Abstract
Individual homologues of oligo(oxymethylene) diacetates, CH3CO2(CH2O)nCOCH3, from the octamer to the hexadecamer (8≤n≤16) were isolated from a reaction mixture of paraformaldehyde and acetic anhydride by means of preparative supercritical fluid chromatography (SFC). Each oligo(oxymethylene) diacetate showed a sharp endotherm due to melting, and no other phase transition above −100°C. Plate crystals were obtained from ethanol solution of the decamer; X-ray crystallographic analysis showed that the crystal is orthorhombic and belongs to the space group P212121. The decamer chain assumes the structure of a 2/1 helix with one-handed screw sense. The packing of the molecules in a unit-cell is of the herringbone type, and the sublattice structure is similar to that of the orthorhombic modification of poly(oxymethylene). The nonamer crystallizes in the monoclinic system of space group Cc, and the helix pitch of the acetal backbone lies between 9/5 and 2/1. The molecular axis of the nonamer inclines slightly with the lamellar normal (a-axis).
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Ute, K., Takahashi, T., Matsui, Ki. et al. X-Ray Single Crystal Analysis of Oligo(oxymethylene) Diacetates. Polym J 25, 1275–1281 (1993). https://doi.org/10.1295/polymj.25.1275
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DOI: https://doi.org/10.1295/polymj.25.1275