Abstract
The structure and dynamics of structure formation have been studied in model triarm star block copolymers composed of two crystallizable blocks (poly(ethylene oxide) (PEO) and poly(e-caprolactone) (PCL)) and one amorphous block (polystyrene (PS)). Crystallization starts from the homogeneous phase. For the structure investigation, X-ray scattering, optical microscopy, and atomic force microscopy have been employed, whereas for the kinetics, we have used differential scanning calorimetry, optical microscopy, and rheology. In the stars, there is a competition for crystallization between the two crystallizable blocks which have similar mobilities and melting temperatures but crystallize in different unit cells (monoclinic vs orthorhombic). When the crystallizable block length ratio is 3 or higher, only the longer block will crystallize. For comparable lengths both blocks can crystallizehowever, not within the same moleculebut the crystallinity, long period, and crystalline lamellar thickness are reduced with ...
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