Add time:07/23/2019 Source:sciencedirect.com
The morphology of poly(3,3′diethyloxetane) fractions crystallized from the melt has been analyzed by polarized light microscopy and small angle light scattering. The superstructures that can be developed have been studied for a wide range of isothermal and non-isothermal crystallization conditions and molecular weights. The crystallization of the polymer in two different crystalline modifications (monoclinic and orthorhombic, depending on the temperature) has also been considered in relation with the morphology. Spherulites have been observed for fractions ranging in molecular weight from 10,000 to 800,000 for all crystallization conditions. Only for the lowest molecular weight and lowest undercoolings, other forms have been found. In the crystallization region in which the crystalline modifications co-exist, spherulites have been observed to deteriorate.
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