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  • Original Article |

    The mechanism of the heat-induced gelation of ovalbumin (OVA) under acidic conditions and the effect of amphiphilic peptide additives on gelation were investigated using dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The molecular morphology and structure probed by DLS and SANS suggest that the heat-induced gelation of OVA solution forms a phase-separated structure. Heating of the solution of OVA and the peptide resulted in effective distribution of the peptide in the matrix of the heat-induced OVA gels and endowed the gel with increased strength.

    • Takashi Hiroi
    • , Kazu Hirosawa
    • , Yuya Okazumi
    • , Sai Venkatesh Pingali
    •  & Mitsuhiro Shibayama
  • Original Article |

    Single- and two-photon holographic recording was investigated in photopolymer material consisting of two types of monomers: acrylamide (BAP) and epoxy (BOPS). Thus a cationic ring-opening polymerization and free-radical polymerization of monomers were initiated simultaneously. The arylsulfonium salt—cationic derivative of thioxanthenonium (CDTX) was chosen as the photoinitiator. The refractive index change n1 and maximum recording rate (dn1/dt)max of holographic gratings were found in two-photon photoinitiation modes depending on the concentration of BAP (the molar fraction of BAP) in photopolymer composition.

    • Evgeny V. Vasilyev
    • , Vladimir V. Shelkovnikov
    • , Natalia A. Orlova
    • , Ilya Sh. Steinberg
    •  & Vladimir A. Loskutov
  • Original Article |

    Molecular structure of silica surface modifiers greatly controls the performance of silica-filled styrene-butadiene rubber (SBR) through interfacial characteristics of the composites. Soft nature of low molecular-weight hydroxyl terminated polybutadiene (HTPB) and small number of its covalent bounds to the rubber matrix was compared with large number of rigid covalent bounds made between bis(3-triethoxysilylpropyl)tetrasulfide (TESPT) and rubber. Despite the better dispersion of silica modified with the former, the latter ensures higher transfer of stress to particles at large strains, inducing improved strength and abrasion resistance to composites.

    • Nafise Torbati-Fard
    • , Seyed Mostaffa Hosseini
    •  & Mehdi Razzaghi-Kashani
  • Original Article |

    We investigated the biosynthesis and properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) produced by Haloferax mediterranei from glucose. Size-exclusion chromatography revealed that PHBV produced by H. mediterranei in flask cultures had a weight-average molecular weight of 4.7 × 106 g/mol, demonstrating production of ultrahigh-molecular-weight (UHMW) PHBV. The UHMW-PHBV (7 mol% 3-hydroxyvalerate, Mw = 4.4 × 106 g/mol) obtained by jar fermenter cultivation was used to produce tenfold cold-drawn films with a tensile strength of 258.7 MPa. This suggests that UHMW-PHBV has a potential for practical, strong films.

    • Kotaro Ino
    • , Shun Sato
    • , Kazunori Ushimaru
    • , Azusa Saika
    • , Tokuma Fukuoka
    • , Koichi Ohshiman
    •  & Tomotake Morita
  • Original Article |

    A fluorescence film sensor film was prepared from 2,2,6,6-tetramethyl-1-piperidinyloxy radical-oxidized cellulose nanofiber, which was chemically immobilized by the Cu2+- or Cs+-selective ligand, 3,5-bis(((2-hydroxynaphthalen-1-yl)methylene)amino)benzoic acid. The potential of the current sensor is that it is a film-type sensor with facile removal from test water without leaving sensing residue in the water.

    • Astrid Rahmawati
    • , Chuang-Fu Shih
    •  & Toyoko Imae
  • Original Article |

    The investigation of the effects of incorporating various phenolic compounds on the curing of bisphenol A dicyanate (BADCY) revealed that o-(dimethylamino)methylphenol (o-DAMP) was a very effective catalyst, which reduced the final curing temperature to 180 °C. The promoting effect of o-DAMP was due to the presence of a phenolic OH and a (dimethylamino)methyl groups at the ortho-positions of the molecule. The addition of o-DAMP improved the mechanical properties of the cured BADCY resins, and the most balanced properties were obtained when the ratio of OH to OCN was 0.05.

    • Keisuke Izu
    • , Yuichiro Tokoro
    •  & Toshiyuki Oyama

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