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Liquid crystalline polymers

Liquid crystalline polymers. i.e. no liquid crystallinity in melt ( thermotropic liquid crystal) but typically rodlike polymers form liquid crystalline phases in solution ( lyotropic liquid crystal) (typical solvents are strong acids).

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Liquid crystalline polymers

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  1. Liquid crystalline polymers

  2. i.e. no liquid crystallinity in melt (thermotropic liquid crystal) but typically rodlike polymers form liquid crystalline phases in solution (lyotropic liquid crystal) (typical solvents are strong acids) Example: ”Kevlar” poly(p-phenylene terephthalamide) forms lyotropic liquid crystalline phase in sulphuric acid

  3. In order to achive liquid crystallinity in melt (thermotropic) add some flexibility

  4. Nematic, Smectic, and Cholesteric

  5. Discotic phases

  6. Effect of spacer lenght

  7. Summary: thermotropic and lyotropic liquid crystals

  8. Viscosity

  9. Polymer liquid-crystallinity theory … Flory’s lattice model …

  10. Defects in liquid crystals

  11. Defects in liquid crystals

  12. Defects in liquid crystals

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