(3). Two maleimide derivatives are suggested for the chemical modification, N-(phenyl amino) maleimide and 4-nitro(phenyl amino) maleimide, The latter led to higher yield percentage,
underthesameconditions,thantheformer.Thisisattributed [18]H.Warth,R.Mu ̈lhaupt,J.Scha ̈tzle.,J.Appl.Polym.Sci.64(2)(1997)231–242.
to the effect of nitro group on the ionization of (N H) bond
which facilitates the chemical modification.
(4). The structures of the modified polymeric samples are con-