Effects of pressure on the degradation of poly(vinyl chloride)

T. Kamo*, Y. Kodera, Y. Sato, S. Kushiyama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Poly(vinyl chloride) was decomposed for 0-90 min at 300-440°C under 0-6.0 MPa of nitrogen pressure. Hydrogen chloride, liquid products, and residue were the main decomposition products. The yield of liquid products decreased with increasing reaction pressure, whereas the yield of residue increased, reaching maxima at 9.8 MPa (400°C) and 22.4 MPa (440°C). The pressure dependences of the product distribution and atomic ratio of hydrogen to carbon (H/C) imply that some of the liquid products were polycondensed with the dehydrochlorinated PVC and were retained in the residue under high-pressure. At atmospheric pressure, benzene was the predominant product. The yield of benzene decreased sharply with pressure, whereas the yield of linear paraffins increased significantly. The liquid product distribution suggests that polyene chains in the dehydrochlorinated PVC were converted to benzene and alkylbenzene under atmospheric pressure. However, some of the polyene chains underwent hydrogenation to form linear paraffins under high pressure.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalPolymer Degradation and Stability
Volume84
Issue number1
DOIs
Publication statusPublished - 2004 Apr
Externally publishedYes

Keywords

  • Paraffin
  • Pressure dependence
  • PVC
  • Reaction mechanism

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

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