Inhibiting the deterioration of plasticised poly (vinyl chloride) in museum collections

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

4 Downloads (Pure)

Abstract

Plasticized poly (vinyl chloride) (PVC) is found in museum collections as three dimensional objects and as packaging materials. Many PVC materials deteriorate within 25 years of acquisition. Migration and chemical breakdown of plasticizer, accompanied by dehydrochlorination of the polymer are the major mechanisms of deterioration.

The extent, rate and mechanisms of deterioration of new and naturally aged PVC containing di (2-ethylhexyl) phthalate (DEHP), the most commonly used plasticizer, were examined during accelerated thermal ageing in various environments. Weight loss was used to quantify loss of plasticizer. Attenuated Total Reflection Fourier Transform Infrared spectroscopy was used to quantify concentration of DEHP at surfaces of PVC. Distribution of DEHP was mapped using Low Vacuum Scanning Electron Microscopy. Optical densitometry was used to quantify darkening of samples.

Degradation of new and deteriorated PVC was inhibited by enclosure in a non-adsorbent material such as glass, containing still air. Such storage minimized migration and loss of DEHP.
Original languageEnglish
Title of host publicationConservation Science 2002 Preventive Conservation
EditorsJoyce Townsend, Katherine Eremin
Place of PublicationLondon
PublisherArchetype Publications Ltd
Publication date2003
Pages58-64
Chapter10
ISBN (Print)1-873132-88-3
Publication statusPublished - 2003

Keywords

  • PVC, plasticizer, phthalate, DEHP, ATR-FTIR, scanning electron microscopy

Cite this