8579

7960

كارشناسي ارشد

پليمر

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1392

سيزده،54ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

شادپور ملك پور

مهدي ديناري

11/12/92

امير عبدالملكي، كاظم كرمي

شيمي

ID7960

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

55 Surface Functionalization of ZnO Nanoparticles with Bioactive N trimellitylimido L amino acid Dicarboxylic acids as Novel Modifiers for the Preparation of Poly amide imide ZnO Nanocomposites Containing Alanine Amino acid Vajiheh Behranvand Jazi V Behranvand@yahoo com 5 January 2014 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R IranDegree M Sc Language FarsiSupervisor Prof Shadpour Mallakpour E mail mallak@cc iut ac ir mallak777@yahoo com mallakpour84@alumni ufl edu Abstract In this study the surface of Zinc oxide nanoparticles ZnO NPs was modified with optically active andbioactive dicarboxylic acids DA s containing different natural amino acids such as L leucine L alanine L phenylalanine L methionine and L valine The surface modification was essential for decreasing of theagglomeration of NPs and improving of their compatibility with organic and biological environments such aspolymer matrix The process was accomplished under ultrasonic method as a fast low cost and green way The prepared DAs modified ZnO NPs were studied with FT IR XRD TEM FE SEM and TGA techniques Thermal analysis confirmed grafting of DAs on the surface of NPs From comparing of TGA curve ofmodified ZnO NPs with its pure can be concluded that the presence of DA on the surface of NPs is about 11wt According to the normal distribution curve modified ZnO NPs with DAs based on different aminoacids have good dispersion In the other investigation poly amide imide ZnO nanocomposites PAI ZnONCs were successfully fabricated through ultrasonic technique The most important aims of this project werethe effect of surface modification on the dispersion of ZnO NPs also the influence of ZnO on the thermalstability and UV absorption of the polymer matrix For this purpose at the first the optically active PAI wasproduced by the polycondensation reaction of N trimellitylimido L alanine DA with 4 4 diaminodiphenylmethane in the presence of triphenyl phosphite and the molten tetra n butylammoniumbromide Then NCs containing 4 8 and 12 wt of DA modified ZnO NPs were prepared via ultrasonicmethod through blending of DA modified ZnO NPs with the PAI The properties of the synthesized NCswere studied by FT IR XRD UV vis FE SEM TEM and TGA techniques Comparing of the normaldistribution curve of NCs 4 8 and 12 showed the better dispersion of the ZnO NPs in to the polymermatrix for NC of 12 wt due to its narrower curve The UV absorption was improved by employing of ZnONPs as efficient filler in NCs T5 and T10 of the composites dramatically increased about 10 20 C and 5 Crespectively when compared with neat PAI Keyword Zinc oxide nanoparticles Amino acid Optically active dicarboxylic acids Surface modi cation ofnanoparticles Poly amide imide Nanocomposite Ultrasonic irradiation

شادپور ملك پور

مهدي ديناري

امير عبدالملكي، كاظم كرمي