Solution properties of polyaniline

Yilmaz, Faris
Kucukyavuz, Zuhal
Solution properties of polyaniline (PANI) synthesized at various temperatures were studied using static light scattering (SLS), intrinsic viscosity, and dynamic light scattering (DLS). We demonstrated that average radius of gyration (R-g), intrinsic viscosity [eta], and average hydrodynamic radius (R-H), of polyaniline molecules in dilute N-methyl-2-pyrrolidinone (NMP) solutions increased with decreasing synthesis temperatures, i.e.; increasing molecular weight. SLS data demonstrate that second virial coefficient (A(2)) decreased with increasing particle sizes suggesting that solubility of PANI in NMP decreased with increasing particle sizes. We also find that the polymers extend as the polymer concentration is lowered and that the increase in the hydrodynamic radius can be expressed by a power law of the electrostatic screening length. This behavior is typical of polyelectrolytes in dilute solution, providing a basis for understanding the conformation changes of this metallic polymer in solution. (C) 2009 Society of Chemical Industry


TOKATLI, K; OZILGEN, M (Wiley, 1993-01-01)
Permeation of CO2 and O2 through a low density polyethylene film was studied with CO2-N2 MiXtures in the temperature range 263-283 K, and with CO2-O2-N2 mixtures in the range 257-313 K. The temperature dependence of the permeabilities of these gases agreed with the Arrhenius expression. The activation energy for carbon dioxide diffusion was between 3.53 x 10(4) and 3.74 x 10(4) J/mol; the activation energy for oxygen diffusion was 3.13 x 10(4) J/mol. The pre-exponential constant for oxygen was higher than t...
Mechanical properties of plasma surface-modified calcium carbonate-polypropylene composites
Akovali, G; Akman, MA (Wiley, 1997-02-01)
Calcium carbonate was surface-modified by plasma-polymerized acetylene and the effect of surface modification on the mechanical properties of calcium carbonate-polypropylene composites was investigated. Two different plasma polymerization conditions were selected and applied. Chemical structures of plasma-polymerized acetylene products were identified. Mechanical and thermal properties of the composites prepared were evaluated and the effects of surface modification on the extent of adhesion of filler to th...
ILTER, M; OZILGEN, M; ORBEY, N (Wiley, 1991-01-01)
Permeation of individual gases through a low density polyethylene package film with CO2-N2 and CO2-O2-N2 mixtures was simulated with a simple mathematical model. Permeabilities of carbon dioxide were of the order of 10(-12) m3/s m2atm/m with CO2-N2 systems. Including oxygen in the system did not change carbon dioxide permeabilities. Permeabilities of oxygen were of the order of magnitude of 10(-9) m3/s m2atm/m with this system. When a CO2-O2-N2 mixture was humidified no substantial change was observed i...
Nanocomposites based on blends of polyethylene
Işık, Fatma; Yılmazer, Ülkü; Department of Chemical Engineering (2005)
In this study the effects of compatibilizer type, organoclay type, and the addition order of components on the morphological, thermal, mechanical and flow properties of ternary nanocomposites based on low density polyethylene, LDPE were investigated. As compatibilizer, ethylene/methyl acrylate/glycidyl methacrylate, ethylene/glycidyl methacrylate, and ethylene/butyl acrylate/maleic anhydride; as organoclay Cloisite? 15A, Cloisite? 25A and Cloisite? 30B were used. All samples were prepared by a co-rotating t...
Solution behavior of Na sulfonated polystyrene: Dipole moment determinations
Güler, Hatice; Aras, Leyla; Vanderschueren, J. (Wiley, 1990)
Solution behavior of Na sulfonated polystyrene (NaSPS) ionomers with different percentages of sulfonate was studied by viscosity and dipole moment measurements. Two solvents of different character were chosen, i.e. dioxane (ϵ = 2.22) and dimethyl formamide (DMF, ϵ = 36) and their mixtures. The reduced viscosity as a function of concentration in polar solvents reflects the ‘polyelectrolyte’ behaviour of the ionomers. Mean‐squared dipole moment (<μ2>/x) values were calculated over a temperature range of 20–1...
Citation Formats
F. Yilmaz and Z. Kucukyavuz, “Solution properties of polyaniline,” POLYMER INTERNATIONAL, pp. 552–556, 2010, Accessed: 00, 2020. [Online]. Available: