Copolymer based on environmental response and preparation method thereof

The invention relates to a copolymer based on environmental response and a preparation method thereof, wherein the copolymer has specific three blocks which are sequentially a hydrophobic block, a hydrophilic environmental response block and a ploy-N-methylacryloyl succinimide (PNAS) chain with reactivity. The preparation method of the copolymer comprises the following steps of: connecting the hydrophobic block with a micromolecular chain transfer agent to prepare a macroinitiator; performing primary polymerization on the hydrophilic environmental response block and the macroinitiator; and performing secondary polymerization on an N-methylacryloyl succinimide (NAS) monomer and a product of the first step, so as to obtain the copolymer based on environmental response. The copolymer has the advantages that the copolymer based on environmental response has a controllable structure, and the hydrophobic block, the hydrophilic environmental response block and the PNAS chain are independent from one another; and the copolymer based on environmental response has a clear specific structure, and can fully play the performances of all the chain segments.