SOLVATOCHROMIC PROPERTIES OF POLY[3-(6-METHOXYHEXYL)-2,5-THIENYLENE] IN DIFFERENT SOLVENT MIXTURES

Two samples of poly [3-(6-methoxyhexyl)-2,5-thienylene] with a slight difference in regioregularity and a greater difference in molecular we ights were obtained by chemical oxidation with FeCl3. The solvatochrom ism of the two polymers was investigated in mixtures of various solven ts (dioxane, dimethylpropyleneurea, methylene chloride, tetrahydrofura n, chloroform and toluene) with different non-solvent (methanol) molar fractions, at constant polymer concentration and temperature. Some so lvent/non-solvent couples were able to distinguish between the two sam ples, giving a different solvatochromic effect. This can be considered a very useful tool to characterize polymers with configurational and molecular weight differences. (C) 1997 Elsevier Science S.A.