Double liquid crystalline side-chain type block copolymers for hierarchically ordered nanostructures: Synthesis and morphologies in the bulk and thin film
| Autor: | Ryohei Kikuchi, Hiroaki Urushibata, Jun Kouki, Masa-aki Kakimoto, Teruaki Hayakawa, Rina Maeda, Masatoshi Tokita |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Nanostructure
Materials science Polymers and Plastics Small-angle X-ray scattering General Chemical Engineering Radical polymerization General Chemistry Biochemistry Living free-radical polymerization Chemical engineering Polymerization Polymer chemistry Materials Chemistry Copolymer Environmental Chemistry Lamellar structure Thin film |
| Zdroj: | Reactive & Functional Polymers. 69:519-529 |
| Popis: | Well-defined double liquid crystalline side-chain type block copolymers (DLC-BCPs) were synthesized by nitroxide-mediated living free radical polymerization (NMP) of two different types of styrene monomers containing liquid crystalline moieties. The molecular weights and compositions were controlled by changing the polymerization time and/or the feed amount of the monomers. The bulk morphologies were studied using wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). DLC-BCPs were favored to form microphase-separated lamellar structures over a wide range of volume fractions. By controlling the annealing conditions, further higher-ordered hierarchical nanostructures were obtained with a long-range alignment, in which the semi-crystalline side-chains were oriented parallel to the interface of microphase-separated lamellar structure. Thin film morphology was investigated using atomic force micrography (AFM). The formation of lamellar nanostructure with a long-range alignment vertically oriented to the silicon wafer substrate was achieved by simple thermal annealing. |
| Databáze: | OpenAIRE |
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