Gyroid Structures at Highly Asymmetric Volume Fractions by Blending of ABC Triblock Terpolymer and AB Diblock Copolymer
| Autor: | Chungryong Choi, Jongheon Kwak, Yeseong Seo, Seonghyeon Ahn, Jin Kon Kim, Byeongdu Lee |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Morphology (linguistics)
Materials science Polymers and Plastics Scattering Organic Chemistry Shell (structure) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography Tetragonal crystal system Volume (thermodynamics) Transmission electron microscopy Polymer chemistry Materials Chemistry Copolymer 0210 nano-technology Gyroid |
| Zdroj: | Macromolecules. 50:9008-9014 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b01734 |
| Popis: | We investigated, via small-angle X-ray scattering and transmission electron microscopy, the morphologies of binary blend of polyisoprene-b-polystyrene-b-poly(2-vinylpyridine) (ISP) triblock terpolymer and polyisoprene-b-polystyrene (IS) diblock copolymer. An asymmetric ISP with volume fractions (f) of 0.12, 0.75, and 0.13 for PI, PS, and P2VP blocks, respectively, showed a new morphology: coexistence of spheres and cylinders with tetragonal packing. Asymmetric IS with fI = 0.11 and fS = 0.89 showed conventional body-centered cubic spherical microdomains. Very interestingly, a binary blend of ISP and IS with overall volume fractions of fI = 0.12, fS = 0.79, and fP = 0.09 exhibited core–shell double gyroid (CSG: Q230 space group), where PI consists of thin core and PS forms thick shell, while P2VP becomes thin matrix. It is very unusual to form CSG even at highly asymmetric volume fractions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|