پديد آورنده :
مبشري، مينا
عنوان :
بررسي اثر بخار آب/ بخار حلال بر مورفولوژي نانوالياف در فرآيند ريسندگي الكتروسانتريفيوژ
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي
صفحه شمار :
يازده، ۶۰ص.: مصور، جدول، نمودار
استاد راهنما :
عبدالكريم حسيني راوندي، افسانه ولي پوري
توصيفگر ها :
نانوالياف , الكتروسانترفيوژ , پلي سولفون , رطوبت نسبي , تخلخل
استاد داور :
صديقه برهاني، داريوش سمناني
تاريخ ورود اطلاعات :
1396/12/13
چكيده فارسي :
5 2 8 بررسي تاثير سرعت چرخش نازل بر روي تخلخل سطحي الياف 34 2 3 بررسي تاثير تركيب حاللها بر تخلخل سطحي الياف توليد شده 24 2 10 سازوكار شكلگيري تخلخل الياف 24 2 00 بررسي نتايج آزمون 45 BET 2 30 بررسي كمي تخلخلها با استفاده از برنامه سنجش تخلخل 14 2 20 بررسي زاويه تماس الياف تهيهشده توسط دستگاه الكتروسانتريفيوژ 14 2 40 پراش اشعه ايكس 47 XRD فصل چهارم نتيجهگيري و پيشنهادات 4 0 نتيجهگيري 05 چكيده نانوالياف به دليل سطح ويژهي بسيار باال كاربردهاي گستردهاي دارند و با ايجاد تخلخل در الياف سطح ويژهي آنها به طور قابل توجهي افزايش مييابد در اين پژوهش با بهرهگيري از سامانهي ريسندگي الكتروسانتريفيوژ نانوالياف پليسولفون با مورفولوژيهاي سطحي متنوع ايجاد گرديد برخي پارامترهاي اثرگذار بر مورفولوژي الياف شامل سيستم حالل سرعت زاويهاي سامانه ريسندگي و رطوبت نسبي محيط نه
چكيده انگليسي :
65Abstract Nanofibres are widely used due to their high levels of special surface and increased porosityin fibers resulting in a significant increase in their specific surface In this study polysulphon nanofibers with various surface morphologies were developed usingelectroscentrifuge spinning system Some parameters influencing the fiber morphologyincluding the solvent system angular velocity of the spinning system and relative humidityof the environment were studied through electron microscopy field propagation absorbanceand depletion porosity BET and contact angle The acetone dimethylformamide solventsystem has a higher ability to produce porous nanofibers than thetetrahydrofuran dimethylformamide solvent system due to its higher vapor pressure Eventhe porosity of the fibers derived from the acetone dimethylformamide system has spreadthroughout the bundle Also the relative humidity of the environment had a significant effecton the porosity or superficial shrinkage of the fibers increasing the relative porosity orshrinkage of the fibers by increasing relative humidity The increase in angular velocity leadsto elongation of porosity and increased fiber diameter so that the mean diameter of thepolysulfone polymer nanofibers produced from the DMF ACETONE solution at a relativehumidity of 75 at a Different velocity spinning speeds of 1500 and 3000 rpm wereobtained at 1357 and 2718 nm respectively The results of the BET test confirmed themicroscopic observations With the increase in relative humidity and the use of theacetone dimethylformamide system despite increasing average fiber diameter porosity andspecial surface of the fiber increased so that The total porosity volume of the fibers in themoisture content of 30 4 50 4 and 70 6 respectively was 6 210 and 270 mm3 andthe mean diameter of the porosity was 10 78 41 66 and 36 31 nm respectively The ContactAngle test was performed and it was determined that XRD X ray diffraction analysis wasalso performed and it was found that the presence of moisture in the vicinity of the fluid jetthat flies to the collector did not affect the crystallinity of the fibers The possibility of a highproduction of nanofibres in the electroscentrifuge spinning system as well as easy access toa variety of surface morphologies cotrol in this system promises to improve the efficiencyof porous nano fibre filtration systems Key word Nanofibers electrocentrifuge polysulfene related humidity porosity نه
استاد راهنما :
عبدالكريم حسيني راوندي، افسانه ولي پوري
استاد داور :
صديقه برهاني، داريوش سمناني
