Abstract

VISCOMETRIC STUDY OF CARBOXYMETHYLATED OLIGOIMIDES.

Dr. S.V.Patel*

Abstract

Various Amino terminated oligoimides were prepared by reported method. Bismaleimide and Diaminediphenylmethane at different molar ratios were carried out. The carboxymethylation of this oligoimides was claimed out by their reaction with monochloro acetic acid. The resultant carboxymethylated oligoimides (CMOIs) were characterized. The viscosity measurement of solutions of all CMOIs was calmed out in DMF at 30o ± 0.3oC. The ubbelohde suspended type viscometer was used for such measurement. The viscosity data of the solution of CMOI signified that the decrease in concentration of solution increases reduced viscosity (ɳred). This suggests the CMOI act as polyelectrolyte of anionic type. Thus the viscosity of the solution in DMF suppressed by adding water and KBr in DMF. Thus the viscosity measurements of solution of CMOI in DMF-Water-KBr (80:20:1%) gives the intrinsic viscosity. Also applying empirical equation is able to represent the viscometric data for all the oligoimides. It may be stated that as the equation is quite empirical.

Keywords: Polyelectrolyte, Oligoimides, Ubbelohde viscometer, reduced viscosity, empirical relation and intrinsic viscosity.