Organic/inorganic hybrids have been studied since in 1980s. Preparation of organic/inoraganic hybrid composites has attracted much attention because such hybrids may show controllable physical properties, such as optical, electrical, and mechanical behaviors by combing the properties of both organic...
Organic/inorganic hybrids have been studied since in 1980s. Preparation of organic/inoraganic hybrid composites has attracted much attention because such hybrids may show controllable physical properties, such as optical, electrical, and mechanical behaviors by combing the properties of both organic polymers and inorganic compounds. In these organic/inorganic hybrids, the inorganic compounds precipitate in situ in a regular manner in the organic polymer matrix, and a strong interaction between them results in markedly improved mechanical properties. Poly(vinyl alcohol)(PVA) was obtained by low temperature saponification of polyvinyl acetate in methyl alcohol by NaOH. Generally PVA is prepared by wet spinning method. PVA is a semi-crystalline polymer whose hydroxyl groups produce inter- and intra-molecular hydrogen bondings. The extent of hydrogen bonding is greatly affected by stereogularity of hydroxyl groups. Thus hydrogen bonding has a profound effect on the rheological and mechanical properties of polymer, which can be largely determined by the density and spatial arrangement of hydroxyl groups. Moreover inter- and intra-molecular hydrogen bondings by hydroxyl groups may bring about complicated phenomena such as phase separation and gelation, which means the solution properties exhibit time-dependence. Thus, processing conditions(solvent, concentration, dissolving temperature, salt, etc.) should be carefully adjusted in spinning or film casting to obtain desired properties. In this study, organic/inorganic hybrids based on hydroxyapatite/PVA(50/50) hybrid composites were prepared and master powder for spinning dope was prepared by applying synthesis process of hydroxyapatite(HAp). HAp/PVA(0/100, 1/99, 3/97, 5/95, 10/90, 15/85) hybrid fibers were prepared by wet spinning process with dimethyl sulfoxide(DMSO). Shear viscosity of spinning dope was increased with increasing HAp content. The physical and surface properties of the hybrid fibers were greatly affected by the HAp content and the extent of dispersion of HAp particles in PVA matrix.
Organic/inorganic hybrids have been studied since in 1980s. Preparation of organic/inoraganic hybrid composites has attracted much attention because such hybrids may show controllable physical properties, such as optical, electrical, and mechanical behaviors by combing the properties of both organic polymers and inorganic compounds. In these organic/inorganic hybrids, the inorganic compounds precipitate in situ in a regular manner in the organic polymer matrix, and a strong interaction between them results in markedly improved mechanical properties. Poly(vinyl alcohol)(PVA) was obtained by low temperature saponification of polyvinyl acetate in methyl alcohol by NaOH. Generally PVA is prepared by wet spinning method. PVA is a semi-crystalline polymer whose hydroxyl groups produce inter- and intra-molecular hydrogen bondings. The extent of hydrogen bonding is greatly affected by stereogularity of hydroxyl groups. Thus hydrogen bonding has a profound effect on the rheological and mechanical properties of polymer, which can be largely determined by the density and spatial arrangement of hydroxyl groups. Moreover inter- and intra-molecular hydrogen bondings by hydroxyl groups may bring about complicated phenomena such as phase separation and gelation, which means the solution properties exhibit time-dependence. Thus, processing conditions(solvent, concentration, dissolving temperature, salt, etc.) should be carefully adjusted in spinning or film casting to obtain desired properties. In this study, organic/inorganic hybrids based on hydroxyapatite/PVA(50/50) hybrid composites were prepared and master powder for spinning dope was prepared by applying synthesis process of hydroxyapatite(HAp). HAp/PVA(0/100, 1/99, 3/97, 5/95, 10/90, 15/85) hybrid fibers were prepared by wet spinning process with dimethyl sulfoxide(DMSO). Shear viscosity of spinning dope was increased with increasing HAp content. The physical and surface properties of the hybrid fibers were greatly affected by the HAp content and the extent of dispersion of HAp particles in PVA matrix.
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