LAGUNA DESIGN

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  • Original Article |

    Mechanical properties of rubber nanocomposites are believed to closely related to the chain dynamics at the interface with fillers. We here tackle this hypothesis combining traditional rheological measurements with our published results obtained by a modern technique of interfacial sensitive spectroscopy.

    • Shin Sugimoto
    • , Manabu Inutsuka
    • , Daisuke Kawaguchi
    •  & Keiji Tanaka
  • Note |

    The equilibrium melting temperature ( $$T_{\mathrm{m}}^0$$ T m 0 ) of natural rubber crystals was reexamined by the Hoffman–Weeks plot and the Gibbs–Thomson plot using the lamellar thickness obtained from the same sample as the one used for the measurement of melting temperature. The sample was prepared from deproteinized latex. As a result, the $$T_{\mathrm{m}}^0$$ T m 0 of NR was estimated to be 61 °C. At the same time, the fold-surface free energy was estimated to be 0.046 Jm−2. These values should be more reliable than the previously assumed values.

    • Masatoshi Tosaka
    •  & Daiki Kumagawa
  • Original Article |

    The block glycopolymers with specific arrangement of sugar ligand and electric charges were synthesized via RAFT living radical polymerization, where the block polymers were efficiently obtained using two orthogonal reactions of Huisgen and thiol-epoxy ring opening reactions. The molecular recognition abilities of the block glycopolymers was examined.

    • Takahiro Oh
    • , Kazuki Jono
    • , Yuri Kimoto
    • , Yu Hoshino
    •  & Yoshiko Miura
  • Original Article |

    Controlled cationic cyclopolymerizations of divinyl ethers with cyclohexene, norbornene, norbornane, cyclic acetal, or adamantane moiety were carried out. High-molecular-weight star-shaped cyclopolymers were synthesized by the reaction of the formed living cyclopolymers with a small amount of divinyl ether crosslinking agent. Glass transition temperatures (Tg’s) of both the cyclopolymers and star-shaped cyclopolymers were as high as 145−229 oC. Methacrylate-terminated end-functionalized star-shaped cyclopolymers were synthesized by the functionalized initiator-based living cationic cyclopolymerization of divinyl ethers followed by the chain linking reactions among the formed living cyclopolymers with divinyl ether crosslinker. The obtained end-functionalized star-shaped cyclopolymers were subjected to thermal crosslinking reaction to give star-shaped cyclopolymer networks with film-forming ability.

    • Takafumi Yamamoto
    • , Tamotsu Hashimoto
    • , Michio Urushisaki
    •  & Toshikazu Sakaguchi
  • Original Article |

    Pd-initiated polymerization of diazoacetates containing oligo(ethylene glycol)-substituted cyclotriphosphazenes was conducted to yield carbon-carbon main chain polymers bearing an oligo(ethylene glycol)-substituted cyclotriphosphazene on every main chain carbon atom. The resulting organic–inorganic poly(substituted methylene)s were found to show an LCST-type phase separation in aqueous media, and thus their thermosensitive behavior was evaluated by turbidity measurements.

    • Hiroaki Shimomoto
    • , Tomohiro Yamada
    • , Tomomichi Itoh
    •  & Eiji Ihara
  • Original Article |

    We synthesized poly(bisphenol A-co-ephichlorohydrin)–titanium phosphonate clusters (Ti4P3: [Ti43-O)(OiPr)5(μ-OiPr)3(O3PPh)3]·thf; Ti4P4: [Ti(OiPr)(acac)(O3PPh)]4; Ti7P6: Ti73-O)2 (OiPr)6(μ-OiPr)6(O3PBnBr)6). From the result of swelling test using tetrahydrofuran, Ti7P6 cluster showed highest cross-linking efficiency.

    • Ryohei Hayami
    • , Wataru Nakamoto
    • , Yohei Sato
    • , Kazuki Yamamoto
    •  & Takahiro Gunji
  • Technical Review |

    Tommykaira ZZ with Teijin’s PC pillar-less front window. The world’s first PC pillar-less front window was developed by using Teijin’s polymer material engineering, injection press and hard coating technologies. These technologies can overcome issues for plastic glazing, such as scale up and long-term reliability and provide low optical distortion window and much higher scratch and weather resistance compared to plastic glazing in the market. These technologies can also contribute to driver’s safety and provide more enjoyable sightseeing. Teijin aims to be a total solution provider for automobile manufacturers.

    • Toshiaki Hotaka
    • , Fumitaka Kondo
    • , Ryo Niimi
    • , Fumihiro Togashi
    •  & Yume Morita
  • Original Article
    | Open Access

    Polypeptides containing periodic aromatic residues, 4-aminobenzoic acid (Abz), in their main chains were synthesized via papain-catalyzed chemoenzymatic polymerization of tripeptide ester monomers under moderate conditions in aqueous buffers. The secondary structures of the Abz-containing polypeptides were investigated by IR and wide-angle X-ray diffraction analysis. The WAXD profile of poly(GlyAbzGly) was similar to that of polyGly, whereas poly(AlaAbzAla) adopted a sheet-like structure similar to the β-sheet of polyAla.

    • Kousuke Tsuchiya
    • , Naruki Kurokawa
    • , Joan Gimenez-Dejoz
    • , Prashant G. Gudeangadi
    • , Hiroyasu Masunaga
    •  & Keiji Numata
  • Original Article |

    We synthesized cellulose nanofiber (CNF) modified with 9,9′-bis(aryl)fluorene, possessing cardo moieties (BCNF), and evaluated the properties of its polyamide 6/66 (PA) composites. As a result, it was revealed that BCNF was well dispersed in PA and had a strong reinforcing effect—even in a temperature range above the glass transition temperature—compared with unmodified CNF. This is attributed to the improvement of the interface affinity between BCNF and PA derived from the bulky and hydrophobic structure of BPFG.

    • Masayuki Sugimoto
    • , Masahiro Yamada
    • , Hirokazu Sato
    •  & Katsuhisa Tokumitsu