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首页> 外文期刊>Macromolecular theory and simulations >Termination rate coefficients derived from PLP-SEC data
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Termination rate coefficients derived from PLP-SEC data

机译：从PLP-SEC数据得出的终接率系数

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A novel procedure is outlined by which the termination rate coefficient, k(t), may be deduced from molecular weight and monomer conversion data of pulsed laser polymerization (PLP) - size exclusion chromatography (SEC) experiments. For this k(t) analysis only the central part of the molecular weight distribution (MWD) between the first point of inflection (POI), that is also used for k(p) analysis, and the third such POI is taken into account. Within this region a characteristic ratio of areas under the MWD is fitted either by using PREDICI or by applying a lumping scheme method. The success of the lumping scheme procedure is demonstrated for the bulk polymerization of butyl methacrylate. The k(t) values derived by this method refer to small initial degrees of monomer conversion as are typical of PLP-SEC investigations. The relatively fast and efficient lumping scheme technique is restricted to situations where k(t) may be considered independent of chain length and where chain transfer processes are not important. [References: 22]
机译：概述了一种新的方法，通过该方法可以从脉冲激光聚合（PLP）-尺寸排阻色谱（SEC）实验的分子量和单体转化数据推导终止速率系数k（t）。对于此k（t）分析，仅考虑第一个拐点（POI）（也用于k（p）分析）和第三个此类POI之间的分子量分布（MWD）的中心部分。在该区域内，通过使用PREDICI或通过采用集总方案方法来拟合MWD下面积的特征比。对于甲基丙烯酸丁酯的本体聚合，证明了集总方案程序的成功。通过该方法得出的k（t）值代表单体转化率的较小初始程度，这是PLP-SEC研究的典型结果。相对快速和有效的集总方案技术限于k（t）可以独立于链长且链转移过程不重要的情况。 [参考：22]

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