用~(13)C-NMR 方法测定了稀土顺丁二烯和聚异戊二烯链端结构及序列结构,从链端结构推测的聚合活性链端结构与前文是一致的。在聚异戊二烯中存在着“头-头”和“尾-尾”结构,这种结构引起活性链端甲基位置的改变,从而解释了稀土异戊二烯中3,4-链节的形成。测定了不同聚合温度对聚合物中顺、反结构含量的影响,可用活性链端的 anti-syn异构化加以解释。 The chain end structures and sequence structures of rare earth butadiene and polyisoprene were determined by ~ (13) C-NMR. The structure of the chain terminals was in agreement with the previous one. There is a “head-head” and “tail-tail” structure in polyisoprene, which results in a change in the position of the methyl group at the end of the active chain, thereby explaining that 3,4-linkages in the rare earth isoprene Formation. The influence of different polymerization temperature on the cis and trans structure content of the polymer was measured and can be explained by the anti-syn isomerization of the active chain end.