利用高温二维液相色谱对功能化聚烯烃进行表征

Characterization of Functionalized Polyolefins by High-Temperature Two-Dimensional Liquid Chromatography

二维液相色谱(2D-LC)提供了合成聚合物和生物聚合物分子异质性的不同方面的信息。聚烯烃材料的2D-LC分析需要高温,但聚烯烃的高温二维液相色谱(HT-2D-LC)分析条件却未见报道。通过高温相互作用液相色谱系统(根据分析物分子化学成分的差异进行分离)和体积排阻色谱(SEC)(根据分析物分子摩尔质量的不同进行分离)的联用,乙烯-乙酸乙烯酯共聚物的完整HT-2D-LC分离第一次得以实现。

Two-dimensional liquid chromatography （2D-LC） provides information on the different aspects of molecular heterogeneity of synthetic and biological polymers. The 2D-LC of polyolefin materials, however, requires the use of elevated temperatures. The conditions for high-temperature 2D-LC （HT-2D-LC） of polyolefins have not yet been published. By coupling the high-temperature interactive liquid chromatography system （in which the molecules are distinguished with respect to chemical composition） with size exclusion chromatography （SEC） （where the molecules are separated according to the differences in molar masses）, comprehensive HT-2D-LC separation of ethylene-vinyl acetate copolymers was performed for the first time.