Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

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13 Citations (Scopus)

Abstract

The recycling of poly(vinyl chloride) (PVC) is one of the most important issues in the treatment of waste plastics. To improve PVC recycling, it is necessary to develop new recycling techniques, including new techniques for the dechlorination of chlorine-containing polymers. It has been established that wet dechlorination of PVC in NaOH/ethylene glycol solution is more effective than dry dechlorination. In this study, the wet process was used, and the chemical modification of PVC by nucleophilic substitution was considered for upgrading waste PVC. Chlorine was substituted in solution by several nucleophilic reagents, thus changing the properties of PVC. The reaction of PVC in Na2S/ethylene glycol solution at 170°C resulted in the formation of a mixture comprising 32% elimination and 26% substitution products. The scanning electron microscopy/energy dispersive X-ray spectroscopy mappings and elementary analysis of PVC indicated that this chlorine-substitution process led to cross-linking by sulfur.

Original languageEnglish
Pages (from-to)264-270
Number of pages7
JournalJournal of Material Cycles and Waste Management
Volume12
Issue number3
DOIs
Publication statusPublished - 2010

Keywords

  • Cross-linking
  • Dechlorination
  • Poly(vinyl chloride)
  • Substitution reaction
  • Sulfur-containing dianion

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Mechanics of Materials

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