Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic.
J Chromatogr A. 2012 Oct 19;1260:97-101. doi: 10.1016/j.chroma.2012.08.055. Epub 2012 Aug 23.
The SEC separation of a randomly branched polymer, in particular local dispersity due to branching, are theoretically examined. A model of the SEC separation of randomly branched polymer with tetrafunctional branch points enabling the estimation of local dispersity was developed. Measurable quantities (branching indices) were compared with real data. Local dispersity due to branching is demonstrated to depend on elution volume and degree of branching and in the area of the beginning of the elution curve it can reach non-negligible values.
本文从理论上研究了随机支化聚合物的 SEC 分离，特别是由于支化引起的局部分散度。建立了具有四官能支化点的随机支化聚合物 SEC 分离模型，可用于估计局部分散度。将可测量的量（支化指数）与实际数据进行了比较。结果表明，支化引起的局部分散度取决于洗脱体积和支化度，在洗脱曲线起始处，其值可能达到不可忽略的程度。
