Polymerization Of A Novel Liquid Crystalline Diacetylene Monomer

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Abstract
The polymerization of a liquid crystalline diacetylene monomer, 116 bis-[N-4-oxybenzylidene 4'-n-octylaniline) 2,4-hexadiyne, 1-0BOA, is reported both within the crystal and liquid crystal phases. The mono-mer exhibits smectic phase polymorphism at temperatures below the clearing temperature as shown by small angle X-ray scattering and optical microscopy. Polymerization kinetic results show first-order disappearance of monomer as seen by differential scanning calorimetr with a thermal activation energy of 31 kcal/mol. in the liquid crystal phase and ca. 71 kcal/mol. in the crystal phase. Poly(1-0BOA) exhibits a "soft" lamellar-like layer structure reminiscent of the monomer when polymerized within a low temerature liquid crystal phase. Consequently, the topochemicalpolymerization of diacetylene monomers within a liquid crystal phase top give ordered polymer structures is reported for the first time.

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