تهيه و شناسايي پليمرهاي جديد حاوي گروه سولفونيك اسيد و نانو كامپوزيت جديد پلي ﴿ايميد و سولفيد﴾ بر پايه نانو ذرات نقره، از بيس مالئيميد حاوي گروه آويزان اسيدي

چكيده انگليسي :

79 Synthesis and Characterization new sulfonic acid containing polymers and new poly imidosulfide Ag Nanocomposite Elahe Sorvand elahe sorvand@yahoo com September 11 2012Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree M Sc Language FarsiDr A Abdolmaleki Email abdolmaleki@cc iut ac ir amirabdolmaleki@yahoo comAbstract Maleimide polymers have applications in the area of composite materials due to their good thermalstability chemical resistance and mechanical properties The major shortcoming of bismaleimidesystems is brittleness which results in low damage tolerance and poor processing characteristics Various attempts have been made to improve the impact and fracture toughness of polybismaleimidematerials One of the suitable reactions is the Michael additions of nucleophiles and thiols are generallygood nucleophile cused as heteroatomic donors in the Michael addition Existtence of sulfur hasimportant role in preparation of biopolymers and these polymers can be engineering plastics with highapplications in medicine Also polymers containing acidic pendent group are attend for synthesis ofnanocomposite Therfore in first section of this project bismalimide 3 5 bis dioxo 2 hydro pyrol 1 5 hydro yl benzamido benzoic acid as monomer were synthesized through reaction of 4 malimidobenzoyl chloride and 3 5 diamino benzoic acid Novel poly imidosulfide have been synthesized byMicheal addition reaction between synthesized bismalimide and diamine contaning pendent acidicgroup Influence of the reaction time on the inherent viscosity and the yield were examined Acordingto these resultes The best condition were used Synthetic polyimidosulfide have good yield andviscosity and were characterized by FT IR 1H NMR elemental thermogravimetric analysis TGA and X ray diffraction XRD techniques In order to existence acidic pendent group ionization and theformation of the negatively charged in polymer structure are expected polymer intraction with metalsion As a result novel nanocomposite via sol gel reaction of the synthesized poly imidosulfide andAg ion and throughout the reduction of metals were prepared The resulting nanocomposite werecharacterized by FT IR XRD TGA FE SEM EDX and TEM The TEM result indicated that the Agparticles were dispersed homogenously in nano scale in polymer matrix Because of existence silvernanoparticles in the nanocomposite structure its antibacterial properties were studied Renewable andenvironmentally friendly energy sources will be essential for an ever changing and populous planet The most attractive alternative energy sources are fuel cells and Polymer electrolyte membranes PEMs are key componentsthat determine the cost and performance of polymer electrolyte membranefuel cells PEMFCs The most recent studies on PEMFCs have primarily focused on developing newproton conducting membranes for operation at highertemperatures under lower humidiCcationconditions so in the second section of the project the disodium salts of the 3 3 disulfonated 4 4 dichlorodiphenyl sulfone were synthesized via the sulfonation of 4 4 dichlorodiphenyl sulfone sulfonewith fuming sulfuric acid at 110oC then new disulfonatedpoly arylene ether sulfone copolymerscontaining carboxylic acid group on increase the ion exchange capacity for use in fule cell weresynthesized by direct copolymerization of sulfonated aromatic dihalide and some of bisphenols 1H NMR FTIR thermogravimetric analysis TGA was used to identify and characterize the sulfonatedcopolymers also data of elemental analysis it confirmed These copolymers have high yield andmoderate viscosity 0 15 0 28 dl g and exhibit good solubility in organic solutions sodium saltcopolymers dissolve in large volumes of water The resulet of pH meteric titration of copolymersindicated good ion exchange capacity IEC therefor these copolymers is good candidate for use infule cell membranes Keyword Polyimido sulfide Bismalimide Nanocomposite Antibactrial Sulfonated po

سروند، الهه

تهيه و شناسايي پليمرهاي جديد حاوي گروه سولفونيك اسيد و نانو كامپوزيت جديد پلي ﴿ايميد و سولفيد﴾ بر پايه نانو ذرات نقره، از بيس مالئيميد حاوي گروه آويزان اسيدي

پلي اترسولفون , غشاي تبادل پروتون , پيل سوختي