طراحي و مطالعه نانو كامپوزيت هاي پليمري حاوي N،N- (پيرومليتوئيل) -بيس-L -آمينو اسيد تقويت شده با روي اكسيد، مونت موريلونيت آلي دوست و نانو ذرات تيتانيوم دي اكسيد اصلاح شده با دي اسيدهاي زيست فعال

چكيده انگليسي :

Planning and Study on Polymer Nanocomposites Containing N N Pyromellitoyl bis L amino acid Reinforced with ZnO Organo montmorillonite and TiO2 Nanoparticles Modified with Bioactive Diacids Roghayeh Aalizadeh Eisini Allizadehr@yahoo com 2013 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree M Sc Language Farsi Supervisor Prof Shadpour Mallakpour E mail mallak@cc iut ac ir mallak777@yahoo com mallakpour84@alumni ufl edu Abstract In this study a series of novel poly amide imide PAI zinc oxide ZnO organo montmorillonite nanocomposites PZONCs were synthesized to investigate the effect of two nanofillers on properties of polymer matrix For this purpose at first optically active PAI was prepared via one step polycondensation of 4 4 methylenebis 3 chloro 2 6 diethylaniline with N N pyromellitoyl bis L phenylalanine diacid The structure of polymer was confirmed by different characterization methods such as fourier transform infrared spectroscopy FT IR 1H NMR and elemental analysis The surface of ZnO nanoparticles NPs were modified with aminopropyltriethoxysilane KH550 in order to better compatibility with polymer matrix Subsequently dispersion of silane coupling agent modified ZnO NPs in the obtained PAI matrix was performed using ultrasonic system In the other step organo montmorillonite was prepared via cation exchange reaction using natural L phenyl alanine amino acid Then PZONCs with 1 3 5 7 and 9 wt of organo montmorillonite contents were prepared via a solution intercalation technique The resulting PZONCs were characterized by different techniques including FT IR X ray diffraction XRD thermogravimetric analysis TGA and their morphology were investigated by field emission scanning electron microscopy FE SEM and transmission electron microscopy TEM In compared with the pure PAI the thermal properties indicated the heat stability of the PZONCs in present NPs content and dispersing organo montmorillonite in PAI was improved The XRD results implied that the organo montmorillonite layers are exfoliated in polymer matrix In the second project the surface of TiO2 NPs was modified with bioactive dicarboxylic acids DA s containing different natural amino acids such as L valine L methionine L leucine and L isoleucine The prepared DAs modified TiO2 NPs were studied with FT IR XRD TEM FE SEM and TGA techniques The FT IR and TGA results showed that the modifiers were grafted on the surface of TiO2 NPs Modified TiO2 NPs could be environmentally friendly due to the presence of bioactive DAs In the last project for studying the effect of surface modification on desperation of TiO2 NPs functional optically active PAI TiO2 NCs were successfully fabricated through ultrasonic technique Firstly the PAI containing L valine amino acid was synthesized via polycondensation of N N pyromellitoyl bis L valine diacid with 4 4 diaminodiphenylsulfone Then PAI TiO2 NCs containing 5 10 and 15 wt of DA modified TiO2 NPs were prepared via ultrasonic method through blending of DA modified TiO2 NPs with the PAI The properties of the synthesized NCs were studied by FT IR TGA FE SEM TEM UV vis spectroscopy and XRD techniques The TGA analysis indicated that the addition of DA modified TiO2 NPs into the PAI matrix enhances the thermal decomposition temperatures of the obtained NCs Due to present of both natural amino acid in polymer construction and DA modified TiO2 NPs in these NCs it would be appropriate to name them as bionanocomposites with biodegradability and biocompatibility properties Keyword Nanocomposite Zinc oxide nanoparticles Modified TiO2 nanoparticles Surface modi cation Bioactive coupling agent Organo montmorillonite

عالي زاده ايسيني، رقيه

نانو ذرات ZnO , نانو ذرات TiO2 اصلاح شده , اصلاح سطح , معرف اصلاح كننده زيست فعال