Control of the primary and secondary structure of polymer brushes by surface-initiated living/controlled polymerization

Tomoyasu Hirai, Motoyasu Kobayashi, Atsushi Takahara

Research output: Contribution to journalReview article

7 Citations (Scopus)

Abstract

Characterization of the molecular structure of high-density well-defined polymer brushes with predictable number-average molecular weight (Mn), 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 × 105 g mol-1 maintaining a narrower MWD (Mw/Mn < 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.

Original languageEnglish
Pages (from-to)5456-5468
Number of pages13
JournalPolymer Chemistry
Volume8
Issue number36
DOIs
Publication statusPublished - Sep 28 2017

Fingerprint

Brushes
Polymerization
Polymers
Molecular Weight
Molecular weight
Trifluoroethanol
Fullerenes
Living polymerization
Anionic polymerization
Atom transfer radical polymerization
Polymethyl Methacrylate
Free radical polymerization
Molecular Structure
X-Ray Diffraction
Molecular structure
Monomers
X ray diffraction
Incidence

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biochemistry
  • Polymers and Plastics
  • Organic Chemistry

Cite this

Control of the primary and secondary structure of polymer brushes by surface-initiated living/controlled polymerization. / Hirai, Tomoyasu; Kobayashi, Motoyasu; Takahara, Atsushi.

In: Polymer Chemistry, Vol. 8, No. 36, 28.09.2017, p. 5456-5468.

Research output: Contribution to journalReview article

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