The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform

Kazukiyo Nagai - One of the best experts on this subject based on the ideXlab platform.

  • characterization and water vapor Sorption Property of aba type triblock copolymers derived from polyimide and poly methyl methacrylate
    Polymer International, 2014
    Co-Authors: Shinji Kanehashi, Shimpei Konishi, Shuichi Sato, Tetsuo Miyakoshi, Yusuke Koyama, Shota Ando, Ryohei Shindo, Sou Miyata, Kazukiyo Nagai
    Abstract:

    The characterization of ABA-type triblock copolymer films derived from polyimide (PI) macroinitiator and poly(methyl methacrylate) (PMMA) synthesized by atom transfer radical polymerization was investigated by focusing on different block lengths of PMMA. The hydrophobic Property tends to increase with increasing PMMA content in the triblock copolymers, while the PMMA blocks enhance the charge transfer interaction between the PI segments. The water vapor Sorption measurement of triblock copolymers was determined at 35 °C. The water vapor solubility of triblock copolymers tends to decrease with increasing PMMA content. In addition, linear correlations were observed between the solubility and polymer-free volume and polymer molecular polarity in triblock copolymers as well as in other conventional polymer families. According to Zimm−Lundberg analysis, the PMMA block segments in the triblock copolymers accelerate water vapor clustering due to the high mobility of PMMA. The mobility of PMMA block segments strongly affected not only physical properties but also the water vapor solubility of the triblock copolymers. The ABA triblock copolymerization composed of PI and PMMA is one of the effective ways to improve the hydrophobic Property. © 2013 Society of Chemical Industry

  • effect of substituted groups on characterization and water vapor Sorption Property of polyhedral oligomeric silsesquioxane poss containing methacryl polymer membranes
    Polymer, 2013
    Co-Authors: Shinji Kanehashi, Shuichi Sato, Tetsuo Miyakoshi, Yuko Tomita, Kohei Obokata, Takashi Kidesaki, Kazukiyo Nagai
    Abstract:

    Abstract The effects of substituted groups on the characteristics and water vapor Sorption Property of polyhedral oligomeric silsesquioxane (POSS)-containing methacryl polymers were investigated. A broad halo was observed in the X-ray diffraction profile, which suggests that all membranes were amorphous structure. Interestingly, the smaller volume of substituted groups tended to induce the larger deformation of POSS structure resulting from the packing of polymer segments. The introduction of ring-substituted POSS unit improved their thermal stability due to the increase in the rigidity. The Sorption behavior for all POSS-containing polymer membranes obeyed the dual-mode model at lower relative pressure and then upturns at higher pressure. The phenyl-POSS shows the high solubility due to the large excess free volume and suppression of hydrophobic POSS unit covered by the stacking effect. Based on these results, the introduction of POSS unit enhances the hydrophobic Property, while the polarity of substituted groups strongly affects the water vapor clustering.

  • effect of oh group on the water vapor Sorption Property of adamantane containing polymer membranes
    Journal of Membrane Science, 2013
    Co-Authors: Shinji Kanehashi, Shimpei Konishi, Kazuoki Takeo, Hiroshi Kawakita, Shuichi Sato, Tetsuo Miyakoshi, Kazukiyo Nagai
    Abstract:

    Abstract The synthesis and characteristics of adamantane-containing acryl or methacryl polymers were investigated, focusing on the effects of the hydrophobic adamantyl unit and the hydrophilic OH group. The water vapor Sorption Property of adamantane polymer membranes was determined at 35 °C. The membrane density which represents the packing of polymer segments increased with increasing the OH groups and the polymer cohesive energy density (CED), which reflects the polarity of polymers. The water vapor solubility in OH-containing adamantane polymer membranes was higher than that in non-OH-containing adamantanes due to the high interaction between the OH group and the water molecules. Therefore, the OH groups in the adamantane unit give the Sorption site of the water molecules in the membranes. In addition, we found that the stronger interaction by OH groups between the water molecules and polymers can prevent the clustering of water molecules based on the Zimm–Lundberg analysis.

Peng Wang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis structure and Sorption Property of metal complexes with mixed multicarboxylate and imidazole containing ligands
    Microporous and Mesoporous Materials, 2016
    Co-Authors: Peng Wang, Takaaki Okamura, Gaochao Lv, Yi Lu
    Abstract:

    Abstract Zinc(II) and nickel(II) frameworks [Zn2(L)(BTC)(NO3)]·H2O·2CH3CN (1), [Ni2(L)(H2O)3(HBTC)2]·3.6H2O (2), [Ni(L)(H2O)2](BPDC)·2H2O (3), [Ni(L)(H2O)(BPDC)]·4H2O (4) and [Ni2(L)(MeOH)4(BPDC)2]·2H2O (5) were synthesized by reactions of corresponding metal salts with 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and multicarboxylic acids of 1,3,5-benzenetricarboxylic acid (H3BTC), 4,4′-biphenyldicarboxylic acid (H2BPDC). Complex 1 is a 2-fold interpenetrating 3D net, while 2 is a 2D network with infinite 1D hinged Ni(II)-L chains linked by HBTC2− ligands. 3, 4 and 5 were obtained by using different molar ratios of L, H2BPDC and Ni(II) salt, and found to show different 2D network structures in which the numbers of coordinated carboxylate groups of BPDC2− are 0, 1 and 2, respectively. Sorption properties of 1–5 were investigated.

  • ph dependent cobalt ii frameworks with mixed 3 3 5 5 tetra 1h imidazol 1 yl 1 1 biphenyl and 1 3 5 benzenetricarboxylate ligands synthesis structure and Sorption Property
    CrystEngComm, 2013
    Co-Authors: Gaochao Lv, Peng Wang, Kai Chen
    Abstract:

    An exploration of reactions of 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and 1,3,5-benzenetricarboxylic acid (H3BTC) with Co(II) salt has led to the formation of three new complexes with different framework structures, [Co2(L)(HBTC)2(μ2-H2O)(H2O)2]·3H2O (1), [Co3(L)2(BTC)2]·4H2O (2) and [Co2(L)(BTC)(μ2-OH)(H2O)2]·2H2O (3). They were obtained as pH-dependent products. The H3BTC ligand is partially deprotonated in 1, but completely in 2 and 3. Furthermore, a bridging OH− is present in 3. Complex 1 consists of infinite Co(II)–L chains bridged into a layered structure via carboxylate groups of HBTC2−. In case of 2, it has a Co(II)–L 2D network which is further linked by BTC3− resulting the formation of a final 2D structure (2D + 2D → 2D). While in 3, it is a 3D framework with Co(II)–L layers connected by BTC3−. The results showed that the pH plays an important role in determining the structure of the frameworks. The Sorption properties of the complexes were investigated.

  • dynamic porous metal organic frameworks synthesis structure and Sorption Property
    CrystEngComm, 2012
    Co-Authors: Takaaki Okamura, Peng Wang
    Abstract:

    Three new porous metal–organic frameworks {[Co(L)(PIN)]·dioxane·H2O}n (1), {[Co(L)(DPE)]·0.5DPE}n (2) and {[Co(L)(BPE)]·4H2O}n (3) with the same 2-fold interpenetrating hms topology based on 5-(pyridin-4-yl)isophthalate (L2−) and different pillar ligands of N-(4-pyridyl)isonicotinamide (PIN), 1,2-di(4-pyridyl)ethylene (DPE) and 1,2-bis(4-pyridyl)ethane (BPE) have been prepared and characterized by IR, thermogravimetric analysis, single crystal and powder X-ray diffractions. Interestingly, 1 possesses a flexible framework upon desolvation and H2O/MeOH/EtOH vapor adSorption, and the desolvated sample exhibits a stepwise uptake of CO2 (195 K), H2O (298 K) and MeOH (298 K). More importantly, the desolvated 1 shows high enthalpy of CO2 adSorption and high selectivity for CO2 over N2 as well as H2O/MeOH over EtOH at 298 K.

  • porous cobalt ii imidazolate supramolecular isomeric frameworks with selective gas Sorption Property
    Chemical Communications, 2011
    Co-Authors: Peng Wang, Shuisheng Chen, Min Chen, Satoshi Takamizawa, Gaochao Lv
    Abstract:

    Two porous supramolecular isomeric frameworks show unique Sorption properties, one with temperature dependent stepwise and hysteretic selective Sorption of CO2 while the other one shows gas uptake capacity for CO2, N2, H2 and CH4 at low temperature and selective Sorption of CO2 over N2 around room temperature.

Gaochao Lv - One of the best experts on this subject based on the ideXlab platform.

  • synthesis structure and Sorption Property of metal complexes with mixed multicarboxylate and imidazole containing ligands
    Microporous and Mesoporous Materials, 2016
    Co-Authors: Peng Wang, Takaaki Okamura, Gaochao Lv, Yi Lu
    Abstract:

    Abstract Zinc(II) and nickel(II) frameworks [Zn2(L)(BTC)(NO3)]·H2O·2CH3CN (1), [Ni2(L)(H2O)3(HBTC)2]·3.6H2O (2), [Ni(L)(H2O)2](BPDC)·2H2O (3), [Ni(L)(H2O)(BPDC)]·4H2O (4) and [Ni2(L)(MeOH)4(BPDC)2]·2H2O (5) were synthesized by reactions of corresponding metal salts with 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and multicarboxylic acids of 1,3,5-benzenetricarboxylic acid (H3BTC), 4,4′-biphenyldicarboxylic acid (H2BPDC). Complex 1 is a 2-fold interpenetrating 3D net, while 2 is a 2D network with infinite 1D hinged Ni(II)-L chains linked by HBTC2− ligands. 3, 4 and 5 were obtained by using different molar ratios of L, H2BPDC and Ni(II) salt, and found to show different 2D network structures in which the numbers of coordinated carboxylate groups of BPDC2− are 0, 1 and 2, respectively. Sorption properties of 1–5 were investigated.

  • synthesis characterization and selective hysteretic Sorption Property of metal organic frameworks with 3 5 di pyridine 4 yl benzoate
    CrystEngComm, 2014
    Co-Authors: Yue Zhao, Gaochao Lv, Xiaoliang Zhao, Yi Lu
    Abstract:

    Three new metal–organic frameworks (MOFs) {[Zn(L)(HCOO)(H2O)]·H2O}n (1), {Cd(L)2}n (2) and {Co(L)(BDC)0.5(H2O)}n (3) [HL = 3,5-di(pyridine-4-yl)benzoic acid, H2BDC = 1,4-benzenedicarboxylic acid] were synthesized by hydro/solvothermal reactions and characterized by elemental analysis, thermogravimetric analysis, IR spectroscopy, powder and single crystal X-ray diffraction. Complex 1 is a two-dimensional (2D) network with {63} topology, which is further assembled into a three-dimensional (3D) supramolecular architecture through hydrogen bonding interactions. Complex 2 is a 2-fold interpenetrating 3D framework with a point (Schlafli) symbol of {63}{67·83}, while 3 is a 3D net formed by interpenetration of 2D bilayers (2D + 2D → 3D) with a point (Schlafli) symbol of {63}{66}. Selective and hysteretic Sorption of carbon dioxide (CO2) was found for 3 at 195 K, and the photoluminescence properties of 1 and 2 were investigated.

  • ph dependent cobalt ii frameworks with mixed 3 3 5 5 tetra 1h imidazol 1 yl 1 1 biphenyl and 1 3 5 benzenetricarboxylate ligands synthesis structure and Sorption Property
    CrystEngComm, 2013
    Co-Authors: Gaochao Lv, Peng Wang, Kai Chen
    Abstract:

    An exploration of reactions of 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and 1,3,5-benzenetricarboxylic acid (H3BTC) with Co(II) salt has led to the formation of three new complexes with different framework structures, [Co2(L)(HBTC)2(μ2-H2O)(H2O)2]·3H2O (1), [Co3(L)2(BTC)2]·4H2O (2) and [Co2(L)(BTC)(μ2-OH)(H2O)2]·2H2O (3). They were obtained as pH-dependent products. The H3BTC ligand is partially deprotonated in 1, but completely in 2 and 3. Furthermore, a bridging OH− is present in 3. Complex 1 consists of infinite Co(II)–L chains bridged into a layered structure via carboxylate groups of HBTC2−. In case of 2, it has a Co(II)–L 2D network which is further linked by BTC3− resulting the formation of a final 2D structure (2D + 2D → 2D). While in 3, it is a 3D framework with Co(II)–L layers connected by BTC3−. The results showed that the pH plays an important role in determining the structure of the frameworks. The Sorption properties of the complexes were investigated.

  • porous cobalt ii imidazolate supramolecular isomeric frameworks with selective gas Sorption Property
    Chemical Communications, 2011
    Co-Authors: Peng Wang, Shuisheng Chen, Min Chen, Satoshi Takamizawa, Gaochao Lv
    Abstract:

    Two porous supramolecular isomeric frameworks show unique Sorption properties, one with temperature dependent stepwise and hysteretic selective Sorption of CO2 while the other one shows gas uptake capacity for CO2, N2, H2 and CH4 at low temperature and selective Sorption of CO2 over N2 around room temperature.

Sanjana Kankane - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of water Sorption Property and in vitro blood compatibility of poly 2 hydroxyethyl methacrylate phema based semi interpenetrating polymer networks ipns
    Journal of Materials Science: Materials in Medicine, 2008
    Co-Authors: A K Bajpai, Sanjana Kankane
    Abstract:

    pH responsive smart biomaterials of gelatin and poly(2-hydroxyethyl methacrylate-co-acrylic acid) were synthesized by redox polymerization and characterized by FTIR, Environmental Scanning Electron Microscopy (ESEM). The prepared environmental responsive biomaterials containing polyelectrolyte segments were assessed for their water Sorption potential under varying experimental conditions. The diffusion mechanism of transport of water molecules arising due to solvent-polymer interaction was also analysed to predict the behaviour of continuously relaxing macromolecular chains. The in vitro blood compatibility of the prepared polymeric hydrophilic materials was evaluated by methods such as blood clot formation, platelet adhesion, percent haemolysis and protein-adSorption study on the surface of the prepared biomaterials.

  • preparation and characterization of macroporous poly 2 hydroxyethyl methacrylate based biomaterials water Sorption Property and in vitro blood compatibility
    Journal of Applied Polymer Science, 2007
    Co-Authors: A K Bajpai, Sanjana Kankane
    Abstract:

    A semi-interpenetrating polymer network (IPN) comprising gelatin and poly(2-hydroxyethyl methacrylate-co-acrylamide) was prepared and characterized by FTIR, environmental scanning electron microscopy (ESEM) and differential scanning calorimetry (DSC) techniques. The water Sorption potential of the prepared semi-IPNs was investigated for varying chemical architecture of the IPN, and experimental conditions such as pH, temperature and ionic strength of the swelling media. The semi-IPNs were also judged for in vitro blood compatibility by performing blood clot, percent hemolysis, protein adSorption and platelet adhesion tests. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1559–1571, 2007

Shinji Kanehashi - One of the best experts on this subject based on the ideXlab platform.

  • characterization and water vapor Sorption Property of aba type triblock copolymers derived from polyimide and poly methyl methacrylate
    Polymer International, 2014
    Co-Authors: Shinji Kanehashi, Shimpei Konishi, Shuichi Sato, Tetsuo Miyakoshi, Yusuke Koyama, Shota Ando, Ryohei Shindo, Sou Miyata, Kazukiyo Nagai
    Abstract:

    The characterization of ABA-type triblock copolymer films derived from polyimide (PI) macroinitiator and poly(methyl methacrylate) (PMMA) synthesized by atom transfer radical polymerization was investigated by focusing on different block lengths of PMMA. The hydrophobic Property tends to increase with increasing PMMA content in the triblock copolymers, while the PMMA blocks enhance the charge transfer interaction between the PI segments. The water vapor Sorption measurement of triblock copolymers was determined at 35 °C. The water vapor solubility of triblock copolymers tends to decrease with increasing PMMA content. In addition, linear correlations were observed between the solubility and polymer-free volume and polymer molecular polarity in triblock copolymers as well as in other conventional polymer families. According to Zimm−Lundberg analysis, the PMMA block segments in the triblock copolymers accelerate water vapor clustering due to the high mobility of PMMA. The mobility of PMMA block segments strongly affected not only physical properties but also the water vapor solubility of the triblock copolymers. The ABA triblock copolymerization composed of PI and PMMA is one of the effective ways to improve the hydrophobic Property. © 2013 Society of Chemical Industry

  • effect of substituted groups on characterization and water vapor Sorption Property of polyhedral oligomeric silsesquioxane poss containing methacryl polymer membranes
    Polymer, 2013
    Co-Authors: Shinji Kanehashi, Shuichi Sato, Tetsuo Miyakoshi, Yuko Tomita, Kohei Obokata, Takashi Kidesaki, Kazukiyo Nagai
    Abstract:

    Abstract The effects of substituted groups on the characteristics and water vapor Sorption Property of polyhedral oligomeric silsesquioxane (POSS)-containing methacryl polymers were investigated. A broad halo was observed in the X-ray diffraction profile, which suggests that all membranes were amorphous structure. Interestingly, the smaller volume of substituted groups tended to induce the larger deformation of POSS structure resulting from the packing of polymer segments. The introduction of ring-substituted POSS unit improved their thermal stability due to the increase in the rigidity. The Sorption behavior for all POSS-containing polymer membranes obeyed the dual-mode model at lower relative pressure and then upturns at higher pressure. The phenyl-POSS shows the high solubility due to the large excess free volume and suppression of hydrophobic POSS unit covered by the stacking effect. Based on these results, the introduction of POSS unit enhances the hydrophobic Property, while the polarity of substituted groups strongly affects the water vapor clustering.

  • effect of oh group on the water vapor Sorption Property of adamantane containing polymer membranes
    Journal of Membrane Science, 2013
    Co-Authors: Shinji Kanehashi, Shimpei Konishi, Kazuoki Takeo, Hiroshi Kawakita, Shuichi Sato, Tetsuo Miyakoshi, Kazukiyo Nagai
    Abstract:

    Abstract The synthesis and characteristics of adamantane-containing acryl or methacryl polymers were investigated, focusing on the effects of the hydrophobic adamantyl unit and the hydrophilic OH group. The water vapor Sorption Property of adamantane polymer membranes was determined at 35 °C. The membrane density which represents the packing of polymer segments increased with increasing the OH groups and the polymer cohesive energy density (CED), which reflects the polarity of polymers. The water vapor solubility in OH-containing adamantane polymer membranes was higher than that in non-OH-containing adamantanes due to the high interaction between the OH group and the water molecules. Therefore, the OH groups in the adamantane unit give the Sorption site of the water molecules in the membranes. In addition, we found that the stronger interaction by OH groups between the water molecules and polymers can prevent the clustering of water molecules based on the Zimm–Lundberg analysis.