Influence of polydispersity on the dynamic structure factor of macromolecules in dilute solution

被引：18

作者：

Harnau, L ^{[1
]}

Winkler, RG ^{[1
]}

Reineker, P ^{[1
]}

机构：

[1] Univ Ulm, Theoret Phys Abt, D-89069 Ulm, Germany

来源：

MACROMOLECULES | 1999年 / 32卷 / 18期

关键词：

D O I：

10.1021/ma990450f

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The influence of polydispersity on the dynamic structure factor of macromolecules in dilute solution is investigated. Analytical expressions are derived for the translational diffusion coefficient. It is found that the translational diffusion coefficient is less influenced by polydispersity than the mean square radius of gyration. Moreover, the shape of the dynamic structure factor at various scattering vectors is investigated. For a polydisperse macromolecular solution the dynamic structure factor is not a single-exponential function at small scattering vectors. The first cumulant of the dynamic structure factor is compared with dynamic light scattering measurements on polydisperse polysaccharides in dilute solution. Our theoretical calculations agree well with experimental data.

引用

页码：5956 / 5960

页数：5

共 27 条

[1] INTERPRETATION OF DYNAMIC SCATTERING FROM POLYMER-SOLUTIONS [J].