Dehydrochlorination of poly(vinyl chloride) with Ca(OH) 2 in ethylene glycol and the effect of ball milling

Tomohito Kameda, Shintaro Wachi, Guido Grause, Tadaaki Mizoguchi, Toshiaki Yoshioka

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18 Citations (Scopus)


The dehydrochlorination behavior of pure and flexible PVC in ethylene glycol was studied in the presence of Ca(OH) 2 at temperatures between 170 °C and 190 °C. Although the dehydrochlorination proceeded slower in Ca(OH) 2 than in NaOH, similar dehydrochlorination yields were obtained. It was assumed that the slower reaction rate was a result of the low solubility of Ca(OH) 2 and the larger solvation shell of the Ca 2+ ion. The dehydrochlorination rate and yield were improved by employing a ball mill. Additionally, diisononyl phthalate and CaCO 3 were quantitatively separated from flexible PVC during the ball-milling process. The maximum dehydrochlorination yield of pure PVC after 7 h at 190 °C was 74%. After 8 h at the same temperature, a comparable dehydrochlorination yield of 77% was achieved for flexible PVC, which could be increased by ball milling to 86%.

Original languageEnglish
Pages (from-to)1687-1691
Number of pages5
JournalJournal of Polymer Research
Issue number6
Publication statusPublished - 2011 Nov


  • Ca(OH)
  • Dehydrochlorination
  • Ethylene glycol
  • Poly(vinyl chloride)
  • Reaction kinetics


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