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    Effect of non-covalent chemical modification on the electrical conductivity and tensile properties of poly(methyl methacrylate)/carbon nanotube composites
    (Society of Plastics Engineers, 2013) Koysuren O.; Karaman M.; Ozyurt D.
    Non-covalent chemical modification by initiated chemical vapor deposition technique is applied to carbon nanotubes to reduce average agglomerate size of the nanoparticles in the polymer matrix and to improve surface interaction between the composite constituents. Carbon nanotube (CNT) surfaces are coated conformally with thin poly-glycidyl methacrylate (PGMA) polymer film and coated nanoparticles are incorporated in poly(methyl methacrylate) (PMMA) polymer matrix using solvent casting technique. Conformai PGMA coatings around individual nanotubes were identified by SEM analysis. TEM and optical microscopy analyses show homogeneous composite morphology for composites prepared by using PGMA coated nanotubes. FTIR and XPS analyses show the successful deposition of polymer with high retention of epoxide functionality. PGMA coating of carbon nanotubes exhibits improvement in electrical conductivity and tensile properties of PGMA-CNT/PMMA systems when compared with uncoated nanoparticles.
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    Electrospun polyvinyl borate/poly(methyl methacrylate) (PVB/PMMA) blend nanofibers -- 2
    (Society of Plastics Engineers, 2013) Koysuren H.N.; Koysuren O.; Dinc H.
    The aim of this study was to prepare polyvinyl borate (PVB)/poly(methyl methacrylate) (PMMA) blend nanofibers by electrospinning process. Polyvinyl borate was synthesized by the condensation reaction of polyvinyl alcohol and boric acid. Since polyvinyl borate itself was not suitable for electrospinning process, polyvinyl borate was blended with poly(methyl methacrylate) prior to electrospinning process. A series of nanofibers with various polyvinyl borate concentrations in poly(methyl methacrylate) were prepared. PVB/PMMA blend nanofibers were characterized by fourier transform infrared spectroscopy (FTER) and scanning electron microscopy (SEM). FTIR analyses showed that boron atoms were found to be integrated into the polymer network. According to SEM images, blending PMMA with PVB decreased the fiber diameter from 218 nm to 93 nm and resulted in appearing the bead structures along the fibers, which increased the surface roughness PVB/PMMA blend nanofiber mats. The water wetting property of PVB/PMMA blend nanofiber mats was influenced by the surface roughness. The contact angle increased with increasing the PVB content of PVB/PMMA blend nanofibers, enhancing the surface roughness. This study also aimed to assess the thermal behavior of PVB/PMMA blends using the thermogravimetric analysis (TGA). The blend composition with the highest polyvinyl borate content was found to be suitable for thermally stable nanofiber formation according to the TGA results.