10325

765 دكتري

دكتري

شيمي آلي - پليمر

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1393

بيست و يك، 147ص.:مصور، جدول، نمودار

امير عبدالملكي، شادپور ملك پور

حميد جواهريان نقاش، مجيد كلاهدوزان

1394/04/20

غلامعلي كوهمره، حسن حدادزاده،مهران غياثي

شيمي

ID765 دكتري

به فارسي و انگليسي

Fabrication characterization and properties of optically active polymeric nanocomposites based on amino acid functionalized graphene and cyclodextrin modified ZnO nanoparticles Sedigheh Borandeh s borande@yahoo com s borande@ch iut ac ir February 2015 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree PhD Language Farsi Supervisors Dr A Abdolmaleki and Prof S Mallakpour Email abdolmaleki@cc iut ac ir abdolmaleki@gmail com mallak@cc iut ac ir mallak777@yahoo com mallakpour84@alumni ufl edu Abstract In this research at the first project graphite nanosheets were covalently functionalized with natural nontoxic and biodegradable amino acids such as L phenylalanine S tyrosine L alanine L isoleucine L leucine L methionine and S valine by simple and green procedure The amino acid functionalized graphene layers were characterized by several techniques and their thermal and electrical properties were investigated Then L phenylalanine functionalized graphene were used as filler in the polymeric nanocomposite synthesis In polymer nanocomposite synthesis the challenges are achieving well dispersion of nanofiller and its maximum interfacial interaction with polymer matrix at low loading percent In the next project the preparation of poly vinyl alcohol PVA bionanocomposites with L phenylalanine functionalized graphene f graphene using a simple water solution processing method is reported The obtained PVA f graphene bionanocomposite membranes were smooth uniform and flexible The fabricated bionanocomposites were investigated and studied by different analytical methods like FT IR XRD TGA FE SEM and TEM The mechanical properties of the bionanocomposite membranes were also studied The elastic modulus tensile strength and strain were obtained from this investigation Efficient interaction was found between f graphene and PVA matrix which caused significant improvement in mechanical and thermal properties of the graphene based bionanocomposite with homogeneous dispersion In the third part in order to develop functionalized graphite without damaging the graphitic basal plane nanographite was edge selectively functionalized with biosafe L phenylalanine amino acid through direct Friedel Crafts acylation reaction in poly phosphoric acid phosphorus pentoxide medium This technique led to graft amino acid moieties to the defective sites mostly sp2 C H located mainly on the edges of graphite via electrophilic substitution reaction The resultant functionalized graphite was characterized with various techniques and its thermal and electrical properties were examined Then a new series of nanocomposites based on optically active poly amide ester imide derived from L phenylalanine containing diacid and S tyrosine containing diol were fabricated using edge functionalized graphite as nanofiller through solution mixing method The fabricated nanocomposites were investigated and studied by different analytical methods like FT IR XRD TGA FE SEM and TEM In the forth project for increasing graphene usage graphene ZnO hybrid was prepared using biosafe L phenylalanine functionalized graphene In this regard ZnO nanoparticles NPs were modified by aminopropyltriethoxyl silane KH550 and were covalently attached on functionalized graphene sheets by reaction of amino groups on the outer wall of ZnO NPs with the carboxyl groups existing on the graphene surface Microscopic analysis of resulted hybrid revealed good dispersion of ZnO NPs on the graphene

امير عبدالملكي، شادپور ملك پور

حميد جواهريان نقاش، مجيد كلاهدوزان

غلامعلي كوهمره، حسن حدادزاده،مهران غياثي