期刊
LANGMUIR
卷 34, 期 10, 页码 3283-3288出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b04167
关键词
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资金
- Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan
- World Premier International Research Center Initiative (WPI) MEXT, Japan
- Cooperative Research Program of Network Joint Research Center for Materials and Devices
- Impulsing Paradigm Change through Disruptive Technologies (ImPACT) Program
- Grants-in-Aid for Scientific Research [16J06889] Funding Source: KAKEN
It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation.
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