Polymer-Organic Chemistry Shiraz University, Iran, 1999 – 2002 Thesis: Synthesis, Characterization, and Properties of Wholly Aromatic Poly(amide-imide)s Derived from Some New Imide-containing Dicarboxylic Acids and Various Kinds of Aromatic Diamines Supervisor: Prof. Ahmad Banihashemi Subject Class: Polymer Synthesis and Characterization
Polymer-Organic Chemistry Sharif University of Technology, Iran, 1997 – 1999 Thesis: Synthesis of Polyamides Based on Aliphatic Dinitriles and Study on the Structure-Properties Relationship Supervisor: Prof. Ali Pourjavadi Subject Class: Polymer Synthesis and Characterization
Pure Chemistry University of Mazandaran, Iran, 1994 – 1997 Subject Class: Pure Chemistry
Organic Chemistry I, II and III (BS)
Advanced Organic Chemistry (MS)
Fundamentals of Polymer Chemistry (BS)
Polymer Synthesis (MS)
Advanced Polymer Chemistry (PhD)
Organic Chemistry Labs (BS)
Synthesis of Organic Compounds (BS)
New Topics in Organic Chemistry (PhD)
Application of Spectroscopy in Identification of Organic Compounds (BS)
Separation and Characterization of Organic Compounds (BS)
In this article, multi-walled carbon nanotubes (CNT's) were coated by poly(tetramethylene oxide) (PTMO) soft layer. PTMO was used for preparing segmented polyurethane (PU) films as well. PTMO-grafted CNT was utilized for loading into the PTMO-based segmented PU films in three different contents, i.e., 0.2, 0.4, and 0.8 wt.%. All PU-CNT nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The resulting nanocomposites were also investigated by thermogravimetric analysis (TG/DTG), differential thermal analysis (DTA), and dynamic mechanical thermal analysis (DMTA). DTMA results showed a significant increase in the storage moduli, especially at temperatures AUTHOR KEYWORDS: dynamic mechanical thermal analysis; poly(tetramethylene oxide)-based polyurethane; poly(tetramethylene oxide)-functionalized carbon nanotube; polymer-matrix nanocomposites; storage modulus INDEX KEYWORDS: Carbon films; Differential thermal analysis; Dynamic mechanical analysis; Dynamics; Elastic moduli; Enamels; Field emission microscopes; Fourier transform infrared spectroscopy; Grafting (chemical); Nanocomposites; Oxide films; Polymer matrix composites; Polyurethanes; Scanning electron microscopy; Thermogravimetric analysis; X ray diffraction; Yarn, D. dynamic mechanical thermal analyses (DMTA); Differential thermal analyses (DTA); Dynamic mechanical thermal analysis; Field emission scanning electron microscopy; Functionalized carbon nanotubes; Polymer matrix nanocomposites; Polytetramethyleneoxide; Segmented polyurethanes, Multiwalled carbon nanotubes (MWCN) PUBLISHER: John Wiley and Sons Inc.
INDEX KEYWORDS: Amines; Ammonium persulfate; Aniline; Aromatic compounds; Emulsification; Emulsions; High resolution transmission electron microscopy; Metal ions; Nanocomposites; Particle size; Polyaniline; Silver; Sodium sulfate; Synthesis (chemical); Thermogravimetric analysis; Transmission electron microscopy; Vulcanization agents; X ray diffraction, Ammonium peroxydisulfate; Average particle size; Emulsifier systems; Fourier transform infra reds; P-phenylene diamines; Phenylenediamines; Temperature regions; X-ray diffraction techniques, Sodium dodecyl sulfate PUBLISHER: John Wiley and Sons Inc.
In this research a diamine monomer containing two phenoxy phenylene lateral groups, 2,2'-bis[(p-phenoxy phenyl)]-4,4'-diaminodiphenyl ether (PPAPE) was used to prepare novel wholly aromatic polyimides by thermal or chemical two-step polycondensation reactions. Comonomers including pyromellitic dianhydride (PMDA), 4,4'-oxydiphthalic anhydride (ODPA), and 3,3',4,4'- benzophenonetetracarboxylic dianhydride (BTDA) were used for the polyimidization reactions. A reference polyimide was also prepared by the reaction of 4,4'-diaminodiphenyl ether (DADPE) with pyromellitic dianhydride (PMDA). The limited viscosity numbers as well as ̄n and ̄w values of the resulting polymers were determined. All PPAPE-resulted polyimides had excellent organosolubility in common polar solvents. A low crystallinity extent was only observed using their wide-angle X-ray diffractograms (WAXD). The prepared hinged polyimides could also be cast into transparent and flexible films. The glass transition temperatures of the resulting polyimides were determined by differential scanning calorimetry (DSC) analyses. The thermograms obtained from thermogravimetric analyses (TGA) showed that the phenoxy phenylene lateral groups attached to the macromolecular backbones had no substantial diminishing effect on the thermal stability of these structurally-modified polyimides.
The relationship between thermal decomposition temperature and structure of a new data set of eighty monomers of different polymers were studied by multiple linear regression (MLR). The stepwise method was used in order to variable selection. The best descriptors were selected from over 1400 descriptors including; topological, geometrical, electronic and hybrid descriptors. The effect of number of descriptors on the correlation coefficient (R) and F-ratio were considered. Two models were suggested, one model having four descriptors (R2 = 0.894, Q2 cv = 0.900, F = 172.1) and other model involving 13 descriptors (R2 = 0.956, Q 2 cv = 0.956, F = 125.4).
AUTHOR KEYWORDS: Cross validation; Geometrical descriptors; Polymer; Semi-empirical; Thermal decomposition temperature INDEX KEYWORDS: Decomposition; Linear regression; Thermolysis, Correlation coefficient; Cross validation; Descriptors; Multiple linear regressions; Semi-empirical; Stepwise methods; Thermal decomposition temperature; Variable selection, Polymers PUBLISHER: Korean Chemical Society
The direct preparation of various aromatic poly(urea-imide)s (5a 1- 5b4) from N-[3,5-bis(trimellitimido)phenyl]phthalimide (1) using diphenylphosphoryl azide (DPPA) was investigated. The polymers were obtained by the conversion of imide ring-containing diacid 1 to corresponding di(carbonyl azide) 2 with DPPA and then to diisocyanate 3 through the Curtius rearrangement of compound 2. This was followed by poly-addition of 3 with two aromatic diamines (4a and 4b). In order to compensate the diisocyanate shortage against the diamines, some excess amounts of the initial triimide-dicarboxylic acid 1 were used. The molecular weights of the resulting poly(urea-imide)s were evaluated viscometrically. The poly(urea-imide)s exhibited an excellent solubility in a variety of polar solvents. The crystallinity nature of the polymers was estimated by means of WXRD. The glass transition temperatures and the 10% wt loss temperatures of the polymers 5a3 and 5b3 were determined by DSC and TGA/DTG methods in nitrogen atmosphere, respectively. The transparent films of the resulting polymers were also prepared by casting the solution.
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