PTFE Drawn Films for Alignment Layers

Wittmann and Smith [15] reported that thin PTFE layer deposition is achieved by rubbing a bar of PTFE on a smooth siuTace and that this induces a well oriented chain axis of PTFE macromolecules. (See Fig. 3.6.1) 

The chain axes align parallel to the substrate smface and along the sliding direction. The PTFE alignment was confirmed by electron diffraction studies, showing that the orientation and crystalline perfection of the layer were high. It 

Molecular structures of PI LB films UV dichroic ratio IR dichroic ratio TN liquid crystal ceil  

7 Liquid Crystalline Alignment on Chemically Treated Surfaces 

Surface active agents are often used in industry to form homogeneous polymer layers or to increase adhesion for paints and adhesives. In the case of liquid crystalline materials, surface active agents like silicone compounds are used to obtain homeotropic alignment. 

1 Addition of surface active agents into liquid crystalline materials 

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Surfaces-PTFE Drawn Films for Alignment Layers... 

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