Parası kalmadığı için otobüse binemiyordur ailesi porno izle ona daha yeni para gönderdiği için tekrar porno istemeye utanınca mecburen otostop çekmek için youporn çantasını alarak yol kenarına gelir etekli porno liseli türk kız yol kenarında dururken yanına yaklaşan porno kibar bir gencin onu gideceği yere kadar bırakmak porno izle istemesine çok mutlu olur arabaya bindiklerinde gideceği yer ile porno arabayı kullanan adamın gittiği yer arasında çok mesafe sex izle farkı olduğunu anlayan türk kız bu yaptığı porno indir iyilik karşısında arabada ona memelerini açar porno sapıklaşan adam yol kenarındaki hotelde durarak porno izle üniversiteli otostop çeken türk kızına odada sakso çektirip sikerProduction Of Polyacrylonitrile/ Boehmite Nanofibrous Composite Tubular Structures By Opposite-Charge Electrospinning With Enhanced Properties From A Low-Concentration Polymer Solution.| Abstract

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Abstract

Production Of Polyacrylonitrile/ Boehmite Nanofibrous Composite Tubular Structures By Opposite-Charge Electrospinning With Enhanced Properties From A Low-Concentration Polymer Solution.

Author(s): Habeeb SA

Polyacrylonitrile (PAN)/boehmite nanofibrous composite tubular structures were fabricated from dilute polymer solutions using an opposite-charge electrospinning method. The samples were characterized by X-ray diffraction, Differential scanning calorimetry, scanning electron microscopy, Fouriertransform infrared spectroscopy, fast Fourier transform, and tensile tests. The presence of boehmite nanoparticles in the electrospun PAN nanofibers prevented bead formation, resulting in uniform fibers with smaller diameters, and improved alignment from low-concentration PAN polymer solutions. 1 wt % boehmite-loaded nanofibrous composite tubular structure was selected as the optimal formulation to proceed with the crystallinity and tensile tests, which showed enhanced crystalline properties as well as an abrupt shift in tensile performance. The tensile properties of the nanofiber strongly depended on their crystalline properties. The strong intermolecular forces (hydrogen bonds) between the Al OH groups formed at the surface of boehmite nanoparticles and the polar CN groups along the polymer chains. In addition, the high electrical force between the two tips of the needles in the opposite charge set-up can contribute to the control of electrical jet deposition instability when using a low-concentration electrospinning solution, leading to enhanced properties.


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