Rheological properties of linear and short-chain branched polyethylene with nearly monodispersed molecular weight distribution

Kida, Takumitsu; Doi, Yuya; Tanaka, Ryō; Uneyama, Takashi; Shiono, Takeshi; Masubuchi, Yuichi

doi:10.1007/s00397-021-01286-0

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…However, such a discussion is difficult for PMMA [26]. An ideal benchmark would be polyethylene, for which elongational data are available for some systems with small polydispersity indices [30]. However, crystallization and small rheological activation energy do not allow us to measure the behavior under fast and high stretch.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

et al. 2022

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It has been established that the elongational rheology of polymers depends on their chemistry. However, the analysis of experimental data has been reported for only a few polymers. In this study, we analyzed the elongational viscosity of poly (propylene carbonate) (PPC) melts in terms of monomeric friction via primitive chain network simulations. By incorporating a small polydispersity of materials, the linear viscoelastic response was semi-quantitatively reproduced. Owing to this agreement, we determined units of time and modulus to carry out elongational simulations. The simulation with constant monomeric friction overestimated elongational viscosity, whereas it nicely captured the experimental data if friction decreased with increasing segment orientation. To see the effect of chemistry, we also conducted the simulation for a polystyrene (PS) melt, which has a similar entanglement number per chain and a polydispersity index. The results imply that PPC and PS behave similarly in terms of the reduction of friction under fast deformations.

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Section: Introductionmentioning

confidence: 99%

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

et al. 2022

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Effect of melting temperatures on the orientation and rheology of polyacrylate/silica (PAcr/SiO₂) composite microspheres in twin‐screw extruder

Cui

Zhang

Zhu

et al. 2022

J of Applied Polymer Sci

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The dispersion and orientation arrangement of functional polymers with fillers are critical to their performance. However, there are rare detailed researches on the visualization of the orientation process about functional fillers in composite melts and the mechanistic effects on performance. In this work, it explored the change process of the orientation morphology for polyacrylate/silica (PAcr/SiO2) composite microspheres in polymethyl methacrylate (PMMA) at different melting temperatures. Afterwards, the morphology and distribution of oriented microfibers in composite fibers melted at different temperatures were observed by transmission electron microscope (TEM). The results showed that composite microfibers could be formed in tight arrangement and obtained average orientation of 50.88 in the composite fibers at 250°C. Under this circumstance, the addition of nano SiO2 particles had no effect on the rheological type. Meanwhile, the shear stress was 99.29% higher than that of pure PMMA system under the same conditions. As for the elongation at break, it was found that the elongation at break of the composite fiber prepared at 250°C was 169.43% higher than that of pure PMMA. Therefore, it provided a new method to achieve well dispersion of functional fillers in molten systems. Furthermore, it was beneficial to enhance the elongation at break of functional composites.

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Effect of short-chain branches in high-molecular-weight component on tensile properties of polyethylene solids

Kida,

Tanaka,

Shiono

et al. 2024

Polymer

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Rheological properties of linear and short-chain branched polyethylene with nearly monodispersed molecular weight distribution

Cited by 5 publications

References 40 publications

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

Effect of melting temperatures on the orientation and rheology of polyacrylate/silica (PAcr/SiO₂) composite microspheres in twin‐screw extruder

Effect of short-chain branches in high-molecular-weight component on tensile properties of polyethylene solids

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Rheological properties of linear and short-chain branched polyethylene with nearly monodispersed molecular weight distribution

Cited by 5 publications

References 40 publications

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

Analysis of Elongational Viscosity of Entangled Poly (Propylene Carbonate) Melts by Primitive Chain Network Simulations

Effect of melting temperatures on the orientation and rheology of polyacrylate/silica (PAcr/SiO2) composite microspheres in twin‐screw extruder

Effect of short-chain branches in high-molecular-weight component on tensile properties of polyethylene solids

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Effect of melting temperatures on the orientation and rheology of polyacrylate/silica (PAcr/SiO₂) composite microspheres in twin‐screw extruder