Asylmigration

Müller-Schneider, Thomas

doi:10.1007/978-3-663-11922-7_6

Cited by 1 publication

(6 citation statements)

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“…In this case, while

G^{''} false(ω false)

of both cases are completely identical,

G^{'} false(ω false)

of the transverse orientation becomes larger than that of the parallel orientation in the low frequency regime. This behavior was not reported in the previous study by Schneider and Müller, [ 15 ] where

G^{'} false(ω false)

and

G^{''} false(ω false)

of the transverse and the parallel orientations are completely identical. This discrepancy originates from two reasons.…”

Section: Finite Oscillatory Shear Flowcontrasting

confidence: 78%

“…As a similar study, the linear viscoelastic properties of the lamellar structures in unentangled diblock copolymers have already been investigated by Schneider and Müller. [ 15 ] They measured the properties of the three orientations of the lamellar structures by using Green–Kubo formula for the stress autocorrelation function in the equilibrium state where no external force is imposed on the system. The system investigated in this section is the same as the system used in the study by Schneider and Müller.…”

Section: Finite Oscillatory Shear Flowmentioning

confidence: 99%

“…In the present study, contrary to ref. [15], we impose a finite amplitude shear deformation

γ false(t false) = γ_{0} \sin false(ω t false)

, where γ 0 and ω are the amplitude and the frequency of the dynamic oscillation. We measure the storage and loss moduli,

G^{'} false(ω false)

and

G^{''} false(ω false)

, by fitting a sinusoidal function to the simulation data of the stress for over 20 periods of the oscillation.…”

Section: Finite Oscillatory Shear Flowmentioning

confidence: 99%

“…This discrepancy originates from two reasons. The first reason is that while Schneider and Müller [ 15 ] only measured the contribution from chain bonds, we measure all contributions not only from the chain‐bond contribution but also non‐bond interactions. The second reason is that we consider the actual deformation of lamellar interface under a finite amplitude oscillatory shear.…”

Section: Finite Oscillatory Shear Flowmentioning

confidence: 99%

“…In addition, particle‐type simulations such as Brownian dynamics [ 11 ] and dissipative particle dynamics (DPD) [ 12,13 ] have been performed, which focused on the transition kinetics between the two phases with parallel and perpendicular orientations of lamellar domains. [ 14 ] Recently, Schneider and Müller [ 15 ] numerically evaluated the stress relaxation functions of parallel, perpendicular, and transverse orientations of lameller domains in the linear rheological regime. They found that the stress relaxation of the perpendicular orientation is identical to that of homopolymers, and the parallel orientation to the transverse one.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Properties of Lamellae‐Forming Diblock Copolymers

Tomiyoshi

Kawakatsu

Aoyagi

et al. 2021

Advcd Theory and Sims

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The present study investigates rheological properties of microphase-separated lamellar structures formed by unentangled and weakly entangled diblock copolymer melts under a finite amplitude oscillatory shear flow and a steady shear flow. To simulate such a system, dissipative particle dynamics (DPD) simulation is employed to reproduce the lamellar structures, where a multi-chain slip-spring model is combined with DPD simulation to mimic entanglement effects. By imposing an oscillatory shear flow, this model enables us to measure storage and loss moduli for three different (parallel, perpendicular, and transverse) lamellar orientations with respect to the flow direction. These orientations display distinctive rheological behaviors, and especially the transverse orientation exhibits a peculiar behavior owing to a finite expansion of the lamellar interfaces, which differs from a previous study. In a steady shear flow, steady shear viscosities of parallel and perpendicular orientations are evaluated. In this case, the orientations of lamellar domains and the local orientation and stretching of bonds near the lamellar interfaces affect the steady shear viscosities. A spatial distribution of entanglements also affects the steady shear viscosities differently from another previous study.

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“…In this case, while