Creation of new supramolecules based on multi-stranded polymer chains

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We previously found that the stereocomplex formed from stereoregular poly (methyl methacrylate)s (PMMA) are a supramolecule composed of a multi-stranded helix of the polymer chains by direct observation with high-resolution atomic force microscopy. The multi-stranded helix can be a building block of new polymeric supramolecular structures. In this study, we synthesized stereoblock copolymers composed of uniform isotactic and syndiotactic PMMAs, and the resultant stereocomplexes were evaluated by AFM and the effect of the primary structures on the stereocomplexes was discussed. Stereocomplex of poly (lactic acid), which is not a multistranded helix but alternative packing of chiral PLAs, was also studied. The molecular image of the PLA stereocomplex was successfully observed by AFM and the mechanism of stereocomplex formation of PLAs was discussed.