A Simulation Study on Dynamics of Dendrimer-Polymer Conjugates

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• 作者：Tong Zhou ; Shing Bor Chen
• 刊名：Macromolecules
• 出版年：2006
• 出版时间：September 19, 2006
• 年：2006
• 卷：39
• 期：19
• 页码：6686 - 6692
• 全文大小：105K
• 年卷期：v.39,no.19(September 19, 2006)
• ISSN：1520-5835

文摘

Brownian dynamics simulation is conducted to investigate the dynamics of dendrimer-polymerconjugates on the basis of a coarse-grained bead-spring model. The grafted polymers are found to slow theglobal dynamics of the dendrimer core. Because of the structural difference between the two moieties, thetranslational and rotational diffusivities of a conjugate show different scaling behaviors from those for a dendrimer,but in principle follow a Stokes-Einstein fashion, analogous to polymers of other types. When the grafted chainsare long enough, they become brushlike, evidenced by the scaling behavior of the end-to-end distance as well asthe chain-length dependence of the rotational relaxation time. For the range of chain length investigated, it isfound that the brushlike grafted polymers still fall within the dilute regime. Thereby the interchain interactionsare not strong enough to render a change in the scaling behavior of rotation relaxation in comparison with anisolated rodlike polymer.