Improved Mechanical Properties of Polymer Films Dried from the Swollen State in Uniaxial and Biaxial States of Strain

  • J. E. Mark

Abstract

The technique employed in the investigations reported in this review emphasizes postponing the formation of anisotropic domains in semi-flexible polymers so as to better orient them along a common director. Most of the materials investigated were prepared by the following sequence of steps:
  1. (i)

    Identifying polymer chains of sufficient stiffness to give liquid-crystalline, anisotropic phases (either homopolymers, or block copolymers consisting of stiff and flexible sequences)

     
  2. (ii)

    Cross linking the chains, in the presence of solvent, thus conferring sufficient solidity for the polymer to remain in a deformed state for any length of time, with the solvent preventing the premature ordering of the stiff chains or sequences

     
  3. (iii)

    Deforming the swollen network uniaxially or biaxially to induce segmental orientation

     
  4. (iv)

    Removing the solvent, at constant length or at constant force, in the hope of causing a first-order transition to a single-phase, homogeneous, and highly-ordered material.1–15

     

Keywords

Orientation Technique Swell State Cellulose Ether Kuhn Segment Extension Ratio 
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 New York 1995

Authors and Affiliations

  • J. E. Mark
    • 1
  1. 1.Department of Chemistry and the Polymer Research CenterThe University of CincinnatiCincinnatiUSA

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