Methylene chloride permeation in polycarbonate using a 14C tracer

Thomas J. Stanley, William J. Ward, Montgomery Meigs Alger

Research output: Contribution to journalArticle

Abstract

The migration of small molecules from polymeric food packages into food can be predicted with mathematical models if the pertinent thermodynamic and transport parameters are known. These parameters can be measured using 14C-labeled solutes. For methylene chloride permeation through 0.5-mil polycarbonate films, steady state was reached in several hours. Adequate fluxes were realized with just 1-cm2 diffusion area. The diffusion coefficient of methylene chloride in polycarbonate is 3.3 × 10-11 cm2/s, and the solubility is 17 (cm3 (STP)/cm3)/cmHg, both measured at 25 °C. No concentration dependence was noted over the range of conditions explored (200-3000 ppm methylene chloride in polycarbonate). These results are in good agreement with the results obtained in an independent experiment using unlabeled methylene chloride which was sorbed into solute-free polycarbonate films from dilute aqueous solutions.

Original languageEnglish (US)
Pages (from-to)1494-1497
Number of pages4
JournalIndustrial and Engineering Chemistry Research
Volume28
Issue number10
StatePublished - Oct 1989

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

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