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Halide-free neodymium phosphate based catalyst for highly cis-1,4 selective polymerization of dienes

机译:不含卤化物的磷酸钕基催化剂,用于二烯的高度顺式1,4选择性聚合

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Neodymium-based Ziegler–Natta type catalytic systems are known to produce polydienes with high cis -1,4 content. It is generally believed that in Ziegler–Natta catalytic systems, a halide or pseudohalide, whether in the catalyst itself or a separate source, is required for the success of the polymerization. In this work, we have synthesized an unusual halide-free neodymium diethyl phosphate catalyst for diene polymerization. This neodymium complex combined with triisobutylaluminum (TIBA), formed a binary catalytic system and was used to polymerize β-myrcene. The catalytic system displays high stereospecificity and produces poly(β-myrcene) with 96% cis -1,4 content and a relatively narrow molecular weight distribution ( M _(w) / M _(n) = 1.80). Also, kinetic studies indicated the catalytic system gives a pseudo-living polymerization. The block copolymer poly(β-myrcene)- b -poly(isoprene) was successfully synthesized by sequential monomer addition, further demonstrating the pseudo-living nature of polymerization with the neodymium diethyl phosphate catalyst.
机译:已知基于钕的Ziegler-Natta型催化体系可生产高-1,4顺式聚二烯。人们普遍认为,在齐格勒-纳塔催化体系中,无论是在催化剂本身中还是在单独的来源中,卤化物或拟卤化物都是成功聚合所必需的。在这项工作中,我们合成了一种不常见的不含卤化物的二乙基磷酸钕钕催化剂,用于二烯聚合。该钕配合物与三异丁基铝(TIBA)结合形成二元催化体系,并用于聚合β-月桂烯。催化体系显示出高的立体定向性,并产生具有96%顺式-1,4含量和相对窄的分子量分布(M _(w)/ M _(n)= 1.80)的聚(β-月桂烯)。同样,动力学研究表明该催化体系产生了假活性聚合。通过顺序加入单体成功地合成了嵌段共聚物聚(β-月桂烯)-b-聚(异戊二烯),进一步证明了用磷酸二乙基钕催化剂聚合的假活性。

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