Grafted copolymer and preparation method thereof and layer-by-layer decorative materials

The invention provides grafted copolymer which is provided with a structure represented by the formula (1) or the formula (II). The grafted copolymer has good water solubility and good electrochemistry response characteristics due to the fact that the grafted copolymer is provided with electroactive aniline oligomer segments. Prepared grafted copolymer is adsorbed to the surfaces of materials which are subjected to preprocessing layer by layer so as to obtain the layer-by-layer decorative materials which have an adjustable composite layer number and good electroactivity. The layer-by-layer decorative materials, used as biomedical polymer materials, can be better applied to the field of tissue engineering like artificial organs or tissue repair representing by the formula (1) or the formula (II).