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首页> 外文期刊>Macromolecular symposia >Polymerization of 1,3-Butadiene with Several Catalytic Systems Based on Neodymium or Lithium in Presence of Ionic Liquids
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Polymerization of 1,3-Butadiene with Several Catalytic Systems Based on Neodymium or Lithium in Presence of Ionic Liquids

机译:离子液体存在下基于钕或锂的几种催化体系聚合1,3-丁二烯

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摘要

The anionic and Ziegler-Natta polymerizations of 1,3-butadiene initiated with n-BuLi and NdV/TIBA/DEAC respectively were carried out in presence of ionic liquids and cyclohexane as solvent in both cases. Polybutadienes obtained were characterized by SEC, NMR and DSC techniques and results were compared with polybutadienes synthesized under similar conditions but in absence of ionic liquids. In all cases, the presence of ionic liquids caused a decrease in the reaction exothermal and also a diminution in the molecular weight distribution. The ionic liquids increased the microstructure cis-1,4 in both kind of polymerizations, and promotes a shift towards lower temperatures in the glass-transition temperature.
机译:在两种情况下,分别在离子液体和环己烷作为溶剂存在下,分别用n-BuLi和NdV / TIBA / DEAC引发的1,3-丁二烯的阴离子和Ziegler-Natta聚合反应。通过SEC,NMR和DSC技术对获得的聚丁二烯进行表征,并将结果与​​在类似条件下但不存在离子液体的情况下合成的聚丁二烯进行比较。在所有情况下,离子液体的存在都会引起反应放热的降低,以及分子量分布的减小。离子液体在两种聚合反应中均增加了微观结构cis-1,4,并促进了玻璃化转变温度向较低温度的转变。

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