Impact of backbone composition on homopolymer dynamics and brush block copolymer self-assembly
| Autor: | Garret M. Miyake, Tara E. Mensch, Matthew D. Ryan, Joseph L. Collins, Bret M. Boyle, Brian S. Newell |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanostructure Polymers and Plastics Scanning electron microscope Organic Chemistry Bioengineering 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Article 0104 chemical sciences chemistry Chemical engineering Copolymer Side chain Lamellar structure Self-assembly 0210 nano-technology Photonic crystal |
| Zdroj: | Polym Chem |
| ISSN: | 1759-9962 1759-9954 |
| Popis: | Four series of brush block copolymers (BBCP), with near identical side chain compositions but varying backbone structures, were synthesized to investigate the effect of backbone structure on the process of thermal BBCP self-assembly to photonic crystals (PCs). Each of the self-assembled PC films were examined by reflection measurements, small angle X-ray scattering measurements, and scanning electron microscopy to compare the resulting properties of the polymeric photonic crystal and the nanostructured morphology impacted by the backbone structure. It was found that the composition of the brush backbone within a BBCP has a dramatic effect on the ability of the BBCP to self-assemble into ordered nanostructures and on the local ordering of the nanostructure morphology accessed with higher molecular weight (MW) BBCPs (> 1,500 kg/mol). BBCPs with a norbornene imide-based backbone were able to thermally self-assemble to longer wavelength reflecting PCs and had higher fidelity ordering of lamellar nanostructures with higher MW polymers. By analyzing the melt rheological responses of the backbone compositions, both as linear polymers and homobrush polymers, it was concluded that the inherent fragility of the backbone promotes enhanced local ordering in the lamellar nanostructure morphology as well as access to larger domain sizes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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