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Mean Span Dimensions of Ideal Polymer Chains Containing Branches and Rings
作者:Yanwei Wang, Iwao Teraoka, Flemming Y. Hansen, Günther H. Peters, Ole Hassager
关键字:平均跨度,高斯链,支化链,环形链,体积排除色谱
论文来源:期刊
具体来源:Macromolecules
发表时间:2011年
We present a general method for calculating the mean span dimension of various branched and ringed polymers under the assumption of Gaussian chain statistics. The method allows a routine construction of an integral expression of the mean span dimension based on three base functions, determined for a connector, an arm and a loop, respectively. Applications of our method are shown to a variety of polymer architectures including star, two-branch-point, comb and various cyclic chains (eight-shaped, Θ-shaped and several semicyclic chains). Comparing the mean span dimension with other commonly used molecular size parameters—the radius of gyration and the hydrodynamic radius, it is found that both the mean span dimension and the hydrodynamic radius shrink less than does the radius of gyration when comparing averaged sizes of a branched chain with its linear analogue. Finally, possible use of the mean span dimension in size exclusion chromatography (SEC) experiments is discussed.