Lightscattering and Viscosities Measurements of Dilute Solutions of Some Schiff Base Polymers

 Summary: Three Schiff base polymers polymethylene-bis(salicylaldehyde)tetramethylethlene-diimine (PMSATen), polymethylene-bis(salicylaldehyde)meso-stillbenediimine(meso-PMSAS) and poly-methylene-bis(2-hydroxyacetophenone)1,2-propylenediimine (PMHAPn) were prepared and  indicated refractive index increments (dn/dc) within 0.223-0.241 at 436 nm and 0.155-0.130 at 546 nm. The data for dn/dc was obtained by extrapolating intercept of plot  ?n/c against concentration  to zero concentration. The values of Hc/τ (τ = turbidity) were plotted against concentration and reciprocal of the intercept at zero concentration gave the molecular weight in the range of 58100-66890.The polymers were examined for reduced, intrinsic, inherent and absolute viscosities. Thermodynamic parameters as energy of activation (?Gv), heat of activation (?Hv) and entropy of activation (?Sv) of viscous flow were calculated at different temperatures

KHALIDA PARVEEN MAHAR ,MUHAMMAD SALEM KHAN ,MUHAMMAD YAR KHUHAWAR ,SUBHAN ALI MAJIDANO ,ABDUL HAMID CHANNAR ,