The mechanism of polymer alignment of liquid-crystal materials

DOI PDF 被引用文献123件
  • J. M. Geary
    AT&T Bell Laboratories, Murray Hill, New Jersey 07974
  • J. W. Goodby
    AT&T Bell Laboratories, Murray Hill, New Jersey 07974
  • A. R. Kmetz
    AT&T Bell Laboratories, Murray Hill, New Jersey 07974
  • J. S. Patel
    AT&T Bell Laboratories, Murray Hill, New Jersey 07974

書誌事項

公開日
1987-11-15
DOI
  • 10.1063/1.339124
公開者
AIP Publishing

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説明

<jats:p>Smetic and nematic liquid-crystal materials can be homogeneously aligned by buffed thin films of appropriate polymers. We propose that the buffing process orients the polymer’s molecular chains in a manner similar to cold drawing of bulk polymer samples. Experimental verification of this theory is obtained by measuring buffing-induced birefringence in thin films of various polymers coated on glass. Further experiments establish that the oriented state of the polymer chains, and not scratching or grooving of the surface, is necessary to produce alignment. Alignment is found to occur when the polymer is both oriented and crystalline. A picture of alignment is presented in which the formation of a liquid-crystal phase on the crystalline,oriented polymer surface is analogous to the epitaxial growth of conventional solid crystals.</jats:p>

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