Sensing adsorption kinetics through slip velocity measurements of polymer melts

Hénot, Marceau; Drockenmuller, Éric; Léger, Liliane; Restagno, Frédéric

doi:10.1140/epje/i2018-11697-4

Cited by 4 publications

(3 citation statements)

References 54 publications

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“…5,8,18 As can be seen in Figure 2, for some of the investigated systems {ϕ, surface}, two regimes of slip are evidenced: at low shear rates, b first increases with γ̇until it reaches a plateau for γ̇> γ*, with the critical shear rate γ* depending on both the substrate and the polymer volume fraction. A similar transition from weak to large slip has already been observed for both melts 5,35,36 and polymer solutions. 6,10 It has been attributed to the progressive disentanglement between the bulk flowing chains and few chains adsorbed on the substrate.…”

Section: ■ Materials and Methodssupporting

confidence: 79%

Slip and Friction Mechanisms at Polymer Semi-Dilute Solutions/Solid Interfaces

et al. 2021

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The role of the polymer volume fraction, φ, on steady state slippage and interfacial friction is investigated for a semi-dilute polystyrene solutions in diethyl phthalate in contact with two solid surfaces. Significant slippage is evidenced for all samples, with slip lengths b obeying a power law dependence. The Navier's interfacial friction coefficient, k, is deduced from the slip length measurements and from independent measurements of the solutions viscosity η. The observed scaling of k versus φ clearly excludes a molecular mechanism of friction based on the existence of a depletion layer. Instead, we show that the data of η(φ) and k(φ) are understood when taking into account the dependence of the solvent friction on φ. Two models, based on the friction of blobs or of monomers on the solid surface, well describe our data. Both points out that the Navier's interfacial friction is a semi-local phenomenon.

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Section: ■ Materials and Methodssupporting

confidence: 79%

Slip and Friction Mechanisms at Polymer Semi-Dilute Solutions/Solid Interfaces

et al. 2021

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“…2, for some of the investigated systems {φ,surface}, two regimes of slip are evidenced: at low shear rates, b first increases with γ, until it reached a plateau for γ > γ * , with the critical shear rate γ * depending on both the substrate and the polymer volume fraction. A similar transition from weak to large slip has already been observed for both melts [5,35,36] and polymer solutions [6,10]. It has been attributed to the progressive disentanglement between the bulk flowing chains and few chains adsorbed on the substrate.…”

Section: Dependence Of the Slip Length On The Polymer Volume Fractionsupporting

confidence: 72%

Slip and friction mechanisms at polymer semi-dilute solutions / solid interfaces

Grzelka,

Antoniuk,

Drockenmuller

et al. 2021

Preprint

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“…An important physical behavior that occurs in confined polymer systems is the interfacial slip of polymer chains at the boundary walls, which is considered one of the major physical origins of the melt instability phenomena of polymer extrudates during practical extrusion processes. The slip behavior essentially represents the interfacial dynamic interactions between the polymer chains and the wall surface [ 6 , 7 , 8 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Structural and Dynamical Characteristics of Short-Chain Branched Ring Polymer Melts at Interface under Shear Flow

Jeong

Cho

et al. 2020

Polymers

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We present a detailed analysis of the interfacial chain structure and dynamics of confined polymer melt systems under shear over a wide range of flow strengths using atomistic nonequilibrium molecular dynamics simulations, paying particular attention to the rheological influence of the closed-loop ring geometry and short-chain branching. We analyzed the interfacial slip, characteristic molecular mechanisms, and deformed chain conformations in response to the applied flow for linear, ring, short-chain branched (SCB) linear, and SCB ring polyethylene melts. The ring topology generally enlarges the interfacial chain dimension along the neutral direction, enhancing the dynamic friction of interfacial chains moving against the wall in the flow direction. This leads to a relatively smaller degree of slip (ds) for the ring-shaped polymers compared with their linear analogues. Furthermore, short-chain branching generally resulted in more compact and less deformed chain structures via the intrinsically fast random motions of the short branches. The short branches tend to be oriented more perpendicular (i.e., aligned in the neutral direction) than parallel to the backbone, which is mostly aligned in the flow direction, thereby enhancing the dynamic wall friction of the moving interfacial chains toward the flow direction. These features afford a relatively lower ds and less variation in ds in the weak-to-intermediate flow regimes. Accordingly, the interfacial SCB ring system displayed the lowest ds among the studied polymer systems throughout these regimes owing to the synergetic effects of ring geometry and short-chain branching. On the contrary, the structural disturbance exerted by the highly mobile short branches promotes the detachment of interfacial chains from the wall at strong flow fields, which results in steeper increasing behavior of the interfacial slip for the SCB polymers in the strong flow regime compared to the pure linear and ring polymers.

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Sensing adsorption kinetics through slip velocity measurements of polymer melts

Cited by 4 publications

References 54 publications

Slip and Friction Mechanisms at Polymer Semi-Dilute Solutions/Solid Interfaces

Slip and Friction Mechanisms at Polymer Semi-Dilute Solutions/Solid Interfaces

Slip and friction mechanisms at polymer semi-dilute solutions / solid interfaces

Structural and Dynamical Characteristics of Short-Chain Branched Ring Polymer Melts at Interface under Shear Flow

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