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Parvin Mansoori - One of the best experts on this subject based on the ideXlab platform.

  • Poly(vinyl alcohol) - chitosan blends: preparation, mechanical and physical properties
    Iranian Polymer Journal, 2003
    Co-Authors: S. Bahram Bahrami, Soheila S. Kordestani, Hamid Mirzadeh, Parvin Mansoori
    Abstract:

    P oly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a Cross-Linking Agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states, water uptake, surface tension and contact angle were characterized. Blending PVAand chitosan improved strength and flexibility of the films in the dry and wet states. Cross-Linking with glutaraldehyde improves tensile strength and decreases elon- gation of the films. PVA Content in the blends increases water uptake while Cross-Linking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents, Cross-Linking Agent and the pH of solution. Blending of PVAand chitosan improves bulk and surface hydrophilicity of blend- ed films. Iranian

  • Poly (vinyl alcohol) - Chitosan Blends: Preparation, Mechanical and Physical Prop- erties
    Iranian Polymer Journal, 2003
    Co-Authors: S. Bahram Bahrami, Soheila S. Kordestani, Hamid Mirzadeh, Parvin Mansoori
    Abstract:

    P oly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a Cross-Linking Agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states, water uptake, surface tension and contact angle were characterized. Blending PVAand chitosan improved strength and flexibility of the films in the dry and wet states. Cross-Linking with glutaraldehyde improves tensile strength and decreases elon- gation of the films. PVA Content in the blends increases water uptake while Cross-Linking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents, Cross-Linking Agent and the pH of solution. Blending of PVAand chitosan improves bulk and surface hydrophilicity of blend- ed films. Iranian

Keiko En - One of the best experts on this subject based on the ideXlab platform.

  • Role of boric acid for a poly (vinyl alcohol) film as a Cross-Linking Agent: Melting behaviors of the films with boric acid
    Polymer, 2010
    Co-Authors: Tsukasa Miyazaki, Yuuki Takeda, Takahiko Itou, Akie Hoshiko, Sachiko Akane, Keiko En
    Abstract:

    We have investigated the role of boric acid as a Cross-Linking Agent for a poly (vinyl alcohol) (PVA) film when the film is immersed in boric acid aqueous solution. DSC results show that the films with boric acid exhibit the higher glass transition temperatures than that of the PVA film without boric acid, when the films are dried after immersing in boric acid aqueous solutions with various boric acid concentrations, implying that boric acid penetrating into the films slows down the PVA molecular motion. Furthermore, simultaneous small-angle X-ray scattering and wide-angle X-ray diffraction measurements were performed on the melting processes of the PVA films with boric acid. We found that the crystallite size increase originated from melting and recrystallization do not occur for the PVA films with boric acid, whereas in the case of the PVA without boric acid the crystallite size is enlarged in both directions parallel and perpendicular to the chain axis via melting and recrystallization on melting. These indicate that chemical reactions of boric acid to the PVA molecular chains in amorphous regions resulted in Cross-Linking points take place in boric acid aqueous solutions, inhibiting recrystallization on melting, because the cross-links slow down the PVA molecular motion and must not be included in the crystalline domains. © 2010 Elsevier Ltd.

S. Bahram Bahrami - One of the best experts on this subject based on the ideXlab platform.

  • Poly(vinyl alcohol) - chitosan blends: preparation, mechanical and physical properties
    Iranian Polymer Journal, 2003
    Co-Authors: S. Bahram Bahrami, Soheila S. Kordestani, Hamid Mirzadeh, Parvin Mansoori
    Abstract:

    P oly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a Cross-Linking Agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states, water uptake, surface tension and contact angle were characterized. Blending PVAand chitosan improved strength and flexibility of the films in the dry and wet states. Cross-Linking with glutaraldehyde improves tensile strength and decreases elon- gation of the films. PVA Content in the blends increases water uptake while Cross-Linking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents, Cross-Linking Agent and the pH of solution. Blending of PVAand chitosan improves bulk and surface hydrophilicity of blend- ed films. Iranian

  • Poly (vinyl alcohol) - Chitosan Blends: Preparation, Mechanical and Physical Prop- erties
    Iranian Polymer Journal, 2003
    Co-Authors: S. Bahram Bahrami, Soheila S. Kordestani, Hamid Mirzadeh, Parvin Mansoori
    Abstract:

    P oly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a Cross-Linking Agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states, water uptake, surface tension and contact angle were characterized. Blending PVAand chitosan improved strength and flexibility of the films in the dry and wet states. Cross-Linking with glutaraldehyde improves tensile strength and decreases elon- gation of the films. PVA Content in the blends increases water uptake while Cross-Linking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents, Cross-Linking Agent and the pH of solution. Blending of PVAand chitosan improves bulk and surface hydrophilicity of blend- ed films. Iranian

Tsukasa Miyazaki - One of the best experts on this subject based on the ideXlab platform.

  • Role of boric acid for a poly (vinyl alcohol) film as a Cross-Linking Agent: Melting behaviors of the films with boric acid
    Polymer, 2010
    Co-Authors: Tsukasa Miyazaki, Yuuki Takeda, Takahiko Itou, Akie Hoshiko, Sachiko Akane, Keiko En
    Abstract:

    We have investigated the role of boric acid as a Cross-Linking Agent for a poly (vinyl alcohol) (PVA) film when the film is immersed in boric acid aqueous solution. DSC results show that the films with boric acid exhibit the higher glass transition temperatures than that of the PVA film without boric acid, when the films are dried after immersing in boric acid aqueous solutions with various boric acid concentrations, implying that boric acid penetrating into the films slows down the PVA molecular motion. Furthermore, simultaneous small-angle X-ray scattering and wide-angle X-ray diffraction measurements were performed on the melting processes of the PVA films with boric acid. We found that the crystallite size increase originated from melting and recrystallization do not occur for the PVA films with boric acid, whereas in the case of the PVA without boric acid the crystallite size is enlarged in both directions parallel and perpendicular to the chain axis via melting and recrystallization on melting. These indicate that chemical reactions of boric acid to the PVA molecular chains in amorphous regions resulted in Cross-Linking points take place in boric acid aqueous solutions, inhibiting recrystallization on melting, because the cross-links slow down the PVA molecular motion and must not be included in the crystalline domains. © 2010 Elsevier Ltd.

Annemie Adriaens - One of the best experts on this subject based on the ideXlab platform.

  • corrosion resistance performance of cerium doped silica sol gel coatings on 304l stainless steel
    Progress in Organic Coatings, 2012
    Co-Authors: Roohangiz Zandi Zand, Kim Verbeken, Annemie Adriaens
    Abstract:

    Abstract The aim of this work is the synthesis and investigation of silane based organic–inorganic hybrid coatings, which can be used to improve the corrosion performance of steel structures subjected to a marine environment. The silane based sol–gel coatings were prepared by dip coating 304L stainless steel in a solution of organically modified silica sol made through hydrolysis and condensation of 3-glycidoxypropyl-trimethoxysilane (GPTMS) as precursor and bisphenol A (BPA) as a Cross-Linking Agent in an acid catalyzed condition. The influence of the addition of cerium and the use of bisphenol A as a Cross-Linking Agent on the microscopic features and morphology as well as on the corrosion resistance of the coatings were examined using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), neutral salt spray tests, potentiodynamic polarization and electrochemical impedance techniques. Results show that cerium modified nano-hybrid coatings exhibit a superior corrosion inhibition performance to that displayed by silica hybrid coatings. Additionally, data showed that the bisphenol A as a Cross-Linking Agent has a significant effect on the morphology and corrosion resistance of the cerium doped silica coating. Omitting the use of bisphenol A causes the creation of defects/cracks in the coating, thereby promoting diffusion of the aggressive electrolyte toward the substrate and decreasing the corrosion resistance of the coating.