Modeling of internal residual stress in linear and branched polyethylene films during cast film extrusion: Towards a prediction of heat-shrinkability

Bourg, Violette; Ienny, Patrick; Caro-Bretelle, A. S.; Moigne, Nicolas Le; Guillard, Valérie; Bergeret, Anne

doi:10.1016/j.jmatprotec.2019.04.002

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Generally, the Mullins effect is dependent on the temperature and time, in which the temperature impact exponentially and time linearly controls the recovery. 34,35 Also, recovery of the residual set is achievable even at room temperature if relaxed for a long time. 36 The permanent set of nanocomposites is recovered by increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Study Mullins effect of polyurethane reinforcement with halloysite nanotube by molecular dynamics simulation

Pebdani

2022

Journal of Elastomers & Plastics

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Molecular dynamics simulation was applied to study the irreversible strain through loading and unloading cyclic tests of polyurethane (PU) reinforced with halloysite nanotube (HNT). The influences of the stretching cycle rate, different temperatures, the volume of halloysite nanotube and the density rate of the hard and soft domain of PU were studied on the permanent set. The results illustrate that the residual strain was increasing when the stretching loading is increasing, for example, with increasing strain load to 250% the residual strain increased to 55%. In contrast, the increasing volume fraction of HNT and hard part content of PU lead to lower residual strain. The recovery of the permanent set is achievable by increasing temperature from 1 K to 200 K residual strain is decreased to 52%. An Ogden constitutive and the theory of pseudo-elasticity were adopted to simulate this composite in the ABAQUS software. This model has proposed a reasonable prediction of plastic deformation.

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Section: Resultsmentioning

confidence: 99%

Study Mullins effect of polyurethane reinforcement with halloysite nanotube by molecular dynamics simulation

Pebdani

2022

Journal of Elastomers & Plastics

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“…Meltdown is not the only cause of short circuiting, as thermal shrinkage is also common in stretched PE [37] and PP films [38]. When a stretched film is subjected to a sudden increase in temperature, it shrinks as a result of the relaxation of polymer chains that were oriented under stress [39]. For this reason, uniaxially stretched PP membranes shrink only a small amount in the TD.…”

Section: Thermal Stability For Safety Featuresmentioning

confidence: 99%

Manufacturing Processes of Microporous Polyolefin Separators for Lithium-Ion Batteries and Correlations between Mechanical and Physical Properties

Mun¹,

Won

2021

Crystals

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Rechargeable lithium-ion batteries (LIBs) have emerged as a key technology to meet the demand for electric vehicles, energy storage systems, and portable electronics. In LIBs, a permeable porous membrane (separator) is an essential component located between positive and negative electrodes to prevent physical contact between the two electrodes and transfer lithium ions. Among several types, microporous polyolefin membranes have dominated the commercial separator market for LIBs operated with liquid electrolytes, favored for their chemical and electrochemical stability, high mechanical strength, uniform pore size, and inexpensive manufacturing and materials cost. In this review, we summarize the principles and theoretical background underlying conventional manufacturing processes and newly emerging microporous polyolefin separators. Based on their mechanical and physical properties, as collected from the literature, we introduce a number of processing type-dependent characteristics and universal correlations among their properties. This will provide a macroscopic view on the subject and a guideline for the development of next-generation separators.

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“…Generally, the Mullins effect is dependent on the temperature and time, in which the temperature impacts exponentially, and time linearly, the recovery [148], [149]. Also, recovery of the residual set is achievable even at room temperature if relaxed for a long time [150].…”

Section: Temperature Evaluatesmentioning

confidence: 99%

Atomic simulation of pull-out Halloysite nanotube from polyurethane by molecular dynamic method

Pebdani¹

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The main restriction to employ different types of materials in ballistic applications is the disability to absorb energy exposure in high impact velocity, especially in civilian and defence applications. Nanomaterials and Nano-composites have been studied in various applications. One innovative approach is to employ a polymer in combination with a strong nanomaterial. In this study, we will consider a composite where the polymer matrix is a polyurethane (PU) and the nanoscale material is a Halloysite nanotube (HNT).Mechanical properties are one crucial aspect of designing new material which significantly depends on nanofiller incorporation. Therefore, first, we analyze the lattice parameters of Halloysite (HNT) applying the Quantum Mechanics (QM), specifically Density Functional Theory (DFT). Then the molecular dynamics simulation was carried out to determine the Elastic modulus of Halloysite nanotube with zigzag and armchair arrangements. The elastic modulus of both arrangements is decreased with an increase in radius. Second, we used density functional theory to compute interaction energy between HNT-PU. Then the Machine Learning (ML) method with the particle swarm optimization (PSO) algorithm has been applied to fitting force field parameters of Molecular Mechanics (MM) using data from DFT calculations. The excellent agreement between the interaction energy from DFT and the optimized force field model was achieved. The optimum Lennard-Jones parameters were obtained by the interaction energy matching between DFT and MM results with less than 5 kcal/mol discrepancy. In this research, we present an

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Modeling of internal residual stress in linear and branched polyethylene films during cast film extrusion: Towards a prediction of heat-shrinkability

Cited by 6 publications

References 11 publications

Study Mullins effect of polyurethane reinforcement with halloysite nanotube by molecular dynamics simulation

Study Mullins effect of polyurethane reinforcement with halloysite nanotube by molecular dynamics simulation

Manufacturing Processes of Microporous Polyolefin Separators for Lithium-Ion Batteries and Correlations between Mechanical and Physical Properties

Atomic simulation of pull-out Halloysite nanotube from polyurethane by molecular dynamic method

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