Theory of multiple-detection size-exclusion chromatography of complex branched polymers
Theory of multiple-detection size-exclusion chromatography of complex branched polymers
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DOI：
10.1002/mats.200600046
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发表时间：
2007-01-16
影响因子：
1.4
通讯作者：
Castignolles, Patrice
中科院分区：
文献类型：
--
作者：
Gaborieau, Marianne;Gilbert, Robert G.;Castignolles, Patrice
SEC通过流体力学体积而不是分子量或支化特性来分离复杂的支化聚合物。通过定义分布函数N‘(M，V-h)、具有分子质量M的链数和流体动力学体积V-h，导出了包括带宽化在内的与不同类型探测器响应有关的方程。尽管无论使用何种检测器，SEC都无法确定复杂聚合物的真实分子量分布，但这种形式使多重检测SEC数据能够被处理，以分析聚合物样品并揭示有关聚合物合成的机理信息。该公式还说明了如何通过对流体动力学体积分布的正确处理来获得真实的重量和数均分子量，即(M)相对于bar(W)和(M)相对于bar(N)。
SEC separates complex branched polymers by hydrodynamic volume, rather than by molecular weight or branching characteristics. Equations relating the response of different types of detectors are derived including band broadening, by defining a distribution function N'(M,V-h), the number of chains with molecular weight M and hydrodynamic volume V-h. While the true molecular weight distribution of complex polymers cannot be determined by SEC, irrespective of the detector used, the formalism enables multiple detection SEC data to be processed to both analyze the polymer sample and reveal mechanistic information about polymer synthesis. The formalism also shows how the true weight- and number-average molecular weight, (M) over bar (w) and (M) over bar (n), can be obtained from correct processing of the hydrodynamic volume distributions.