We report for the first time the conformational and structural details of peptide-mimic poly(n-hexyl isocyanate) (PHIC). PHIC is a representative poly(n-alkyl isocyanate)s, which have received significant attention because of their unique stiff chain characteristics and potential applications in various fields. A well-ordered hexagonal close packing structure of PHIC with 8 3 helical conformation was clearly observed in the nanoscale thin films that were selectively annealed with carbon disulfide (CS2). A well-ordered multi-bilayer structure of the polymer with β-sheet conformation was also clearly formed in the films that were selectively annealed with toluene. In addition, a fully reversible transformation between these two self-assembled structures was demonstrated by consecutive annealings with CS2 and toluene.
Bibliographical noteFunding Information:
This study was supported by the National Research Foundation of Korea (Doyak project (2011-0028678) and the Center for Electro-Photo Behaviors in Advanced Molecular Systems (2010-0001784)), the Program for Integrated Molecular System of GIST and the Ministry of Education, Science and Technology (MEST) (BK21 Program and World Class University Program R31-2008-000-10059-0 and R31-20008-000-10026-0). The synchrotron X-ray scattering measurements at the Pohang Accelerator Laboratory were supported by MEST and POSCO Company, and POSTECH Foundation.
- Conformation change
- Hexagonal close packing structure
- Multi-bilayer structure
- Peptide-mimic poly(n-alkyl isocyanate)
- Reversible order-order transition
- Selective solvent annealing