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Phase Transitions in Polymer Blends and Block Copolymers Induced by Selective Dilation with Supercritical CO2

  • J. J. Watkins
  • G. D. Brown
  • M. A. Pollard
  • V. S. Ramachandrarao
  • T. P. Russell
Chapter
Part of the NATO Science Series book series (NSSE, volume 366)

Abstract

Supercritical fluids (SCFs) offer a number of advantages for the synthesis and processing of polymeric materials. Early work in the field focused on the high-pressure polymerization of ethylene or exploited the adjustable physicochemical properties of SCFs, including density and dielectric constant, for the fractioeation, extraction and impregnation of polymers.1 Recently, the field has expanded to include polymer synthesis and modification by reactive processing in the presence of CO2. With few exceptions these are heterogeneous processes that are facilitated by enhanced transport within the SCF-swollen polymer and are sensitive to the partitioning of solutes between the fluid and polymer phases. Examples include heterogeneous dispersion polymerizations in CO2 2, condensation reactions in dilated melts3, and the preparation of composite materials by conducting chemical reactions directly within solid polymers swollen by CO2 4.

Keywords

Block Copolymer Supercritical Fluid Lower Critical Solution Temperature Diblock Copolymer Vinyl Methyl Ether 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2000

Authors and Affiliations

  • J. J. Watkins
    • 1
  • G. D. Brown
    • 1
  • M. A. Pollard
    • 2
  • V. S. Ramachandrarao
    • 1
  • T. P. Russell
    • 2
  1. 1.Departments of Chemical Engineering and Polymer Science and EngineeringUniversity of MassachusettsAmherstUSA
  2. 2.University of MassachusettsAmherstUSA

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