سنتز، شناسايي و بررسي خواص نانو ساختارهاي جديد فعال نوري پلي ﴿آميد-ايميد﴾ حاوي دي آمين 4،4-متيلن بيس ﴿ 3-كلرو-2، 6-دي اتيل آنيلين﴾ و تهيه بيونانو كامپوزيت هاي پلي ﴿آميد-ايميد﴾ / تيتنايوم دي اكسيد

چكيده انگليسي :

Synthesis Characterization and Properties of Novel Nanostructures Optical Active Poly amide imid s Containing 4 4 Methylenebis 3 Chloro 2 6 Diethylaniline and Fabrication of Bionanocomposites Poly amide imide titanium Dioxide Kazem banihassan k banihasan@ch iut ac ir Date of Submission 2011 10 15 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Shadpour Mallakpour Mallak@cc iut ac irAbstractIn this thesis new optically active nanostructure poly amide imide s PAI s were synthesized via directpolycondensation reaction of diacids based on trimellitic anhydride and different amino acides with4 4 methylenebis 3 chloro 2 6 diethylaniline using tetra n butylammonium bromide and triphenylphosphite as a condensing agent and green media The formation of these nanostructure PAIs wasconfirmed by 1H NMR fourier transform inferared spectroscopy specific rotation elemental analysis X ray diffraction field emission scanning electron microscopy FE SEM and thermogravimetricanalysis TGA techniques The resulting polymers were obtained with good yield and moderateinherent viscosities ranging between 0 27 and 0 37 dL g The FE SEM micrographs and X raydiffraction showed that the obtained PAIs were nanostructure and noncrystalline polymers Also TGAexhibited that these polymers show good thermal stability and the decomposition temperature under thenitrogen atmosphere for 10 weight loss temperatures is in excess of 380 C All synthetic PAIs showhigh solubility in organic solvents such as N N dimethyl acetamide dimethyl sulfoxide dimethylformamide N methyl 2 pyrrolidone and sulfuric acid at room temperature In next step a newoptically active PAI was synthesized from the polymerization reaction of N trimellitylimido L isoleucine diacid with 4 4 methylenebis 3 chloro 2 6 diethylaniline using molten tetra n butylammonium bromide and triphenyl phosphite as a condensing agent and green media Then thesurface of titanium dioxide TiO2 nanoparticles was modified with aminopropyltriethoxyl silane as acoupling agent The obtained polymer and inorganic metal oxide nanoparticles were used to prepare ofPAI TiO2 nanocomposites through ultrasonic irradiation The formation of PAI was confirmed by 1H NMR fourier transform IR spectroscopy specific rotation and elemental analysis The resultingpolymer was synthesized with good yield and moderate inherent viscosities around 0 27 dL g Theresulting nanocomposites were also characterized by FT IR powder X ray diffraction FE SEM transmission electron microscopy TEM and TGA Furthermore morphology study of resulting NCsby FE SEM and TEM analyses showed that TiO2 NP was dispersed homogenously in the polymermatrix The obtained PAI TiO2 NCs show also improved thermally stability compared with the purepolymer TGA confirmed that the heat stability of the nanocomposites was improved in the presence ofTiO2 nanoparticles Transmittance behavior of the obtained PAI TiO 2 nanocomposites was investigatedby UV vis spectroscopy Finally the biodegradability of the monomers and prepared polymers wasinvestigated in culture media and soil burial test for assessment of the susceptibility of thesecompounds to microbial degradation The results showed that the synthesized monomers and theirsderived polymers are biologically active and nontoxic to microbial growth The results showed that thesynthesized monomers and theirs derived polymers were biologically active and nontoxic to microbialgrowth Due to the existence of naturally occurring amino acids as biological chiral resources it ispredictable that these polymers to be biodegradable In vitro toxicity studies and soil biodegradationtest verified that prepared polymers could be decomposed by soil microorganisms and therefore theyare biodegradable Keywords Nanostructure Optically active polymer Bionanocomposite Poly amide imide TiO2nanoparticles

بني حسن، كاظم

پليمر فعال نوري , Tio2 , معرف اصلاح كننده , پايداري حرارتي , زيست تخريب پذيري