Superconducting hollow and solid fibers and thin films of YBa2Cu3OX from a polymeric precursor

Liquid crystal polymers from swallow-tailed mesogens

Abstract Swallow-tailed compounds containing an acetylenic unit have been synthesized. Only those compounds with a three ring structure exhibited liquid-crystalline phases. The platinum catalysed addition of these monomers to compounds containing Si-H groups was used to synthesize polymeric materials. Only those polymers with the tetramethyldisiloxane unit showed mesophases. The synthesis, characterization, and phase behaviour are described.