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Highly oriented and ordered microstructures in block copolymer films |
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| Authors: | Wei Zhao Yi Zhang Xiao Wang Xiaowen Hu Feng Liu Thomas P Russell Guofu Zhou |
| Institution: | 1. SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou Higher Education Mega Center, 510006, Guangzhou, China;2. Department of Physics and Astronomy, and Collaborative, Innovation Center of IFSA (CICIFSA), Shanghai Jiaotong University, Shanghai, 200240 People's Republic of China;3. Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts, 01003 USA
Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029 China Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720 USA;4. SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou Higher Education Mega Center, 510006, Guangzhou, China Shenzhen Guohua Optoelectronics Tech. Co. Ltd., No. 1301-1, Tourism Road, Dabu Xiang, Longhua District, 518110, Shenzhen, China Academy of Shenzhen Guohua Optoelectronics, No. 1301-1, Tourism Road, Dabu Xiang, Longhua District, Shenzhen, 518110, China |
| Abstract: | Block copolymer (BCP) films with long-range lateral ordering and orientation are crucial for many applications. Here, we report a simple, versatile strategy based on a solution casting procedure, to produce millimeter thick film of BCPs with highly oriented nanostructures. Transmission electron microscope (TEM), small angle X-ray scattering (SAXS), and Hansen solubility parameters were used to study the morphology and interactions of the system. A variety of BCP-solvent pairs were investigated. Factors including set-up geometry, BCP characteristics, solvent evaporation, surface tension, and interactions, such as solvent-BCP, solvent-substrate, and BCP-substrate were examined. A mechanism is proposed to describe the observed long-range lateral ordering and orientation in films up to 1 mm in thickness. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 1369–1375 |
| Keywords: | block copolymers film morphology long-range ordering nanostructure orientation solution cast |