Nonlinear Shear and Elongational Rheology of Poly(propylene carbonate)

Yang, Lixin; Uneyama, Takashi; Masubuchi, Yuji; Doi, Yuya

doi:10.1678/rheology.50.127

Cited by 5 publications

(1 citation statement)

References 30 publications

(56 reference statements)

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“…In this study, we performed multi-chain slip-link simulations for poly (propylene carbonate) (PPC) melts under fast shear. For this specific PPC melts, we have determined the friction as a function of segment orientation from the uniaxial data 27) in our previous study 28) . Employing this friction model, we simulated the shear behavior to see its effect on the viscosity growth curve.…”

Section: Introductionmentioning

confidence: 99%

Primitive Chain Network Simulations for Shear Rheology of Poly(propylene carbonate) Melts

Masubuchi

Yang

Uneyama

et al. 2022

J. Soc. Rheol., Jpn

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Although chemistry dependence in the non-linear rheology of polymers has been rather established for uniaxial elongations, it has not been frequently discussed for fast shear. In this study, to see the effect of orientation-dependent monomeric friction on the shear rheology, we conducted primitive chain network simulations for a few poly(propylene carbonate) melts, for which we have determined the friction model from the uniaxial data recently [Yang et al., Nihon Reoroji Gakkaishi, 50, 127-135 (2022)]. The simulation qualitatively reproduced typical non-linear behaviors, such as shear thinning and stress overshoot, under fast shears. The agreement with experimental data became better when the friction was varied according to the segment orientation. In particular, the shear rate dependence of the peak position for the stress overshoot (i.e., the peak stress and the strain at the peak) was better reproduced. This result implies that chemistry-dependent friction may probably be discussed from the stress overshoot under high shear.

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Section: Introductionmentioning

confidence: 99%

Primitive Chain Network Simulations for Shear Rheology of Poly(propylene carbonate) Melts

Masubuchi

Yang

Uneyama

et al. 2022

J. Soc. Rheol., Jpn

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Elongational viscosity of poly(propylene carbonate) melts: tube-based modelling and primitive chain network simulations

2022

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In fast elongational flows, linear polymer melts exhibit a monotonic decrease of the viscosity with increasing strain rate, even beyond the contraction rate of the polymer defined by the Rouse time. We consider two possible explanations of this phenomenon: (a) the reduction of monomeric friction and (b) the reduction of the tube diameter with increasing deformation leading to an Enhanced Relaxation of Stretch (ERS) on smaller length scales. (Masubuchi et al. (2022) reported Primitive Chain Network (PCN) simulations using an empirical friction reduction model depending on segmental orientation and could reproduce the elongational viscosity data of three poly(propylene carbonate) melts and a polystyrene melt. Here, we show that the mesoscopic tube-based ESR model (Wagner and Narimissa 2021) provides quantitative agreement with the same data set based exclusively on the linear-viscoelastic characterization and the Rouse time. From the ERS model, a parameter-free universal relation of monomeric friction reduction as a function of segmental stretch can be derived. PCN simulations using this friction reduction relation are shown to reproduce quantitatively the experimental data even without any fitting parameter. The comparison with results of the earlier PCN simulation results with friction depending on segmental orientation demonstrates that the two friction relations examined work equally well which implies that the physical mechanisms of friction reduction are still open for discussion.

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The effect of rotationality on nonlinear shear flow of polymer melts and solutions

Wagner,

Liu,

Huang

2024

Rheol Acta

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By considering the rotationality of shear flow, we distinguish between tube segments created by reptation before the inception of shear flow and those created during flow. Tube segments created before inception of shear flow experience both stretch and orientation, while tube segments created after inception of flow are not stretched, but are only aligned in the flow direction. Based on this idea, the Rotation Zero Stretch (RZS) model allows for a quantitative description of the start-up of shear flow and stress relaxation after step-shear strain experiments, in agreement with data of polystyrene long/short blends and corresponding polystyrene 3-arm star polymers investigated by Liu et al. (Polymer 2023, 281:126125), as well as the shear viscosity data of poly(propylene carbonate) melts reported by Yang et al. (Nihon Reoroji Gakkaishi 2022, 50:127–135). In the limit of steady-state shear flow, the RZS model converges to the Doi-Edwards IA model, which quantitatively describes the steady-state shear viscosity of linear polymer melts and long/short blends. The assumption of “non-stretching” of tube segments created during rotational flow is therefore in agreement with the available experimental evidence. Three-arm star polymers behave in a similar way as corresponding blends of long and short polymers confirming the solution effect of the short arm in asymmetric stars. The analysis of step-shear strain experiments reveals that stress relaxation is at first dominated by stretch relaxation, followed at times larger than the Rouse stretch relaxation time by relaxation of orientation as described by the damping function of the Doi-Edwards IA model. The RZS model does not require any nonlinear-viscoelastic parameter, but relies solely on the linear-viscoelastic relaxation modulus and the Rouse stretch relaxation time. Graphical Abstract

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Nonlinear Shear and Elongational Rheology of Poly(propylene carbonate)

Cited by 5 publications

References 30 publications

Primitive Chain Network Simulations for Shear Rheology of Poly(propylene carbonate) Melts

Primitive Chain Network Simulations for Shear Rheology of Poly(propylene carbonate) Melts

Elongational viscosity of poly(propylene carbonate) melts: tube-based modelling and primitive chain network simulations

The effect of rotationality on nonlinear shear flow of polymer melts and solutions

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