Abstract
AbstractCrystalline poly(undecanal) (2) was prepared by anionic polymerization of undecanal (1) with lithium tert‐butanolate in methylcyclohexane. As the aliphatic side chain length of the monomeric aldehyde increases, the polymerization becomes increasingly difficult and 2 could only be obtained if the temperature profile during the polymerization was carefully controlled. 2 of reasonable molecular weight was obtained in nearly 50% yield and was identified by IR and NMR spectroscopy. X‐ray diffraction measurements showed the polymer to be highly crystalline. The paraffinic side chains of 2 were found to be primarily responsible for the polymer crystallization and the polymer side chain transitions were found between 40 and 60°C. Normally, more than one endothermic peak was found by DSC in this region. 2 could be extended through an orifice to a coherent filament whose x‐ray diffraction pattern showed negligible orientation. In contrast, other aldehyde polymers with shorter side chains gave good fiber patterns on extrusion.
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