Extensional-shear coupled flow-induced morphology and phase evolution of polypropylene/ultrahigh molecular weight polyethylene blends: Dissipative particle dynamics simulations and experimental studies

Wang, Junxia; Cao, Changlin; Chen, Xiaochuan; Ren, Shijie; Yu, Dingshan; Chen, Xudong

doi:10.1016/j.polymer.2019.02.031

Cited by 20 publications

(17 citation statements)

References 46 publications

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“…This significantly limits the possibilities of its processing by methods typical for thermoplastic polymers, such as screw extrusion, injection molding, FDM, etc. For this reason, improving the processability of UHMWPE, as well as the UHMWPE-based composites, in terms of ensuring extrudability is relevant [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Taguchi Optimization of Parameters for Feedstock Fabrication and FDM Manufacturing of Wear-Resistant UHMWPE-Based Composites

et al. 2020

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It is believed that the structure and properties of parts fabricated by additive (i.e., non-stationary) manufacturing are slightly worse compared to hot pressing. To further proceed with improving the quality of Fused Deposition Modeling 3D-printed parts, the ‘UHMWPE + 17 wt.% HDPE-g-SMA + 12 wt.% PP’ composite feedstock fabrication parameters, by the twin-screw extruder compounding and 3D printing (the Fused Deposition Modeling (FDM) process), were optimized using the Taguchi method. The optimization was carried out over the results of mechanical tests. The obtained results were interpreted in terms of (1) the uniformity of mixing of the polymer components upon compounding and (2) the homogeneity of the structure formed by the 3D printing. The values of the main factors (the processing parameters) were determined using the Taguchi method. Their application made it possible to improve the physical, mechanical, and tribological properties of the samples manufactured by the FDM method at the level of neat UHMWPE as well as the UHMWPE-based composites fabricated by compression sintering. A comparative analysis of the structure, as well as the mechanical and tribological properties of the composite obtained by the FDM method, and the hot pressing from ‘optimized’ feedstock was performed. The ‘UHMWPE + 17 wt.% HDPE-g-SMA + 12 wt.% PP’ composites fabricated by the optimal compounding and 3D printing parameters can be implemented for the additive manufacturing of complex shape products (including medical implants, transport, mining, and processing industries; in particular, in the Far North).

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Section: Introductionmentioning

confidence: 99%

Taguchi Optimization of Parameters for Feedstock Fabrication and FDM Manufacturing of Wear-Resistant UHMWPE-Based Composites

et al. 2020

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“…[12][13][14][15] DPD simulation has been proved to be a powerful tool for offering intuitive pictures of micromorphologies and temporal evolutions. In our earlier computational efforts, [16][17][18] considerable progress was made in molecular-level understanding of the structure and properties of ultrahigh molecular weight polyethylene (UHMWPE) based materials in response to extensional-shear coupled flow with the aid of MD and DPD simulations.…”

Section: Introductionmentioning

confidence: 99%

Chain conformation and dynamics in ultrahigh molecular weight polyethylene melts undergoing extensional–shear coupled flow: insight from dissipative particle dynamics simulation

Wang

Chen

Cao

et al. 2020

Polymer International

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A first attempt is made to present a detailed mesoscopic-level description of the conformation and equilibrium dynamic properties of macromolecular chains in ultrahigh molecular weight polyethylene/polypropylene blends driven by extensiondominated coupled flow, in comparison with shear-dominated coupled flow. Extension-dominated coupled flow can be defined as _ γ = 0.005, _ ε ≥ 0.1 and shear-dominated coupled flow as _ ε = 0.1, _ γ ≥ 1, as verified by the time-dependent evolution tendency of cell parameters and velocity profiles along the x, y, z directions. In the case of extension-dominated coupled flow, the chains are greatly elongated and prefer to align along the flow direction, where the polypropylene chains appear to form a somewhat uniform layer. By comparison, the macromolecular chains assume a highly collapsed conformation and have a greater preference to align themselves perpendicular to the flow direction under shear-dominated coupled flow, which can be ascribed to the rapid diffusion of polymer chains and a minor role of the weak van de Waals interaction in structural transitions. Analyses of conformational behavior derived from dissipative particle dynamics trajectories can, in general, serve as a useful guideline for experimental investigations of ultrahigh molecular weight polyethylene based materials prepared by eccentric rotor extrusion.

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“…[14] Similar results were found by processing nanocomposites made up of MMT nanoclay/poly(L-lactic acid)/poly(ethylene glycol) using the ERE, [15] and the effects of processing through the ERE on the morphology of PP/ultrahigh molecular weight polyethylene was simulated and compared to experimental results. [16] Furthermore, the ERE machine design concept was extended to a twin-screw configuration and used to blend polylactide (PLA)/polyvinylidene fluoride. [17] Additionally, Velankar et al [18] mapped the effects of addition of various loadings of fumed silica to immiscible blends of polyisobutylene and polyethylene oxide (PEO) with respect to morphology.…”

Section: Introductionmentioning

confidence: 99%

Effects of extensional flow and nanofiller incorporation on dispersed phase size in the blending of high‐viscosity‐ratio immiscible vinyl polymers

Thompson

Agarwal

Gupta

2021

Vinyl Additive Technology

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Extensional-shear coupled flow-induced morphology and phase evolution of polypropylene/ultrahigh molecular weight polyethylene blends: Dissipative particle dynamics simulations and experimental studies

Cited by 20 publications

References 46 publications

Taguchi Optimization of Parameters for Feedstock Fabrication and FDM Manufacturing of Wear-Resistant UHMWPE-Based Composites

Taguchi Optimization of Parameters for Feedstock Fabrication and FDM Manufacturing of Wear-Resistant UHMWPE-Based Composites

Chain conformation and dynamics in ultrahigh molecular weight polyethylene melts undergoing extensional–shear coupled flow: insight from dissipative particle dynamics simulation

Effects of extensional flow and nanofiller incorporation on dispersed phase size in the blending of high‐viscosity‐ratio immiscible vinyl polymers

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