Abstract
Porous anodic aluminum oxide (AAO) templates with 20, 35, and 60 nm cylindrical pores were prepared and subsequently infiltrated with poly(ethylene oxide), PEO, polyethylene, PE, and polyethylene-block-polystyrene diblock copolymers, PE-b-PS, of various compositions. The crystallization of the nanocylinders within the AAO templates was studied by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). A clear change from heterogeneous to homogeneous bulk nucleation was detected in the PEO before and after infiltration within a 20 nm template, respectively. The homogeneously nucleated nanocylinders needed extreme supercooling in order to crystallize, and their low crystallization temperature was successfully correlated with the volume of the crystallizing phase. 2D-WAXD measurements demonstrated that the PEO chains within the crystals formed inside the nanocylinders, preferentially orient perpendicular to the cylinder axis. This chain orientation is probably due to the easier cryst...
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