Using poly(styrene-co-maleic anhydride) as the backbone and poly(ethylene glycol) methyl ether as side chains

three kinds of comblike polymers of different side chain length were synthesized.The Lisalt complexes and their films were prepared.The dynamic mechanical properties were investigated.It was found that the main chain was rigid and the side chain was flexible in this comblike polymer system. Based on the time temperature equivalence principle

a master curve was constructed.By selecting Tα as reference temperature

Arrhenius plotrs of shift factor and iso-free-volume polts were attained.The values of WLF parameters C1 and C2 increase with increasing salt concentration. By reference to T0=50℃

the relation between the average relaxation time lgτn and Mw of side chains is also linear. And the master curves are movable with the change of salts.It shows the effect of different kinds of salt on relaxation time.