We have prepared a homologous series of polymers, BP-CO4-On (n= 3-15).
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The BP-CO4-On polymers are classified as a new type of main-chain liquid crystalline polymer, characterized by having the mesogenic biphenyl moieties and the two different aliphatic spacers incorporated in a regularly alternate fashion. All the polymers form a smectic A phase. The smectic behaviour and structure have been examined by differential scanning, optical microscopic and x-ray methods, concentrating on how the two spacers, which are different in length and of odd-even nature, are accommodated into a smectic layer structure.
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