Inversion of crystallization rates in miscible block copolymers of poly(lactide)-block-poly(2-isopropyl-2-oxazoline)

摘要: Miscible block copolymers (BCPs) are rarely studied. When one or both components of such BCPs semi-crystalline polymers, strong effects on the crystallization behavior can be expected. We present a study 18 miscible comprised poly(lactide) (PLLA, and PDLLA, amorphous) poly(2-isopropyl-2-oxazoline) (PiPOx, semi-crystalline) with PiPOx volume fractions 0.14 < ϕPiPOx 0.82. All exhibit single glass transition form homogeneous melt. Mixing has plasticizing effect increases its rates (DSC). In contrast, PLLA dramatically reduced, in most cases entirely prevented. During isothermal at 130 °C, were inverted comparison those parent homopolymers. Crystallization drives to phase separate formed crystalline structure is that The fast confines observed superstructure. studied multiple length scales – from atomic level (WAXS, IR spectroscopy) meso (AFM, SAXS) macroscopic superstructure (polarized optical microscopy). A mechanism evolution presented.