Inorganic chemistry articles within Polymer Journal

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  • Original Article |

    In this work, POSS with an acetylacetonato group (POSS-acac) and metal–coordination polymers comprising POSS-acac (CP(Metal)s) were synthesized. The possible structure of CP(Metal)s was estimated from the UV–Vis spectrum and the residual mass after burning off and the surface morphologies of the CP(Metal)s were observed using scanning electron microscopy.

    • Yohei Sato
    • , Ryohei Hayami
    •  & Takahiro Gunji

  • Original Article |

    Selective adsorption of trialkylaluminums (R3Al) in modified methylaluminoxane (MMAO) onto crosslinked terpolymer bearing bulky phenoxy groups was performed. The phenoxy groups on the terpolymer can more selectivity react with R3Al than the hydroxy groups on SiO2, and some R3Al was physically adsorbed into the terpolymer. As a result, more efficient removal of R3Al from MMAO solution was achieved. The propylene polymerization using terpolymer-treated MMAO as a cocatalyst was free from chain transfer reaction, which is generally derived from the residual R3Al.

    • Ryo Tanaka
    • , Mari Nishizono
    •  & Takeshi Shiono

  • Original Article |

    Bridged polysilsesquioxanes are promising materials for reverse osmosis membranes because they exhibit robust properties. To investigate the effects of the polarity and rigidity of organic components of the polymer on the water permeability of the membrane, two alkoxysilane monomers, 2,5-bis[2-(triethoxysilyl)vinyl]pyridine (BTES-VP) and 1,4-bis[2-(triethoxysilyl)vinyl]benzene (BTES-VB), were synthesized. Both membranes prepared from BTES-VP and BTES-VB rejected 95–97% of aqueous sodium chloride and displayed water permeances of 1.1 × 10−13 and 8.5 × 10−14 m3/(m2· Pa· s), respectively.

    • Kazuki Yamamoto
    • , Ibuki Saito
    •  & Takahiro Gunji

  • Original Article |

    Vinylcycloalkanes with 12-, 15-, and 21-membered rings were synthesized from commercially available cycloalkanones or cycloalkyl carboxylic acids derived from malonate and ω-bromo-α-alkenes. Pd complexes with diimine ligands promoted the isomerization polymerization of vinylcycloalkanes with 15- and 21-membered rings to afford polymers having cycloalkylene groups in the main chain. Vinylcycloheneicosane with a 21-membered ring afforded polymers with Mn up to 9700, whereas vinylcycloalkanes with smaller ring sizes (8- and 12-membered rings) yielded oligomers with Mn = 720–1600.

    • Daisuke Takeuchi
    • , Karin Nakamura
    •  & Kohtaro Osakada

  • Focus Review |

    In this focus review, our recent progress on hybrid polymers and supramolecules utilizing silicon and arsenic is overviewed. Novel materials design based on polyhedral oligomeric silsesquioxane (POSS) has been realized by focusing on the symmetry. Practical synthetic methods have opened new avenue to experimental studies on organoarsenic compounds.

    • Hiroaki Imoto

  • Original Article |

    Multi-walled carbon nanotube (MWCNT)/dendrimer sheet scaffolds, i.e., dendrimers attached to the surface of MWCNT buckypaper, were fabricated, and a hydroxyapatite (HAp) coating prepared on dendrimer-modified buckypaper using an alternate soaking process (ASP) is described. The amount of the HAp that is retained on the surface of the MWCNT/dendrimer sheet scaffolds depends on the dendrimer contents. Moreover, biomimetic crystallization of calcium phosphate on buckypaper in simulated body fluid (SBF) was carried out. TEM analysis of the resulting MWCNT/dendrimer sheet scaffolds revealed that the MWCNT backbone was covered with scaly crystals.

    • Tomoyuki Tajima
    • , Tomoaki Tanaka
    •  & Yutaka Takaguchi

  • Original Article |

    Synthesis and properties of borafluorene-containing conjugated polymers with various comonomers are presented. From the comparison with the gallafluorene copolymers, higher luminescent quantum yields were obtained from the borafluorene copolymers. Additionally, from the electrochemical measurements, it was shown that the electron-withdrawing property of the boron atoms led to the stabilization of LUMOs of the borafluorene copolymers. In the X-ray diffraction profiles, the significant peaks originated from π−π stacking and assembly of the side chains were observed. The borafluorene copolymers were more crystalline materials relative to the gallafluorene polymers.

    • Takuya Matsumoto
    • , Shunichiro Ito
    •  & Yoshiki Chujo

  • Original Article |

    Titanium phosphonate (TiOPPh: [Ti4(μ3-O)(OiPr)5(μ-OiPr)3(PhPO3)3]·thf) was synthesized. TiOPPh was mixed with poly(methyl methacrylate) (PMMA) or poly(vinyl alcohol) (PVA) to prepare organic–inorganic hybrid polymer films. The film using PMMA was formed by the interaction between organic and inorganic components. The temperatures of 10% weight loss of TiOPPh–PMMA were 30 °C higher than that of PMMA only. The film using PVA was formed by the alcohol exchange reaction between TiOPPh and PVA. The transparency of TiOPPh-PVA in the visible region was higher than that of PVA only.

    • Ryohei Hayami
    • , Keisuke Wada
    •  & Takahiro Gunji

  • Original Article |

    Free-standing calcite thin films containing a few wt% of organic polymer were obtained through repeated cycles of layer-by-layer deposition of the vaterite particles stabilized with an octacarboxy-terminated T8-caged silsesquioxane, followed by a phase transition to calcite, after a poly(diallyldimethylammonium chloride) (PDDA) layer or a multilayer of PDDA with poly(sodium 4-styrenesulfonate) were coated on the surface of the calcite thin films. Poly(allylamine hydrochloride) and poly(acrylic acid) were also applied for preparing calcite thin films on a glass substrate.

    • Sakina Miyauchi
    • , Hiroaki Imoto
    •  & Kensuke Naka

  • Original Article |

    The modulation of interparticle distances in aggregates of gold nanoparticles by light irradiation is described. Stable aggregates of a series of imidazolium-presenting gold nanoparticles were obtained via a photo-responsive mono-carboxylate linker. By irradiating the aggregates with ultraviolet, the photo-responsive linker was transformed, leading to the generation of another carboxyl group. As a result, the gold nanoparticles were tightly bound via the dicarboxylate linkers. These changes decreased the interparticle distances in the aggregates, as verified by microscopic observations, and can induce significant changes in their optical characteristics.

    • Kazuo Tanaka
    • , Kensuke Naka
    •  & Yoshiki Chujo

  • Original Article |

    Zn-based two-dimensional layer coordination framework was synthesized by ionothermal synthesis and its solid-to-solid phase transition was studied by X-ray diffraction, solid state nuclear magnetic resonance and impedance spectroscopy. The phase transition is originated from the order-to-disorder behavior of accommodated ammonium cations in the structure. It occurs rapidly and reversibly, and little volume change and high thermal stability were observed.

    • Wenqian Chen
    • , Satoshi Horike
    •  & Susumu Kitagawa

  • Invited Review |

    Half-metallocene complexes of the type CpM(L^L)X2 (L^L=chelating ligands) offer the advantage of catalyst modification: by changing one cyclopentadienyl ligand of metallocene complexes to other ligands such as three-, four-, five-, six- and seven-membered chelates, bidentate and tridentate coordination, and monoanionic, dianionic and trianionic system, steric and/or electronic modification of the coordination environment is much flexible. The structural uniqueness of the metal complexes and the effects of the chelate ring sizes on their productivity and activation processes of the metal complexes with cocatalysts are highlighted.

    • Hayato Tsurugi
    • , Keishi Yamamoto
    •  & Kazushi Mashima

  • Original Article |

    The structures and electronic states in polymorphs (Forms I–IV) of PVDF were calculated by the density functional theory at PBE0/cc-pVTZ level. The calculated lattice constants agreed well with experimental values. Derived electronic and vibrational frequencies corresponded closely with the experimental vXPS and IR/Raman spectra, respectively. The amounts of spontaneous polarization in the polar crystal forms (I, III, and IV) were calculated. Those for Forms III and IV were determined for the first time.

    • Akira Itoh
    • , Yoshiyuki Takahashi
    •  & Hirofumi Yajima

  • Original Article |

    The effect of US on the shear viscosity of water-soluble polymer solutions was studied. The 43 kHz US significantly decreased the shear viscosity of the solutions. FT-IR spectra obtained during the US exposure showed that hydrogen bonds in the aqueous polymer solution could be broken. US absorption model was proposed to explain US absorption and the breakage in the hydrogen bonds. US effect influenced the condition of water solvation to the water-soluble polymers.

    • Josue Addiel Venegas-Sanchez
    • , Motohiro Tagaya
    •  & Takaomi Kobayashi

  • Original Article |

    A new accepter unit, dimethyl-2H-benzimidazole, was prepared and utilized for the synthesis of the conjugated polymers containing electron donor–acceptor pair for organic photovoltaics. Dimethyl-2H-benzimidazole unit was designed to substitute the benzothiadiazole (BT) unit of PCDTBT. The advantage of dimethyl-2H-benzimidazole compared with the BT moiety of PCDTBT is to improve the solubility of the polymer while keeping the 1,2-quinoid form to lead coplanarity of the backbone.

    • Suhee Song
    • , Seo-Jin Ko
    •  & Hongsuk Suh

  • Original Article |

    The proton and carbon NMR resonances have been assigned for 3A-amino-3A-deoxy(2AS,3AS)-α-, β- and γ-CyDs (3α, 3β and 3γ). In these CyDs, a glucose residue has been replaced by an altro-pyranose unit with an axial hydroxyl group. Assignments were made with one-dimensional NMR and COSY, TOCSY, ROESY and CHSHF (heteronuclear shift correlation) spectra. Titration by NMR shift changes gave amino-group pKa values of 7.73 and 8.84 for 3β (left) and 6A-amino-6A-deoxy-β-CyD (6β, right), respectively.

    • Keiko Takahashi
    • , Keita Andou
    •  & Shoji Fujiwara

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