Long-term heat stabilisation by (natural) polyols in heavy metal- and zinc-free poly(vinyl chloride)

J. van Steenwijk, R. Langerock, D.S. van Es, J. van Haveren, J.W. Geus, L.W. Jenneskens

    Research output: Contribution to journalArticleAcademicpeer-review

    36 Citations (Scopus)

    Abstract

    The long-term heat stabilisation efficiency of (natural) polyol additives in heavy metal- and zinc-free poly(vinyl chloride) (PVC) has been investigated. It is shown that polyols, such as sorbitol and xylitol, markedly reduce the dehydrochlorination rate and improve Congo Red values. Extraction experiments on unprocessed and ground-processed PVC-sorbitol (1.0 phr) mixtures after thermal degradation at 200 °C revealed that especially in the ground-processed PVC-sorbitol system, sorbitol is partly converted into its mono- and dianhydro-derivatives 1,4-sorbitan and isosorbide, respectively. Apparently, the HCl released during thermal degradation acts as the catalyst. Similar intramolecular cyclodehydration reactions also occur with the natural polyols, erythritol and xylitol, under these conditions. Scrutiny of the measured dehydrochlorination rates and the Congo Red values for ground-processed heavy metal- and zinc-free PVC¿polyol mixtures show that in particular polyols containing primary hydroxyl groups exert long-term heat stabilisation and that they act as efficient HCl scavengers
    Original languageEnglish
    Pages (from-to)52-59
    JournalPolymer Degradation and Stability
    Volume91
    Issue number1
    DOIs
    Publication statusPublished - 2006

    Keywords

    • acid-catalyzed dehydration
    • thermal dehydrochlorination
    • polyvinyl-chloride)
    • derivatives
    • costabilizers
    • conversion
    • stearates
    • synergism
    • hexitols

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