Relaxation of a single dendrimer

Nobuyuki Iwaoka, Hiroshi Takano

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Relaxation process of a single dendrimer with excluded volume effects is studied in the free-draining limit for various parameters characterizing the architecture of the dendrimer, which are the functionality of central segment fc, the functionality of branching segments f , the number of generations G and the number of bonds in each spacer between branching segments P. By assuming that the dendrimer relaxes hierarchically from the outermost generation to the central segment after relaxation of the spacers, a scaling law τ1 ∼ f 1-νc {(f - 1)f 1-ν}G-1P2ν+1 for the longest relaxation time τ1 is derived, where ν ≈ 0.588 is the Flory exponent. Another scaling law for relaxation times of other antisymmetric relaxation modes is also derived. In order to verify the scaling laws, Brownian dynamics simulations of a single dendrimer are performed and relaxation times are estimated by the relaxation mode analysis method. The scaled relaxation time τ1/( f 1-ν cP2ν+1) is proportional to {( f - 1)f 1-x}G-1, where the exponent x corresponding to is estimated as x ≈ 0.66 for f = 3 and 0.63 for f = 4. It is found that τ1/( f 1-ν c {(f - 1)f 1-x}G-1) ∝ P2y+1, where the exponent y that corresponds to ν is estimated as y ≈ 0.58. The agreement with the predicted scaling law becomes better as G and f becomes larger, where the concentration of segments becomes larger. The other scaling law for other antisymmetric relaxation modes is also verified.

Original languageEnglish
Article number064801
JournalJournal of the Physical Society of Japan
Volume82
Issue number6
DOIs
Publication statusPublished - 2013 Jun

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dendrimers
scaling laws
relaxation time
exponents
spacers
drainage
simulation

Keywords

  • Branched polymer
  • Brownian dynamics simulations
  • Dendrimer
  • Excluded volume effects
  • Relaxation modes
  • Relaxation times
  • Single polymer

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Relaxation of a single dendrimer. / Iwaoka, Nobuyuki; Takano, Hiroshi.

In: Journal of the Physical Society of Japan, Vol. 82, No. 6, 064801, 06.2013.

Research output: Contribution to journalArticle

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