Comb-shaped stem grafting copolymer containing reactive group and preparation method and application thereof

The invention discloses a comb-shaped stem grafting copolymer containing reactive group and a preparation method and application thereof. The copolymer is a comb-shaped stem grafting copolymer by taking small molecule monomer B as the main chain, and giant molecule monomer A as the side chain. According to the method, the giant molecule monomer A and the small molecule monomer B are copolymerized to form the comb-shaped stem grafting copolymer of which the main chain is the small molecule monomer B and the side chain is the giant molecule monomer A. The comb-shaped stem grafting copolymer disclosed by the invention can serve as the chain extender of a polymer or a polymer blend, the compatibilizer of the polymer blend, the hydrolytic stabilizer, adhesive and anti-leakage agent of the polymer blend, and is used for coatings of wood, metal or plastic. The reactive group in the copolymer has very high reaction activity, and can react with various end groups of polyamide and polyester. Methacrylate monomers have thermodynamics compatibility with various polymers. The reactive group can react with the end hydroxyl group or the end carboxy group of polyester, so that the comb-shaped stem grafting copolymer can serve as the chain extender, and the processing and application properties of the material are improved.