Ordered nanoporous polymers from polystyrene-polylactide block copolymers.

摘要: Nanoporous polystyrene monoliths were prepared from polystyrene−polylactide (PS−PLA) block copolymers that form hexagonally packed nanocylinders of PLA in a PS matrix. A morphology diagram was developed to determine the range composition and molecular weight over which this existed. Macroscopic alignment these materials gave anisotropic subjected mild degradation conditions leading chemical etching PLA. The resulting nanoporous consisted matrix containing close-packed, oriented, continuous nanoscopic channels (pore size tunable through synthesis or blending) lined with chemically accessible hydroxyl functional groups. Both precursors porous analyzed moleculary (size-exclusion chromatography proton nuclear magnetic resonance spectroscopy) structurally (small-angle X-ray scattering, scanning electron microscopy, differential calorimetry). In addition, surfa...