Relaxation of copolymeric dendrimers built from alternating monomers

被引:11
|
作者
Satmarel, C
Gurtovenko, AA
Blumen, A
机构
[1] Univ Freiburg, D-79104 Freiburg, Germany
[2] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
[3] Aalto Univ, Phys Lab, FIN-02015 Helsinki, Finland
[4] Aalto Univ, Inst Phys, FIN-02015 Helsinki, Finland
关键词
copolymers; dendrimers; generalized Gaussian structures; relaxation; theoretical-analytical modeling;
D O I
10.1002/mats.200400020
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In this study we extend our previous work concerning the Rouse dynamics of linear alternating copolymers (Macromolecules 2003, 36, 486) to tree-like structures and focus on copolymeric dendrimers built from monomers of two kinds A and B; as before, we let the monomers differ in their interaction with the solvent. In the framework of generalized Gaussian structures (GGS), we consider alternating arrangements of monomers over the dendritic structures. We develop a semi-analytical method to determine for such structures (of arbitrary functionality, f, and number of generations, g), the eigenfrequencies (relaxation times). The method allows us to compute readily the storage, [G′(ω)] and the loss, [G″(ω)] moduli. These quantities show a multitude of features which mainly depend on the difference in the mobilities, or, equivalently, in the friction coefficients ζA and ζB of the A- and B-beads. These features range from the presence of large plateau-type regions in [G′(ω)] to the appearance of double-peaks in [G″(ω)]. In contrast to linear alternating copolymers, the behavior of the dynamic moduli of copolymeric systems with dendritic topology can shed light into their composition, i.e. into the relative numbers of A- and B-beads. We discuss these aspects in view of their experimental relevance.
引用
收藏
页码:487 / 496
页数:10
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