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Continuous Production of Multiblock Copolymers in a Loop Reactor: When Living Polymerization Meets Flow Chemistry
Macromolecules ( IF 5.5 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1021/acs.macromol.7b01662
Erlita Mastan 1 , Junpo He 1
Affiliation  

A continuous process for the production of multiblock polymers via living anionic polymerization in a loop reactor is proposed by kinetic modeling. The process utilizes specific configurations of the loop reactors and feed inlets, thus producing multiblock polymers constituted by a blend of chains with varying number of blocks. The dependence of the product molecular parameters, such as length, composition of each block, and the block number distribution, on the residence time and the recirculation fraction is analyzed by numerical integration of differential mass balances. This dependence is subsequently translated into controllability of molecular parameters by changing the operation conditions such as the recirculation and inlet flow rates. In general, higher recirculation flow rate yields products with shorter block length but larger fraction of polymers possessing higher number of blocks and more significant compositional mixing in each block. An increase in the feed flow rates also increases the compositional mixing but gives longer block length with lower fraction of polymers possessing a higher number of blocks. While being discussed in terms of living anionic copolymerization of styrene and butadiene, the present strategy can be extended to any other living copolymerization of suitable monomer pairs, thus highlighting the use of reaction engineering to control the polymer structures.

中文翻译:

在环管反应器中连续生产多嵌段共聚物:当活性聚合遇到流动化学时

通过动力学建模,提出了一种在环管反应器中通过活性阴离子聚合生产多嵌段聚合物的连续方法。该方法利用了回路反应器和进料口的特定构造,因此产生了由具有不同数目的嵌段的链的共混物构成的多嵌段聚合物。通过差分质量平衡的数值积分,分析了产物分子参数(如长度,每个嵌段的组成和嵌段数分布)对停留时间和再循环分数的依赖性。通过改变操作条件,例如再循环和入口流速,这种依赖性随后转化为分子参数的可控制性。一般来说,较高的再循环流速产生的产物具有较短的嵌段长度,但是较大部分的聚合物具有较高的嵌段数,并且每个嵌段中的成分混合更为显着。进料流速的增加也增加了组分的混合,但是给出了更长的嵌段长度,而具有较高数目的嵌段的较低比例的聚合物。尽管就苯乙烯和丁二烯的活性阴离子共聚而言进行了讨论,但是本发明的策略可以扩展到合适的单体对的任何其他活性共聚,因此强调了使用反应工程来控制聚合物结构。进料流速的增加也增加了组分的混合,但是给出了更长的嵌段长度,而具有较高数目的嵌段的较低比例的聚合物。尽管就苯乙烯和丁二烯的活性阴离子共聚而言进行了讨论,但是本发明的策略可以扩展到合适的单体对的任何其他活性共聚,因此强调了使用反应工程来控制聚合物结构。进料流速的增加也增加了组分的混合,但是给出了更长的嵌段长度,而具有较高数目的嵌段的较低比例的聚合物。尽管就苯乙烯和丁二烯的活性阴离子共聚而言进行了讨论,但是本发明的策略可以扩展到合适的单体对的任何其他活性共聚,因此强调了使用反应工程来控制聚合物结构。
更新日期:2017-11-21
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