Abstract
The crystallization behavior of strongly segregated diblock copolymers composed of polyethylene (PE) and poly(l-lactide) or racemic poly(lactide) (PLA) blocks has been investigated by differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and transmission electron microscopy (TEM). In both systems the crystallization of PE block was confined within the preexisting lamellar domain. In the double-crystalline PLLA-b-PE, coincident crystallization of PLLA and PE blocks was observed during cooling process because the crystallization rate of the PLLA block was retarded by the covalent linkage with the PE block. When the PLLA block was self-nucleated, a complete separation of the crystallization process of both blocks was achieved. Polarized optical microscopy confirmed that neither PLLA nor PE blocks could form spherulites in view of the large segregation strength that effectively confined the crystallization within the lamellar microdomains. High-speed...
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