Journal
POLYMER CHEMISTRY
Volume 8, Issue 36, Pages 5456-5468Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7py00956a
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Funding
- 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
- High Energy Accelerator Research Organization (KEK) [2008S]
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Characterization of the molecular structure of high-density well-defined polymer brushes with predictable number-average molecular weight (M-n), narrow molecular weight dispersity (MWD), and highly ordered tacticity, prepared by surface-initiated controlled radical polymerization or living anionic polymerization, is described. Ionic monomers, such as 3-(N-2-methacryloyloxyethyl-N,N-dimethyl) ammonatopropanesulfonate (MAPS), were polymerized by atom transfer radical polymerization in 2,2,2-trifluoroethanol in the presence of imidazolium chloride to give a polymer with Mn greater than 2 x 10(5) g mol(-1) maintaining a narrower MWD (M-w/M-n < 1.2). Neutron reflectivity measurement of poly(MAPS) (PMAPS) brushes at the water interface revealed that polymer brushes with narrow MWD form a relatively sharp boundary at the solution interface, while brushes with a broad MWD show a gradient solution interface due to the variety of chain length. The effect of MWD on swollen chain structure is described. This article also reviews surface-initiated stereospecific polymerization. High density poly(methyl methacrylate) (PMMA) brushes with well-controlled primary structures were prepared on flat and spherical substrates using surface-initiated living anionic polymerization in the presence of triethyl aluminum. The PMMA brushes so obtained showed highly controlled stereoregularity (rr > 88%). Grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements indicated that the stereoregular PMMA brushes formed helical structures with about 1 nm diameter and encapsulated fullerenes in the cavities.
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