Multi-block thermoplastic elastomer and preparation method thereof

The invention discloses a multi-block thermoplastic elastomer and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a poly-chain transfer agent PCTA, a first reaction monomer, an initiator and a solvent, discharging water and air in a system, heating, reacting, precipitating a product in a precipitating agent, collecting, and drying to obtain a chain transfer agent; the poly-chain transfer agent PCTA has the following structural formula: uniformly mixing a chain transfer agent, a second reaction monomer, an initiator and a solvent, removing water and air in the system, heating and reacting, and after the reaction is finished, collecting a product and drying to obtain the multi-block thermoplastic elastomer. The multi-block thermoplastic elastomer provided by the invention has excellent mechanical properties. 本发明公开了一种多嵌段热塑性弹性体及其制备方法，所述制备方法包括：将聚链转移剂PCTA、第一反应单体、引发剂与溶剂混合均匀，排出体系中的水和空气，升温后反应，将产物在沉淀剂中沉淀并收集，干燥得到链转移剂；聚链转移剂PCTA的结构式如下：将链转移剂、第二反应单体、引发剂与溶剂混合均匀，排除体系中的水和空气，