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We report a ring expansion vinyl polymerization producing cyclic polymers using a tetra(oxyethylene) (TOE)-tethered cyclic initiator for the nitroxide-mediated controlled radical polymerization (NMP). Styrene (St) was polymerized with the cyclic NMP initiator 1 in the bulk to produce polymer 2. Structural analyses of 2 were performed by a size exclusion chromatograph equipped with a multiangle laser...
For practical applications of poly(l-lactic acid) (PLLA), PLLA crystallization with keeping transparency is preferable. As one method to keep transparency without inhibiting crystallization, we prepared SiO2 nanoparticles which were modified with poly (methyl methacrylate) (PMMA-g-SiO2). FT-IR and TG–DTA measurement indicated that PMMA was grafted on SiO2 surface successfully. TG–DTA and GPC measurement...
The chain stiffness and local chain conformation of atactic poly(α-methylene-γ-butyrolactone) (PMBL), which is a side chain cyclic structural analog of poly(methyl methacrylate) (PMMA), with a weight-average molecular weight (Mw) ranging from 2.8 × 103 to 2.6 × 106 in N,N-dimethylformamide (DMF) and γ-butyrolactone (GBL) were characterized by size exclusion chromatography with a multi-angle light-scattering...
Complexes that were insoluble in water were formed by mixing aqueous solutions of a block copolymer of 2-ethtyl-2-oxazoline (EOX) and ethylene oxide (EO) and those of poly(methacrylic acid) (PMAA). The structures of these complexes were investigated by the results obtained mainly by infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry. The molar ratio of MAA in the complexes...
Complexes were formed by mixing aqueous solutions of poly(2-ethyl-2-oxazoline) (PEOX) and poly(methacrylic acid) (PMAA) with a wide range of concentrations and were characterized with infrared and X-ray photoelectron spectroscopy, light scattering and intrinsic viscosity measurements. The infrared and X-ray photoelectron spectra indicated that PEOX and PMAA formed complexes by hydrogen bonds between...
Hydrophilic polymers show unique characteristics at various interfaces. High-density hydrophilic polymer brushes nano-coatings were prepared on Si-wafer and various substrates by surface-initiated controlled radical polymerization. Chain conformation at liquid/solid liquid/solid interface was characterized by neutron reflectivity. Applications of polymer brushes as structural nano-coatings such as...
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