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首页> 外文期刊>Macromolecular theory and simulations >Copolymer Composition Deviations from Mayo–Lewis Conventional Free Radical Behavior in Nitroxide Mediated Copolymerization
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Copolymer Composition Deviations from Mayo–Lewis Conventional Free Radical Behavior in Nitroxide Mediated Copolymerization

机译:在一氧化氮介导的共聚反应中,Mayo-Lewis常规自由基行为对共聚物成分的影响

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摘要

The validity of the Mayo-Lewis (ML) terminal model for copolymer composition in nitroxide mediated copolymerization is systematically tested by simulation. Significant deviations in copolymer composition from ML behavior occur under various parameter combinations before the nitroxide quasi-equilibrium condition (QEC) is reached. Maximum deviations are usually below 5 pp, and absent at conversions higher than 3%, but after 10% in some cases. High reactivity ratios lead to larger deviations; low reactivity ratios (faster cross-propagation) produce nearML behavior. An additional continuous radical source leads to faster attainment of the QEC and reduces the deviations from ML behavior.
机译:通过模拟系统地测试了Mayo-Lewis(ML)末端模型在硝基氧介导的共聚中的共聚物组成的有效性。在达到氮氧化物准平衡条件(QEC)之前,在各种参数组合下,共聚物组成与ML行为之间存在明显偏差。最大偏差通常在5 pp以下,并且在高于3%的转化率时不存在,但在某些情况下则为10%。高反应率导致更大的偏差;低的反应率(更快的交叉传播)会产生NearML行为。额外的连续自由基来源可以更快地实现QEC,并减少与ML行为的偏差。

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