Production of Microcellular Polycarbonate Using Carbon Dioxide for Bubble Nucleation

[+] Author and Article Information
V. Kumar, J. Weller

Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195

J. Eng. Ind 116(4), 413-420 (Nov 01, 1994) (8 pages) doi:10.1115/1.2902122 History: Received November 01, 1992; Revised June 01, 1993; Online April 08, 2008


A process to produce a family of novel materials from polycarbonate, having a microcellular structure, is described. The process utilizes the high solubility of carbon dioxide in polycarbonate to nucleate a very large number of bubbles, on the order of 1 to 10 × 109 bubbles/cm3 , at temperatures well below the glass transition temperature of the original, unsaturated polycarbonate. Microcellular polycarbonate foams with homogeneous microstructure and a wide range of densities have been produced. In this paper experimental results on solubility, bubble nucleation, and bubble growth in the polycarbonate-carbon dioxide system are presented, and the critical ranges of the key process parameters are established. It is shown that the bubble nucleation phenomenon in polycarbonate near the glass transition temperature is not described by classical nucleation theory.

Copyright © 1994 by The American Society of Mechanical Engineers
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