Terminal relaxation behavior of entangled linear polymers blended with ring and dumbbell-shaped polymers in melts

Doi, Yuya; Takano, Atsushi; Takahashi, Yoshiaki; Matsushita, Yushu

doi:10.1007/s00397-022-01355-y

Cited by 7 publications

(6 citation statements)

References 49 publications

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“…Ring polymers (RPs) have been studied theoretically and experimentally for decades due to their unique topology, behavior, and properties. − In contrast to linear polymer (LP) chains, a number of characteristic chain lengths are found for nonconcatenated RP chains. The scaling laws depend on the degree of polymerization (DP n ) and polydispersity. , Accordingly, the relaxation behavior also varies from pure Rouse to the double-folded lattice-animal or fractal loopy globule model as DP n increases from the unentangled to the highly entangled regime.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Rheology of Linear/Ring Polymer Blends from the Polymorphism of Ring Components

Yan,

Wang

2024

Macromolecules

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In this work, we propose a simple way to predict the diffusion and rheological properties of linear-ring polymer blends (LRB) by taking into account the polymorphic nature of the ring polymer components. In LRB, the ring components are separated by free rings and threaded rings, and their different dynamic behaviors are confirmed with the help of molecular dynamics simulation. A master curve of the LRB was established as a function of the linear chain concentration, the molar mass of linear and ring polymers, and the fraction of free ring polymers. Furthermore, the diffusion coefficient of threaded ring chains and the relaxation modulus of the blend are obtained based on the tube model framework. In our model, the relaxation of the blend is correlated with the polymorphism of the ring components, in which the threaded ring polymers relax through a constraint release hopping dynamics, while the unthreaded ring chains relax as a free ring. The threaded ring also reduces the constraint release effect for linear chains. Our theoretical prediction agrees with both simulation and experimental data with proper parametrization, which can be used to predict the dynamics of linear/ring blends for a wide range of compositions.

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Section: Introductionmentioning

confidence: 99%

Predicting the Rheology of Linear/Ring Polymer Blends from the Polymorphism of Ring Components

Yan,

Wang

2024

Macromolecules

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“…Their blend of dumbbell-shaped and long linear polymers revealed that the dumbbell chain acts as a pseudo-entanglement point with a longer characteristic time than that of the host linear chain. 6 However, while the understanding of monocyclic rings has progressed rapidly in recent years, the basic understanding of multicyclic polymers, except for these pioneering works, is still in its infancy. This is because many studies have concentrated on monocyclic rings, especially those with much larger molecular weights than the entanglement molecular weight of linear polymers.…”

Section: Introductionmentioning

confidence: 99%

Topological transition in multicyclic chains with structural symmetry inducing stress-overshoot phenomena in multicyclic/linear blends under biaxial elongational flow

Murashima¹,

Hagita²,

Kawakatsu³

2022

Preprint

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Blends of multicyclic and linear polymers under biaxial elongational flow were analyzed using coarse-grained molecular dynamics simulations. The multicyclic/linear blends displayed overshoot in the normal stress difference at the start-up of biaxial elongational flow. This overshoot was steeper for multicyclic/linear blends than for our previously reported monocyclic/linear blends [T. Murashima, K. Hagita, and T. Kawakatsu, Macromolecules, 2021, 54, 7210]. Investigation of the origin of the overshoot in the multicyclic/linear blends revealed a different mechanism than that previously observed in our monocyclic/linear blends. Specifically, a "topological transition" mechanism comprising a morphological change from the opento closed-ring state was observed in the multicyclic chains, but not in the monocyclic chains. This topological transition drastically changes the stress of the rings. Although the topological transition was also observed in asymmetric-multicyclic/linear blends, no stress overshoot appeared, owing to the asymmetry in the multicyclic chains. Therefore, we hypothesized that the structural symmetry in multicyclic chains is indispensable for overshoot behavior to occur.We determined that the topological transition in multicyclic chains with structural symmetry induces stress-overshoot behavior in multicyclic/linear blends under biaxial elongational flow.

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“…Doi et al investigated a dumbbell-shaped polymer consisting of two small rings and a short linear chain. Their blend of dumbbell-shaped and long linear polymers revealed that the dumbbell chain acts as a pseudo-entanglement point with a longer characteristic time than that of the host linear chain . However, while the understanding of monocyclic rings has progressed rapidly in recent years, the basic understanding of multicyclic polymers, except for these pioneering works, is still in its infancy.…”

Section: Introductionmentioning

confidence: 99%

“…Their blend of dumbbell-shaped and long linear polymers revealed that the dumbbell chain acts as a pseudoentanglement point with a longer characteristic time than that of the host linear chain. 6 However, while the under-standing of monocyclic rings has progressed rapidly in recent years, the basic understanding of multicyclic polymers, except for these pioneering works, is still in its infancy. This is because many studies have concentrated on monocyclic rings, especially those with much larger molecular weights than the entanglement molecular weight of linear polymers.…”

Section: Introductionmentioning

confidence: 99%

Topological Transition in Multicyclic Chains with Structural Symmetry Inducing Stress-Overshoot Phenomena in Multicyclic/Linear Blends under Biaxial Elongational Flow

2022

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Blends of multicyclic and linear polymers under biaxial elongational flow were analyzed using coarse-grained molecular dynamics simulations. The multicyclic/linear blends displayed overshoot in the normal stress difference at the start-up of the biaxial elongational flow. This overshoot was steeper for multicyclic/linear blends than for our previously reported monocyclic/linear blends [Murashima, T.; Hagita, K.; Kawakatsu, T. Macromolecules 2021, 54, 7210–7225]. Investigation of the origin of the overshoot in the multicyclic/linear blends revealed a different mechanism than that previously observed in our monocyclic/linear blends. Specifically, a “topological transition” mechanism comprising a morphological change from the open- to closed-ring state was observed in the multicyclic chains, but not in the monocyclic chains. This topological transition drastically changes the stress of the rings. Although the topological transition was also observed in asymmetric-multicyclic/linear blends, no stress overshoot appeared, owing to the asymmetry in the multicyclic chains. Therefore, we hypothesized that the structural symmetry in multicyclic chains is indispensable for the overshoot behavior to occur. We determined that the topological transition in multicyclic chains with structural symmetry induces the stress-overshoot behavior in multicyclic/linear blends under biaxial elongational flow.

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Terminal relaxation behavior of entangled linear polymers blended with ring and dumbbell-shaped polymers in melts

Cited by 7 publications

References 49 publications

Predicting the Rheology of Linear/Ring Polymer Blends from the Polymorphism of Ring Components

Predicting the Rheology of Linear/Ring Polymer Blends from the Polymorphism of Ring Components

Topological transition in multicyclic chains with structural symmetry inducing stress-overshoot phenomena in multicyclic/linear blends under biaxial elongational flow

Topological Transition in Multicyclic Chains with Structural Symmetry Inducing Stress-Overshoot Phenomena in Multicyclic/Linear Blends under Biaxial Elongational Flow

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