تهيه و شناسايي بيو نانوكامپوزيت هاي جديد فعال نوري پلي ﴿استر-آميد﴾/اكسيد روي مشتق شده از N،N-بيس [ 2-متيل 3-﴿4-هيدروكسي فنيل﴾پروپانوآت﴾] ايزوفتال آميد و دي اسيد كلرايدهاي آروماتيك

چكيده انگليسي :

Preparation and Characterization of Novel Optically Active Poly ester amide ZnO Bionanocomposites Derived from N N Bis 2 methyl 3 4 hydroxyphenyl propanoate isophthaldiamide and Aromatic Diacid chlorides Sedigheh Borandeh s borande@yahoo com January 29 2011 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree M Sc Language Farsi Dr A Abdolmaleki Email abdolmaleki@cc iut ac ir amirabdolmaleki@yahoo com Prof S Mallakpour Email mallak@cc iut ac ir mallak777@yahoo com mallakpour84@alumni ufl edu Abstract In this project N N Bis 2 methyl 3 4 hydroxyphenyl propanoate isophthaldiamide as a biodagradable monomer containing chiral group was prepared by the reaction of s tyrosine methyl ester with isophthaloyl dichloride A series of novel optically active and biodegradable poly ester amide s PEA s based on tyrosine amino acid were prepared by the solution polycondensation of new diol monomer with several aromatic diacid chlorides were synthesized For this purpose optimized conditions in term of reaction time and temperature were studied and the influence of the time of reaction on the inherent viscosity and the yield of the PEA were examined According to these results the optimum condition was selected for the synthesis of the PEAs Thus one equimolar of synthesized diol with one equimolar of different diacid chlorides were reacted for 12 h at room temperature and the resulting mixture was precipitated in methanol to obtain polymers The resulting PEAs exhibited good yields high thermal stability with inherent viscosities ranging between 0 25 and 0 42 dL g and are soluble in polar aprotic solvents The synthetic polymers were characterized by FT IR 1H NMR specific rotation elemental and thermogravimetric analysis TGA techniques and typical ones by 13C NMR differential scanning calorimetry DSC X ray diffraction XRD and field emission scanning electron microscopy FE SEM analysis Because of the existence of amino acid in the monomer and polymer backbone these materials are expected to be biodegradable therefore in the next part of the project biological and biodegradability properties of synthetic diol and one of the polymers were investigated Soil burial test of the diphenolic monomer and obtained polymer and soil enzymatic assay showed that the synthesized diol and its polymer are biologically active and probably biodegradable in soil environment Finally to improve the dispersion and obtain the homogeneous distribution of ZnO nanoparticles in polymer matrix the surface of nanoparticle was modified with two different silane coupling agent methacryloxypropyltrimethoxy silane KH570 and aminopropyltriethoxyl silane KH550 and was mixed with one of the prepared polymers which its biological properties were investigated In this way the organic chains of silane coupling agents can accomplish steric hindrance between inorganic nanoparticles and the process of agglomerate formation is extensively reduced and the hydrophobicity of the surface of nanosized ZnO is obviously enhanced Novel poly ester amide ZnO bionanocomposites PEA ZnO BNCs were prepared by embedding of different ZnO nanoparticle contents into polymer matrix via ultrasonic method as a facial and inexpensive route The resulting bionanocomposites were characterized by FT IR XRD TGA DSC FE SEM atomic force microscopy AFM and transmission electron microscopy TEM From these results it can be found that there is no primary chemical bonding between PEA and modified ZnO nanoparticles Therefore the comparatively weak interaction secondary chemical bonding such as hydrogen bonding between C O KH570 or NH2 groups of KH550 and N H in PEA unmodified OH groups on the surface of ZnO nanoparticle with ester and amide groups C O of PEA and dipole dipole interaction between C O KH570 and ester group in PEA may exist throughout of the polymer matrix Also the FE SEM AFM and TEM results indicated that the ZnO particles were dispersed homogenously in nano scale in P

برنده، صديقه

آمينواسيدتيروسين , زيست تخريب پذيري , عامل جفت كننده سايلان دار