Abstract
The morphology of the crystal structure of nascent polyoxymethylene (POM) obtained by cationic polymerization of trioxane in nitrobenzene was investigated by optical and electron microscopy. It was found that the morphology depends on temperature and conversion of polymerization at constant initial monomeric concentration (1.5 mol/l). Morphological changes were observed near the equilibrium concentration of trioxane in nitrobenzene (1.5 mol/l, 35°C). At lower temperatures (10–30°C), thin lamellar crystallites, organized in spherulites, are formed by successive polymerization and crystallization. At higher temperatures (40–90°C), thick crystallites organized in oval structures are formed by simultaneous polymerization and crystallization. Peculiarities of crystal formation of POM, obtained by simultaneous and successive polymerization and crystallization, are discussed.
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