Ferrocenic liquid crystal polymer
New liquid crystalline polymers have been prepared, containing in the main chain stiff ferrocene units linked by flexible aliphatic spacers. Bifunctional ferrocene derivatives, viz., 1,1'-carboxyl, l,l'-hydroxyalkyl or 1,1'-hydroxybenzoylethynyl, were used to prepare the stiff segments. Ethylene glycol or sebacic chloride was used to prepare the linking soft segments. Polymers were prepared either by interfacial polycondensation or by polycondensation in a pyridine solution. All these polymers were relatively low in molecular weight, oligo rather than poly (cf Table 1). They exhibited liquid crystalline properties as confirmed by the DSC method and demonstrated by a hot-stage polarizing microscope. The polymers carrying the benzoylethynyl groups on the ferrocene ring exhibited higher mesophase transition temperatures and a better thermal resistance.
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