Crystallization and melting of copolymers of polyoxymethylene

Abstract

Copolymers of polyoxymethylene were prepared from trioxane in the presence of comonomers such as dioxolane, 1,3‐dioxane, dioxepane and epichlorohydrin, boron trifluoride etherate being used as catalyst. Fusion and crystallization phenomena were studied on these copolymers by use of density measurement, differential thermal analysis, dilatometry, and microscopy. The spherulite growth rate and the induction periode of the crystallization were determined. The temperature dependence of the growth rate was calculated assuming a two‐dimensional surface nucleation mechanism.