Crystallization Induced Self-Assembly: A Strategy to Achieve Ultra-Small Domain Sizes
| Autor: | Ming-Sheng Ji, Zi-Hao Guo, Xiao-Yun Yan, Yuchu Liu, Qing-Yun Guo, Kan Yue, Yan-Jun Wu |
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| Rok vydání: | 2021 |
| Předmět: |
010405 organic chemistry
Small-angle X-ray scattering Chemistry Organic Chemistry General Chemistry 010402 general chemistry 01 natural sciences Catalysis Silsesquioxane 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering Polymerization law Phase (matter) Copolymer Lamellar structure Self-assembly Crystallization |
| Zdroj: | Chemistry (Weinheim an der Bergstrasse, Germany). 27(30) |
| ISSN: | 1521-3765 |
| Popis: | Achieving self-assembled nanostructures with ultra-small feature sizes (e. g., below 5 nm) is an important prerequisite for the development of block copolymer lithography. In this work, the preparation and self-assembly of a series of giant molecules composed of vinyl polyhedral oligomeric silsesquioxane (VPOSS) tethered with monodispersed oligo(L-lactide) chains are presented. Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) results demonstrate that ultra-small domain sizes (down to 3 nm) of phase separated lamellar morphology are achieved in bulk, driven by the strong tendency and fast kinetics for crystallization of VPOSS moieties. Moreover, upon gamma ray radiation, VPOSS cages in the lamellar structure can be crosslinked via polymerization of the vinyl groups. After pyrolysis at high temperature, ultra-thin two-dimensional nano-silica sheets can be obtained. |
| Databáze: | OpenAIRE |
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