Viscoelastic Properties of Low Molecular Weight Symmetric Poly(styrene-&lt;i&gt;b&lt;/i&gt;-2-vinylpyridine)s in the Ordered and Disordered States under Steady Shear Flow

Takahashi, Yoshiaki; Fang, Long; Takano, Atsushi; Torikai, Naoya; Matsushita, Yushu

doi:10.1678/rheology.41.83

Cited by 4 publications

(17 citation statements)

References 43 publications

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“…32) and PS 37) , respectively. Symbols are denoted in the figure. SP27, 34) we can conclude that power law behavior of G* SP for SP27 can be attributed to the responses from grains/defects. ).…”

Section: Resultsmentioning

confidence: 75%

“…Note that steady flow measurement is useless for SP103 since steady state cannot be reached at low shear rates while sample became instable at high shear rates. 34) It is shown in Figure 6 (1) and (2) irrespective of the pre-shear flows as shown in the figure by (1) and (2) for G* chain . Other symbols are denoted in the figure.…”

Section: Solid Lines Inmentioning

confidence: 77%

“…30,31,34) Table I. According to the previous ODT analysis 34,35) , we can say that SP27 is in the weak segregation regime while SP103 is in the strong segregation regime.…”

Section: Samplesmentioning

confidence: 78%

“…Former case corresponds to non entangled tethered chain tethered on a flat wall and latter corresponds to Rouse chain. In reality, junction point of two components can defuse on the lamellar interface and free energy barrier for interpenetration of components is not so strong since SP27 is in weak segregation regime (mean field χN value: 14 at 160˚C) 34) , it is expected that ∆G* chain are similar to the Rouse type relaxations.…”

Section: Resultsmentioning

confidence: 99%

“…34) In this article, a new separation method between responses from grains/defects and chain relaxation mode is discussed for dynamic viscoelastic properties of an SP sample, which was able to be well aligned under steady shear flow in the ordered states, are studied including the effect of pre-shear. Based on the above results, data for a higher molecular weight sample is also examined.…”

Section: Introductionmentioning

confidence: 99%

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A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-<i>b</i>-2-vinylpyridine)s in the Ordered State

Fang

Takahashi

Takano

et al. 2013

J. Soc. Rheol., Jpn

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Separation method of responses from large scale motions and polymer chain motions are investigated for viscoelastic properties of symmetric poly(styrene-b-2-vinylpyridine)s (SP) in the ordered state taking into account of the effects of flow history on the sample. Due to the almost same thermo-rheological properties of components, master curves of dynamic moduli for SP, G* SP are obtained and shown that the data well coincide with those of polystyrene homopolymers (hPS) at high frequency ω, while responses from large scale motions of lamellar structure, ∆G* grain are observed at low ω, which asymptote to ∆G* grain ~ ω 0.5 . After the pre-shear, magnitude of ∆G* grain became lower at the lower ω region. When the magnitude of G* SP are appropriately higher than ∆G* grain extended to higher ω, ∆G* grain and the responses of polymer chains, ∆G* chain , having Rouse like modes, are successfully obtained by subtraction, ∆G* chain = G* SP -∆G* grain , irrespective of pre-shear. By combining thus obtained ∆G* grain, ∆G* chain , and the data for hPS, G* hPS at higher ω region, G* SP data can be well approximated in a whole frequency range of the measurement.

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Section: Resultsmentioning

confidence: 75%

Section: Solid Lines Inmentioning

confidence: 77%

“…30,31,34) Table I. According to the previous ODT analysis 34,35) , we can say that SP27 is in the weak segregation regime while SP103 is in the strong segregation regime.…”

Section: Samplesmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-<i>b</i>-2-vinylpyridine)s in the Ordered State

Fang

Takahashi

Takano

et al. 2013

J. Soc. Rheol., Jpn

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Diblock Copolymers with Similar Glass Transition Temperatures in Both Blocks for Comparing Shear Orientation Processes with DPD Computer Simulations

Heck

Schneider

Müller

et al. 2018

Macro Chemistry & Physics

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The purpose of this study is the development of phase‐separating diblock copolymer model systems suitable for the comparison between the orientation process under shear and computer simulations of the same process. To do so, the polymer systems have to fulfill certain requirements like similar dynamics of both polymer blocks, which are associated with comparable glass transition temperatures. The development of suitable diblock copolymer systems such as poly(ethyl methacrylate)‐b‐poly(2‐vinylpyridine) or the tuning of already established polymer systems like polystyrene‐b‐poly(2‐vinylpyridine) via copolymerization with 4‐vinylpyridine is essential. Anionic polymerization is used for the sample synthesis to achieve this goal with the lowest possible polydispersity. Soft, coarse‐grained models are used to study the block dynamics in computer simulations. Within the dissipative particle dynamics methods the remaining differences in the block mobility are addressed. The experimentally determined zero‐shear viscosity η0 is used to match the simulation results to the synthesized polymer melts.

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Rheology in shear and elongation and dielectric spectroscopy of polystyrene-block-poly(4-vinylpyridine) diblock copolymers

Kollmetz

Georgopanos

Handge

2017

Polymer

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Viscoelastic Properties of Low Molecular Weight Symmetric Poly(styrene-<i>b</i>-2-vinylpyridine)s in the Ordered and Disordered States under Steady Shear Flow

Cited by 4 publications

References 43 publications

A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-<i>b</i>-2-vinylpyridine)s in the Ordered State

A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-<i>b</i>-2-vinylpyridine)s in the Ordered State

Diblock Copolymers with Similar Glass Transition Temperatures in Both Blocks for Comparing Shear Orientation Processes with DPD Computer Simulations

Rheology in shear and elongation and dielectric spectroscopy of polystyrene-block-poly(4-vinylpyridine) diblock copolymers

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