Dechlorination of poly(vinylidene chloride) in NaOH/ethylene glycol as a function of NaOH concentration, temperature, and solvent

Toshiaki Yoshioka, Tomohito Kameda, Shogo Imai, Masahiko Noritsune, Akitsugu Okuwaki

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16 Citations (Scopus)

Abstract

The wet dechlorination treatment of poly(vinylidene chloride) (PVDC) was evaluated at atmospheric pressure in a solution of NaOH in ethylene glycol (EG), as a function of NaOH concentration, temperature, and solvent. Hydroxide ion from NaOH was required for dechlorination with EG acting solely as a solvent. The wet treatment exhibited significantly enhanced dechlorination efficiency over traditional thermal techniques, with a reaction efficiency as high as 92.8% in 1.0 M NaOH at 190 °C. Dechlorination reactions of PVDC in both NaOH/EG and NaOH/H2O were expressed by an apparent first-order reaction. At 190 °C, the apparent rate constant in 1.0 M NaOH/EG was approximately 1.4 times larger than in 1.0 M NaOH/H2O, with an apparent activation energy of 82.8 kJ mol-1, indicating that the reaction proceeded under chemical control. The degree of dechlorination increased with increasing reaction temperature, favouring the elimination of HCl over the hydroxyl substitution of chloride.

Original languageEnglish
Pages (from-to)1979-1984
Number of pages6
JournalPolymer Degradation and Stability
Volume93
Issue number10
DOIs
Publication statusPublished - 2008 Oct

Keywords

  • Apparent activation energy
  • Apparent rate constant
  • Dechlorination
  • NaOH/EG solution
  • Poly(vinylidene chloride)

ASJC Scopus subject areas

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

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