پديد آورنده :
عابديني، محمد
عنوان :
قابليت ترميم كنندگي خاصيت فوق آب گريزي پوشش پليمري حاوي ميكرو كپسول با ايجاد نانو زبري ها
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
خوردگي و حفاظت از مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
دوازده، 100ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
محمدعلي گلعذار، كيوان رئيسي
استاد مشاور :
روح ا...باقري
توصيفگر ها :
خود ترميم شوندگي , نانو ساختار , ميكروكپسوله كردن , اوره-فرمالدئيد
تاريخ نمايه سازي :
14/8/91
استاد داور :
احمد ساعتچي، اكبر خدامي
تاريخ ورود اطلاعات :
1396/09/20
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
101 Self Healing Ability of Superhydrophobic Property of Polymeric Coating Containing Microcapsules by Generation of Nanoroughness Mohammad Abedini m abedini@ma iut ac ir Date of Submission 2012 06 04 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Mohammad Ali Golozar golozar@cc iut ac irKeyvan Raeissi k raeissi@cc iut ac irAbstractIn this study using microcapsules containing calcium hydroxide and potassium stearate the self healing ability of surface nanostructures via regeneration of calcium stearate nanoneedles aftercrashing the microcapsules was achieved And the hydrophobicity of the surface was alsoimproved Calcium Hydroxide was microencapsulated in porous Poly methyl methacrylate ethylcellulose shell which calcium hydroxide agents diffused outwards by capillary force throughnanoporosity of PMMA EC shell Aqueous potassium stearate must encapsulate in a shell withlow scratch resistance in order to crash by microcracks and release its content Urea Formaldehydedue to its good strength scratch resistance and chemical stability has been widely used inmicroencapsulation of healing agents Therefore in the present study the aqueous potassiumstearate was encapsulated in a shell of Urea Formaldehyde Since the in situ polymerizationmethod for encapsulation of healing agent in Poly Urea Formaldehyde shell is restricted to oilyphases in this study a new method for encapsulation of aqueous core in Poly Urea Formaldehyde shell was introduced This new method opens a new approach in production ofself healing and hydrophobic coatings The Synthesized microcapsules were dispersed in epoxymatrix and coated by spin coating or dip coating methods on carbon steel substrate Then poly methyl methacrylate ethyl cellulose microcapsules were precipitated on top of the uncuredepoxy and calcium stearate nanoneedles form in expose to aqueous potassium stearate solution Water contact angles of self healing superhydrophobic coating before and after repair ofscratches were measured as 157 and 133 respectively which confirm the initialsuperhydrophobicity and partial recovery of hydrophobicity after surface scratch Tafelpolarization results revealed that by applying this superhydrophobic coating the corrosion currentdensity of plain carbon steel substrate is decreased up to two orders of magnitude Macroscopicstudies of the coatings after salt spray test confirmed the healing of scratches and the results ofelectrochemical impedance spectroscopy revealed corrosion and protection mechanisms ofcoatings based on the hydrophobic models Keywords hydrophobicity self healing nanostructure microencapsulation Urea Formaldehyde microcapsule nanoroughness
استاد راهنما :
محمدعلي گلعذار، كيوان رئيسي
استاد مشاور :
روح ا...باقري
استاد داور :
احمد ساعتچي، اكبر خدامي
