Jump to main content
Jump to site search

Issue 9, 2011
Previous Article Next Article

Equilibrium chain exchange kinetics in block copolymer micelle solutions by dissipative particle dynamics simulations

Author affiliations

Abstract

The kinetics of chain exchange between diblock copolymer micelles in solution at equilibrium were studied by dissipative particle dynamics simulation. We performed hybridization simulations for A2B3 or A4Bx (x = 4, 6, 8) micelle solutions in which approximately half of all micelles and free chains were initially colored and chain exchange between micelles was monitored by analyzing the time-dependent fraction of colored chains in aggregates. We found that in all cases the chain exchange is dominated by chain (or small aggregate) expulsion and follows a first-order kinetic process with the characteristic time, τ, increasing exponentially with core block length, NA and interaction parameter between blocks, χAB as τ ≈ exp (0.67χABNA). We determined that chain exchange between micelles does not depend on concentration but occurs via several kinetic mechanisms: unimer expulsion/insertion, small aggregate fragmentation/merging and unequal size micelle fission/fusion, which all exhibit very similar relaxation times. Chain exchange between micelles in A4Bx micelle solutions is found to occur more rapidly for diblock copolymers with a longer corona-block length, as the area per chain and critical micelle concentration are larger (while micelle size and critical micelle temperature are lower) in this case, implying a lower potential barrier for chain (or small aggregate) expulsion from micelles.

Graphical abstract: Equilibrium chain exchange kinetics in block copolymer micelle solutions by dissipative particle dynamics simulations

Back to tab navigation

Supplementary files

Article information


Submitted
08 Dec 2010
Accepted
10 Feb 2011
First published
09 Mar 2011

Soft Matter, 2011,7, 4179-4188
Article type
Paper

Equilibrium chain exchange kinetics in block copolymer micelle solutions by dissipative particle dynamics simulations

Z. Li and E. E. Dormidontova, Soft Matter, 2011, 7, 4179 DOI: 10.1039/C0SM01443E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements