Synthesis of high molecular weight polycarbonate by solid-state polymerization

Stephen M. Gross, George W. Roberts, Douglas J. Kiserow, Joseph M. DeSimone

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


The solid-state polymerization (SSP) of small particles (20 pm) of poly(bisphenol A carbonate) resulted in high molecular weight material (Mw of 36 000 g/mol). Molecular weight distribution broadening was not observed in polycarbonate in the form of small granulated powders but did occur in large polycarbonate beads (3.6 mm diameter). We hypothesize that this broadening is due to slow diffusion of phenol inside the larger polymer particles. A systematic investigation of the role of CO2 pressure and temperature was performed. It was found that the increase in molecular weight was a strong function of CO2 pressure and temperature. Additionally, the chain extension reactions occurred faster at higher supercritical CO2 flow rates. The SSP of polycarbonate in the presence of supercritical CO2 can be accomplished at temperatures as low as 90 °C, which is 60 °C lower than the Tg of polycarbonate at normal conditions. This should suppress the side reactions that lead to color body formation, thereby resulting in a product with good optical clarity and color.

Original languageEnglish (US)
Pages (from-to)3916-3920
Number of pages5
Issue number12
StatePublished - Jun 5 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


Dive into the research topics of 'Synthesis of high molecular weight polycarbonate by solid-state polymerization'. Together they form a unique fingerprint.

Cite this