Hiroshi Uyama

Highly porous N-doped activated carbon monoliths (ACMs) are fabricated by carbonization and physical activation of mesoporous polyacrylonitrile (PAN) monoliths in the presence of CO(2). The monoliths exhibit exceptionally high CO(2) uptake; 5.14 mmol g(-1) at ambient pressure and temperature and 11.51 mmol g(-1) at ambient pressure and 273 K.

Abstract Enzymatic ring-opening polymerization of lactones was achieved by using lipase as catalyst. The polymerization of ε-caprolactone by Pseudomonas fluorescens lipase at 60 °C in bulk for 10 days afforded a polyester with average molecular weight of 7.0 × 103. From 1H and 13C NMR analysis, the polymer possesses the terminal structure of a carboxylic acid group at one end and a hydroxyl group at the other.

Green nanocomposites based on renewable plant oils have been developed. Curing of epoxidized plant oils in the presence of organophilic montmorillonite produced triglyceride−clay nanocomposites showing flexible property. A nanocomposite with homogeneous structure was obtained, in which silicate layers of the clay were intercalated and randomly distributed in the polymer matrix.

Abstract Enzymatic ring-opening polymerization of macrolides was carried out by using various lipases as catalysts. The monomers used in this study were 11-undecanolide (12-membered, UDL) and 15-pentadecanolide (16-membered, PDL). Among the enzymes examined, lipases derived from Pseudomonas fluorescens (lipase P) and from Candida cylindracea (lipase B) gave polyUDL with high molecular weight in a high yield. From 1H and 13C NMR analysis, the polymer was found to possess the terminal structure of

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLipase-Catalyzed Ring-Opening Polymerization of 12-DodecanolideHiroshi Uyama, Kazuhiro Takeya, Norio Hoshi, and Shiro KobayashiCite this: Macromolecules 1995, 28, 21, 7046–7050Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs.acs.org/doi/10.1021/ma00125a002https://doi.org/10.1021/ma00125a002research-articleACS PublicationsRequest reuse permissionsArticle Views533Altmetric-

Abstract Poly(2-iso-propyl-2-oxazoline) (PiPrOZO), prepared by cationic ring-opening polymerization of iPrOZO, has been found to be a thermo-sensitive polymer. PiPrOZO possesses a cloud point (CP) around 36 °C. The CP changed by the addition of sodium chloride or a surfactant. For utilizing these characteristics, a new hydrogel was prepared by copolymerization of a PiPrOZO macromonomer with ethylene glycol dimethacrylate. The hydrogel swelled below the CP of PiPrOZO. Above the CP, on the other h

Mesoporous polyacrylonitrile (PAN) monolith has been fabricated by a template-free approach using the unique affinity of PAN towards a water/dimethyl sulfoxide (DMSO) mixture. A newly developed Thermally Induced Phase Separation Technique (TIPS) has been used to obtain the polymer monoliths and their microstructures have been controlled by optimizing the concentration and cooling temperature.

Epoxide-containing polyesters were enzymatically synthesized via two routes using unsaturated fatty acids as starting substrate. Lipase catalysis was used for both polycondensation and epoxidation of the unsaturated fatty acid group. One route was synthesis of aliphatic polyesters containing an unsaturated group in the side chain from divinyl sebacate, glycerol, and the unsaturated fatty acids, followed by an epoxidation of the unsaturated fatty acid moiety in the side chain of the resulting pol

Abstract Catechin was oxidatively polymerized by laccase in a mixture of a polar organic solvent and buffer to give a new class of flavonoid polymers. Myceliophthora laccase showed high catalytic activity for the polymerization. Using a mixed solvent of acetone and pH 5 acetate buffer efficiently produced the polymer. Under the selected conditions, DMF‐soluble polymers were obtained in good yields. Effects of reaction parameters on the yield, solubility, and molecular weight of the polymer have

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorChemoselective Polymerization of a Phenol Derivative Having a Methacryl Group by Peroxidase CatalystHiroshi Uyama, Chakapan Lohavisavapanich, Ryohei Ikeda, and Shiro KobayashiView Author Information Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-01, Japan, and Department of Materials Chemistry, Graduate School of Engineering, Tohoku University, Sendai 980-77, Japan C