Dependence of color change of vinylethylene carbonate copolymers having N-substituted maleimides on chemical structure by acid-base switching in solution and solid state

The copolymers of vinylethylen carbonate (VEC) and N-substituted maleimides (NMI) exhibited drastic color change based on the acid-base switching in solution and solid state, although the copolymers of VEC and styrene barely exhibited such color change.501