A5027625884- biodegradable polymer synthesis and properties
- Advanced Polymer Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Synthetic Organic Chemistry Methods
- Chemical Synthesis and Reactions
- Hydrogels: synthesis, properties, applications
- Organometallic Complex Synthesis and Catalysis
- Polyoxometalates: Synthesis and Applications
- Fuel Cells and Related Materials
- Asymmetric Hydrogenation and Catalysis
- Surfactants and Colloidal Systems
- Ionic liquids properties and applications
- Conducting polymers and applications
- Catalysis for Biomass Conversion
- Synthesis and Properties of Aromatic Compounds
- Analytical Chemistry and Sensors
- Sulfur-Based Synthesis Techniques
- Spectroscopy and Chemometric Analyses
- Metabolomics and Mass Spectrometry Studies
- Photopolymerization techniques and applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Polymer Nanocomposite Synthesis and Irradiation
- NMR spectroscopy and applications
- Polymer crystallization and properties
- Phase Equilibria and Thermodynamics
Tokushima University
2015-2024
Institute of Engineering Science
2014-2015
Nagoya Institute of Technology
2008-2012
Abstract We examined ring‐opening polymerizations (ROPs) of ε‐caprolactone in toluene at 25–50 °C catalyzed by perfluoroalkanesulfonates and perfluoroalkanesulfonimides as organic catalysts. The ROPs proceeded quickly using these super Brönsted acids synthesized poly(ε‐caprolactone)s ( M n = 4.8 × 10 3 –13.5 ) with low polydispersity w / 1.10–1.48). These strong living ε‐caprolactone. After polymerization, Nf 2 NH was recovered reused. To survey solvents, CHCl tetrahydrofuran (THF) were used...
We examined ring-opening polymerizations (ROPs) of ε-caprolactone in toluene at 25−60 °C catalyzed by scandium perfluoroalkanesulfonates and perfluoroalkanesulfonimides. Using these catalysts, which have strong electron-withdrawing ligands, the ROPs proceeded quickly. Under identical conditions, were completed more rapidly for reactions trifluoromethanesulfonimide [Sc(NTf2)3] nonafluorobutanesulfonimide [Sc(NNf2)3] than those trifluoromethanesulfonate [Sc(OTf)3]. It was possible to...
Alkali metal cations, including the Li<sup>+</sup>cation, have been proposed to play a dual role in radical polymerization of<italic>N</italic>,<italic>N</italic>-dimethylacrylamide.
The physical properties of poly(lactic acid) (PLA) are influenced by its stereoregularity and stereosequence distribution, polymer stereochemistry can be effectively studied NMR spectroscopy. In previously published studies PLA tacticity, the data were fitted to pair-addition Bernoullian models. this work, we prepared several samples with a tin catalyst at different L,L-lactide D,D-lactide ratios. Upon analysis tetrad intensities model, found substantial deviations between observed...
In this article, we described the ring-opening polymerization (ROP) of ϵ-caprolactone using a polymer-supported scandium(III) trifluoromethanesulfonate [Sc(OTf)3] catalyst (PS−Sc) under mild conditions. system, it is possible to synthesize poly(ϵ-caprolactone) PCL (Mn = 4.1−10.8 × 103) with low polydispersity (Mw/Mn 1.12−1.16). The Arrhenius equation was used investigate reaction kinetics. Furthermore, in two-step polymerization, molecular weight increased without broadening distributions. A...
We demonstrate a new system for the combination of chain and step polymerizations in which scandium trifluoromethanesulfonate [Sc(OTf)3] catalyzes both polymerization modes. Ring-opening ϵ-caprolactone initiated from diol was carried out acetonitrile at 45 °C (Mn =1.2 × 103−3.6 103, Mw/Mn = 1.3). After removing under reduced pressure, bulk polycondensation with methylsuccinic acid performed 100 15 h to give polyester an excellent yield (92−94%): Mn were respectively 1.4 104 1.9. To check...
Abstract To synthesize polyesters and periodic copolymers catalyzed by nonafluorobutanesulfonimide (Nf 2 NH), we performed ring‐opening copolymerizations of cyclic anhydrides with tetrahydrofuran (THF) at 50–120 °C. At high temperature (100–120 °C), the anhydrides, such as succinic anhydride (SAn), glutaric (GAn), phthalic (PAn), maleic (MAn), citraconic (CAn), copolymerized THF via to produce ( M n = 0.8–6.8 × 10 3 , / w 2.03–3.51). Ether units were temporarily formed during this...
Addition of Li<sup>+</sup> enhanced the radical polymerization <italic>N-n</italic>-propylmethacrylamide, in which stoichiometry monomer–Li<sup>+</sup> complexes determined stereospecificity polymerization.
Ring-opening polymerization (ROP) of ε-caprolactone using a polymer-supported scandium catalyst (PS-Sc) under mild conditions made it possible to synthesize poly(ε-caprolactone) (Mn = 4.1–10.8 × 103) with narrow polydispersity (Mw/Mn 1.12–1.22). The propagation rates were comparable that catalyzed by trifluoromethanesulfonate [Sc(OTf)3]. After polymerization, the was easily recovered and can be reused for ROP.
Isotactic-rich poly(<italic>N</italic>-vinyl-2-pyrrolidone) was successfully prepared by radical polymerization of <italic>N</italic>-vinyl-2-pyrrolidone assisted diethyl <sc>l</sc>-tartrate (<sc>l</sc>-EtTar) at low temperatures.
Cationic polymerization of isobutyl vinyl ether at elevated temperatures 60–100 °C, in which the propagating cations are stabilized with a solvate ionic liquid, is described.
Abstract Radical polymerization of N ‐ n ‐propyl‐α‐fluoroacrylamide (NNPFAAm) was investigated in several solvents at low temperatures the presence or absence Lewis bases, acids, alkyl alcohols, silyl fluorinated alcohols. Different effects and additives on stereospecificity were observed radical polymerizations NNPFAAm its hydrocarbon analogs such as ‐isopropylacrylamide (NIPAAm) ‐propylacrylamide (NNPAAm); for instance, syndiotactic (and heterotactic) specificities induced polar toluene...
The isoalloxazine ring system, called flavin, was successfully immobilized on poly(methacrylic acid)s, PMAAs, with different tacticity via post-polymerization modification under suitable conditions. resulting flavin-containing polymers showed catalytic activity for aerobic oxidation reactions, in which the polymer stereoregularity clearly influenced their activity.