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首页> 外文期刊>Macromolecules >MOLECULAR WEIGHT DISTRIBUTION IN FREE-RADICAL POLYMERIZATION WITH CHAIN-LENGTH-DEPENDENT BIMOLECULAR TERMINATION .2. EMULSION POLYMERIZATION
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MOLECULAR WEIGHT DISTRIBUTION IN FREE-RADICAL POLYMERIZATION WITH CHAIN-LENGTH-DEPENDENT BIMOLECULAR TERMINATION .2. EMULSION POLYMERIZATION

机译:链长依赖双末端终止的自由基聚合中的分子量分布2。乳液聚合

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The loci of polymerization in usual emulsion polymerizations are the polymer particles whose diameters are in the submicrometer range; therefore, each polymer particle can be considered a segregated microreactor that contains a small number of macroradicals. It is straightforward to extend the microreactor method proposed in Part 1 of this series(1) to emulsion polymerizations by taking account of the transfer processes of oligomeric radicals between phases, and as a consequence, the formation process of each polymer molecule is simulated directly. The molecular weight distribution can be significantly different from those predicted using a single constant bimolecular termination rate coefficient. The average termination rate coefficient is smaller for larger polymer particles or for longer time intervals between radical entry. Monte Carlo simulations promise to provide greater insight into the complex molecular processes that occur during emulsion polymerizations. [References: 21]
机译:常规乳液聚合中的聚合位点是直径在亚微米范围内的聚合物颗粒。因此,每个聚合物颗粒都可以被认为是包含少量大分子自由基的分离微反应器。通过考虑各相之间低聚自由基的转移过程,可以很容易地将本系列(1)的第1部分中提出的微反应器方法扩展到乳液聚合,因此,可以直接模拟每个聚合物分子的形成过程。分子量分布可能与使用单个恒定双分子终止速率系数预测的分子量分布明显不同。对于较大的聚合物颗粒或自由基进入之间的较长时间间隔,平均终止速率系数较小。蒙特卡洛模拟有望为乳液聚合过程中发生的复杂分子过程提供更深入的了解。 [参考:21]

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