Disclosed in the present invention is a benzocrown ether graft polymer with a lithium isotopic separation effect and a preparation method thereof. The polymer is a benzocrown ether graft polymer formed by the linkage of chemical bonds, which takes the main chain of a polymer containing chloromethyl group, chloroformyl group or hydroxyl group as main chain, and takes a benzocrown ether as pendant group. The preparation process of the polymer comprises the following steps: preparing polymer solution with certain concentration by dissolving a polymer containing chloromethyl group, chloroformyl group or hydroxyl group in a solvent; then blending a catalyst and a benzocrown ether containing carboxyl group or aldehydyl group and dissolving in the polymer solution containing hydroxyl group, or blending an acid-binding agent and a benzocrown ether containing amino group or hydroxyl group and dissolving in the polymer solution containing chloromethyl group or chloroformyl group, reacting at a certain temperature and for a certain time, linking the benzocrown ether to the main chain of polymer by chemical bonds, and precipitating by adding a precipitating agent to obtain the graft polymer. The grafting polymer has excellent characteristic of lithium isotopic separation.
本发明揭示了一种具有
锂同位素分离效应的苯并
冠醚嫁接聚合物及其制备方法。该聚合物是由
化学键连接形成的苯并
冠醚嫁接聚合物,其以含
氯甲基基团、
氯甲酰基团或羟基基团为主链的聚合物为主链,并以苯并
冠醚为挂链基团。聚合物的制备过程包括以下步骤:通过在溶剂中溶解含有
氯甲基基团、
氯甲酰基团或羟基基团的聚合物,制备一定浓度的聚合物溶液;然后将催化剂和含有羧基或醛基的苯并
冠醚混合并溶解于含有羟基的聚合物溶液中,或将酸中和剂和含有
氨基或羟基的苯并
冠醚混合并溶解于含有
氯甲基或
氯甲酰基的聚合物溶液中,在一定温度和时间下反应,通过
化学键将苯并
冠醚连接到聚合物的主链上,并通过加入沉淀剂使其沉淀,以获得嫁接聚合物。该嫁接聚合物具有优异的
锂同位素分离特性。