Abstract
AbstractEpitaxial crystallization of polyoxymethylene (POM) from 0.5% iodobenzene solution has been attempted between 150 and 165°C on 11 different substrates having surface energies ranging from 136 to 1240 ergs/cm2. Included in this series are several substrates such as CaF2, SrF2, BaF2, graphite, mica, and silicon which had not been previously tested as substrates for POM epitaxy. The fluorite series materials are not good substrates for the epitaxial crystallization of POM from solution. In contrast, both rodlike and fold‐plane epitaxial morphologies have been found on the (001) surfaces of NaCl, NaF, and mica. A possible mechanism for the formation of fold‐plane epitaxy is discussed which involves solution nucleation followed by adsorption and growth of the nuclei on the substrate. It is suggested that variations observed in nucleation density of rodlike epitaxial crystals from substrate to substrate are a result of differences in degree of preferential solvent adsorption. Substrates having higher surface energies should tend to adsorb solvent more strongly and thus inhibit profuse nucleation of polymer crystals on the surface.
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