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RAFT Miniemulsion Polymerization Kinetics, 2-Molecular Weight Distribution

机译:RAFT微乳液聚合动力学,2分子量分布

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The molecular weight distribution formed in a RAFT polymerization conducted inside submicron particles (D-P < 300 nm) is considered. For small particles, the MWD at low to middle conversion might be rather broad because of the large differences in MWDs formed in different polymer particles. Such a broad MWD can be made narrower by increasing the radical entry frequency. On the other hand, larger frequencies of radical entry result in a broader MWD at the final conversion levels. The number of dead polymer chains increases with time, and the dead polymer peak could be observed in the MWD at a prolonged aging time. According to this theoretical investigation, smaller particles are advantageous in implementing a faster polymerization rate, a narrower MWD, and a smaller number of dead polymer molecules.
机译:考虑在亚微米颗粒内部进行的RAFT聚合中形成的分子量分布(D-P <300nm)。对于小颗粒,由于在不同的聚合物颗粒中形成的MWD差异很大,因此低至中等转化率的MWD可能相当宽。通过增加激进进入频率,可以使如此宽的MWD变得更窄。另一方面,自由基进入的频率越高,最终转化水平上的MWD范围就越大。失效的聚合物链的数量随时间增加,并且在延长的老化时间下,MWD中会观察到失效的聚合物峰。根据该理论研究,较小的颗粒有利于实现更快的聚合速率,更窄的MWD和更少的死聚合物分子。

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