tveganja razgradnja true false true Angleški jezik Slovenski jezik Članek v reviji 2025-02-28 11:59:57 2025-02-28 11:59:59 2025-03-14 10:03:42 0000-00-00 00:00:00 2025 0 0 11 str. Vol. 235, art. 111270 May 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 543.42:678.743.2:7.025 0141-3910 10.1016/j.polymdegradstab.2025.111270 227556611 RAZ_Rijavec_Tjasa_2025.pdf RAZ_Rijavec_Tjasa_2025.pdf 1 6826739827979EADD10EFE0902C4F49B 53df4d766356c7336b5a472ebe97eb3e2c50682400e61bd7c67738595f2610ba c0f38d62-f5c3-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200226 https://www.sciencedirect.com/science/article/pii/S0141391025001004 1 3ba21f20-f5c2-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200225 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0