5135

292 دكتري

دكتري

شيمي آلي - پليمر

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1388

يازده، 154 ص.: مصور، جدول، نمودار.

ص. ع. به فارسي و انگليسي

شادپور ملك پور

مهران غياثي

15/2/1389

بهزاد رضايي،‌ امير عبدالملكي،‌ فرامرز افشار طارمي،‌ سعيد نوري خراساني

شيمي

ID292 دكتري

به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال

Synthesis of New Polymer Titania Nanocomposites and Optically Active Polymers Containing L Methionine and L Leucine Amino Acids Using Microwave irradiation and Linic Liquids Hojjat Seyedjamali seyedjamali@yahoo com hsj@ch iut ac ir Feb 21 2010 Department of Chemistry Isfahan University of Technology 84159 83111 Isfahan I R Iran Prof S Mallakpour Email mallak@cc iut ac ir mallak777@yahoo com mallakpour84@alumni ufl edu Isfahan University of Technology 84156 83111 Isfahan Iran Abstract In this thesis the synthesis and characterization of novel amino acid containing polyesters polyamides polyureas and polyimide TiO2 nanocomposites are investigated At first a new diacid monomer containing L methionine moiety was synthesized characterized and then polymerized with different aromatic diole and diamines to obtain corresponding polyesters and polyamides respectively Resulted polymers were characterized by FT IR 1H NMR specific rotation measurements elemental analysis differential scanning calorimetry and thermogravimetric analysis techniques The results confirmed that obtained optically active polymers possess high organosolubility in dipolar aprotic solvents In addition the use of microwave irradiation and ionic liquid as green reaction media was examined The next part of investigations concerned the synthesis and characterization of novel L leucine contaning nanocomposites A new diamine monomer was synthesized and polymerized with pyromellitic dianhydride at room temperature to produced corresponding poly amic acid In continuation Ti OEt 4 and acetyl acetone were added and whole mixture underwent casting and then thermal imidization The generated water as imidization byproduct hydrolyzed Ti 4 to titania nanoparticles via an insitu sol gel process Different percentage of polyimide titania nanocomposites were synthesized by assuming the complete conversion of Ti 4 to titania Obtained nanocomposites were characterized by means of thermogravimetric analysis Transmission electron microscopy Atomic force microscopy FT IR UV Vis and X ray diffraction techniques The results confirmed the insitu generation of almost spherical amorphous titania nanoparticles in the polyimide matrix Increase the thermal stability and UV absorption of polymer matrix are some characteristics of synthesized new L amino acid containing nanocomposite films At last with the polymerization of the synthesized diamine and different diisocyanates new series of polyureas were obtained in organic solvent as well as ionic liquid media Resulted polyureas showed excellent organosolubility in aforementioned solvents beside their good thermal stability which were confirmed via thermal gravimetric analysis Keywords Polyester Polyamide Polyurea Poly amic acid Polyimide L Methionine L Leucine Optically active Ionic liquid Microwave irradiation TiO2 Nanocomposite Sol gel Introduction Polyamides PA s polyesters PE s and polyureas PU s are among the most essential artificial polymers which are recognized by high strength recovery elevated flex life at high temperatures and capability to simply crystallize Gies et al 2004 Mohanty et al 1998 Caouthar et al 2007 They find plenty of diverse applications in high tech areas such as aviation automobile and electronic industries due to their high temperature and chemical resistance Zuev et al 2006 Chern et al 1998 However the poor solubility and high softening or melting temperatures caused by the high rigidity and the ability to form an

شادپور ملك پور

مهران غياثي

بهزاد رضايي،‌ امير عبدالملكي،‌ فرامرز افشار طارمي،‌ سعيد نوري خراساني