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Sohrab Rahmani,Amin Shafiei zadeh Mahani 한국고분자학회 2015 Macromolecular Research Vol.23 No.11
A novel bisethynyl monomer containing 1,3,4-oxadiazole unit, 2,5 bis(4-propargloxy phenyl)-1,3,4-oxadiazole, was synthesized and polymerized with diazido monomers (2,2 bis[4-(4-azidobuthyl)phenyl]propan and 1,4- diazidobutane) using ‘‘Click’’ chemistry to form novel polyaromatic ethers contining 1,3,4-oxadiazole and triazole units. The resulting polymers were characterized by using IR(infrared) and 1H NMR (nuclear magnetic resonance) techniques. The molecular weight of the resulting polymers, however, seemed relatively low according to their solution viscosity values [ηinh (inherent viscosity)=0.18 and 0.22 dL/g (deciliter/gram)]. The solubility experiments show that the obtained polymers have lower solubility in organic solvents due to their crystallinity which was confirm by X-ray diffraction but have good solubility in NMP solvent. In addition, the polymers exhibit good thermal stability and relatively high Tg (glass transition temperature) under N2 (Nitrogen) atmosphere.
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Sohrab Rahmani,A. A. Entezami 한국고분자학회 2011 Macromolecular Research Vol.19 No.3
Syndiotactic polystyrene-graft-polydimethylsiloxane copolymers were synthesized using a two-stage process and characterized. First, the syndiotactic polystyrene copolymer, poly(styrene-co-p-methylstyrene) was prepared by the copolymerization of styrene and p-methylstyrene with cyclopentadienyltitanium trichloride/methylaluminoxane catalyst. The obtained copolymer was grafted with polydimethylsiloxane by the anionic ring-opening polymerization of hexamethylcyclotrisiloxane with a metallation reagent. The effect of the solvent on the degree of grafting in the obtained copolymers was investigated. ^1H NMR, ^13C NMR, FTIR spectroscopy and differential scanning calorimetery (DSC) were used to examine the structure and thermal behavior of the copolymers. The degree of graft was higher in THF. The melting, crystallization and glass-transition temperatures of the graft copolymers decreased with increasing degree of graft in the copolymers.
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