Fractal aggregate model of sedimenting macromolecules

被引:7
作者
Gmachowski, L
机构
[1] Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland
[2] Warsaw Univ Technol, Inst Chem, PL-09400 Plock, Poland
关键词
model aggregate; blob mass; chain concentration;
D O I
10.1016/j.polymer.2005.08.041
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 dissolved macromolecules are represented by fractal aggregates of the same mass and hydrodynamic properties, composed of solid particles. The model presented gives the relation between sedimentation coefficient of an individual coil and that for the semidilute solution if the coil and blobs can be modeled by the same fractal aggregate. Using this model the sedimentation coefficient of an individual macromolecule is recalculated into the sedimentation coefficient of semidilute solution. The sedimentation coefficients are then compared by plotting them against the mass of object under consideration (macromolecule or blobs). The points for individual coils are situated lower. This incompatibility is analyzed in terms of the coil size reduction with concentration in the dilute region. The reduction of coil size corresponds to the increase of the size of non-porous particles forming the equivalent aggregate. In a good solvent such contraction can be also possible by reduction of the excluded volume exponent. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:10443 / 10449
页数:7
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