Poly[5,
-7,7'-diylethylene] (MQE) has been prepared by Friedel Craft polycondensation of 5,5'-methylene-bis(8-hydroxyquinoline) (MBQ) with 1,2-dichloroethane and ethylene glycol in the presence of an acid catalyst under various experimental conditions. Polymer reactions such as bydroxyethylation, carboxymethylation and methylation of one polymer sample were carried out with a view to investigating the effect of these reactions on the properties of the polymer. The polymer samples and the products of methylation (M-MQE) and carboxymethylation (C-MQE) are insoluble in all solvents, except formic acid. A polymer similar in structure to C-MQE was prepared by Friedel-Craft condensation of a carboxymethylated derivative of MBQ with ethyleneglycol. The hydroxyethylated product of polymer sample (MQE-2) is soluble even in DMF and is highly soluble in pyridine. The polymer samples were characterized by i.r. and u.v., estimation of molecular mass, by non-aqueous conductometric titration and solution viscometric study in formic acid and in aqueous sulphuric acid. Various empirical relations were applied to correlate appropriate viscosity parameters with concentration of solution.