پديد آورنده :
همايوني ،هما
عنوان :
تعيين شرايط بهينه توليد ريز لايه هاي كيتوسان /پلي وينيل الكل و كيتوسان خالص به روش الكتروريسي و بررسي خواص فيزيكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تكنولوژي نساجي
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان ،دانشكده نساجي
صفحه شمار :
چهارده ،124 ، [II]ص. :مصور،جدول،نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
عبدالكريم حسيني
توصيفگر ها :
كيتين , د استيلاسيون , روش هرو ويتز،رگبي و ولفرام،بروسيگناك،فوجيتا , نانوالياف , اسيد استيك , طيف FTIR
تاريخ نمايه سازي :
06/09/86
استاد داور :
عليرضا مرادي،سيد سعيد نوري خراشاني
چكيده فارسي :
به فارسي و انگليسي :قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractIn contrary with the slow development of new textile materials production of nanofibersthrough electrospinning has attracted the attention of many researchers because of theirunique properties and remarkable advantages Doubtless the utilization of biopolymers along with the new approaches in electrospinningof polymers will have excellent rewarded issues in medical and industrial applications Among various well know biopolymers electrospinning of chitosan has had manyprogression due to its particular characteristics but the polyelectrolyte effect of chitosanincreases the viscosity of the solution and complicates its electrospinning In this study an attempt is made to produce nanofibers of chitosan and its blend withpolyvinylalcohol Pilot studies failure in electrospinning of pure high molecular weight chitosan conduced toemploying of a hydrolization method in NaOH 50 and high temperature afterward in thefirst instance the blend of 5hours hydrolyzed chitosan PVA in volume ratios 50 50 60 40and 70 30 were electrospun successfully Concerning to the effect of hydrolization in reduction of chitosan molecular weight thisprocess prolonged to 8 12 16 24 and 48 hours and finally 48 hours hydrolyzed chitosanwas suitable for production of pure chitosan nanofibers with 140 40 nm diameter As another effective parameter the concentration of Acetic Acid as the solvent wasreduced from 90 to 80 and 70 with acceptable results The investigation of the nanofibers physical properties showed 74 increment of reginmoisture from 8 to 13 95 in comparison with chitosan powder Besides chitosannanofibers could keep theit structure in water after 3 hours It should be stated that the diameter of nanofibers decreases by increasing of the chitosanportion
استاد راهنما :
عبدالكريم حسيني
استاد داور :
عليرضا مرادي،سيد سعيد نوري خراشاني
