Double liquid crystalline side-chain type block copolymers for hierarchically ordered nanostructures: Synthesis and morphologies in the bulk and thin film |
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| Authors: | Rina Maeda Teruaki Hayakawa Masatoshi Tokita Ryohei Kikuchi Jun Kouki Masa-aki Kakimoto Hiroaki Urushibata |
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| Affiliation: | 1. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26 Ookayama, Meguro-ku, Tokyo 152-8552, Japan;2. Center for Advanced Materials Analysis, Tokyo Institute of Technology, 2-12-1-S7-26 Ookayama, Meguro-ku, Tokyo 152-8552, Japan;3. Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1-S3-22 Ookayama, Meguro-ku, Tokyo 152-8552, Japan |
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| Abstract: | 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. |
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