Topological separation of linear and star-shaped polystyrenes by off-line 2D chromatography. Stars having high molar mass arms and quantification of the star fraction
Topological separation of linear and star-shaped polystyrenes by off-line 2D chromatography. Stars having high molar mass arms and quantification of the star fraction
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DOI：
10.1016/j.polymer.2005.07.038
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发表时间：
2005-10-24
期刊：
影响因子：
4.6
通讯作者：
Radke, W
中科院分区：
文献类型：
--
作者：
Gerber, J;Radke, W
21) 使用温度梯度相互作用色谱 (TGIC) 作为第一维、SEC 作为第二维对线性和星形聚合物的混合物进行离线分离。实验结果表明，臂摩尔质量高达 42,000 g/mol 时，线性结构和星形结构清晰分离。分辨率几乎与臂的摩尔质量无关，仅取决于星臂的数量。从二维色谱图中可以确定第一个分支结构（即三臂星形结构）的摩尔质量。相对峰体积的评估可以可靠地估计复杂混合物中支化结构的数量。 (c) 2005 Elsevier Ltd. 保留所有权利。
Off-line 21) separations on mixtures of linear and star-shaped polymers were performed using temperature gradient interaction chromatography (TGIC) as a first and SEC as a second dimension. The experiments resulted in clear separations of the linear and star shaped-structures for arm molar masses up to 42,000 g/mol. The resolution is nearly independent of the molar masses of the arms and depends only on the number of star arms. From the 2D chromatograms it is possible to determine the molar mass of the first branched structure, i.e. the three arm star. The evaluation of the relative peak volume allows a reliable estimation of the amount of branched structures in the complex mixture. (c) 2005 Elsevier Ltd. All rights reserved.