Gas transport in coextruded multilayered membranes with alternating dense and porous polymeric layers

Offord, Grant T.; Armstrong, Shannon R.; Freeman, Benny D.; Baer, E.; Hiltner, A.; Paul, Donald R

doi:10.1016/j.polymer.2014.01.030

Cited by 12 publications

(7 citation statements)

References 40 publications

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“…Indeed, blending such polymer pairs usually leads to materials with poor mechanical properties and a heterogeneous morphology. To improve the final properties of immiscible blends such as PE/PS without the presence of compatibilizers, multilayer coextrusion has been used to combine several systems with semi-crystalline polymers as confined materials against amorphous polymers with layer thicknesses ranging from 100 to 10 nm [ 13 , 14 , 15 , 16 ]. With the decrease of compatibilizers which seems to be complex in the classical multiphase polymer blends [ 17 ], forced assembly layer coextrusion seems to be a promised route to obtain micro-/nanostructured immiscible polymer systems.…”

Section: Introductionmentioning

confidence: 99%

Multi-Micro/Nanolayer Films Based on Polyolefins: New Approaches from Eco-Design to Recycling

et al. 2021

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This paper describes a future-oriented approach for the valorization of polyethylene-based multilayer films. The method involves going from eco-design to mechanical recycling of multilayer films via forced assembly coextrusion. The originality of this study consists in limiting the number of constituents, reducing/controlling the thickness of the layers and avoiding the use of tie layers. The ultimate goal is to improve the manufacturing of new products from recycled multilayer materials by simplifying their recyclability. Within this framework, new structures were developed with two polymer systems: polyethylene/polypropylene and polyethylene/polystyrene, with nominal micro- and nanometric thicknesses. Hitherto, the effect of the multi-micro/nanolayer architecture as well as initial morphological and mechanical properties was evaluated. Several recycling processes were investigated, including steps such as: (i) grinding; (ii) monolayer cast film extrusion; or (iii) injection molding with or without an intermediate blending step by twin-screw extrusion. Subsequently, the induced morphological and mechanical properties were investigated depending on the recycling systems and the relationships between the chosen recycling processes or strategies, and structure and property control of the recycled systems was established accordingly. Based on the results obtained, a proof of concept was demonstrated with the eco-design of multi-micro/nanolayer films as a very promising solution for the industrial issues that arise with the valorization of recycled materials.

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Section: Introductionmentioning

confidence: 99%

Multi-Micro/Nanolayer Films Based on Polyolefins: New Approaches from Eco-Design to Recycling

et al. 2021

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“…The attractiveness of this technology has even led Dow to license it to the company EDI for commercial production and sale . It has been effectively demonstrated over the years that this technology has the capability to provide enhanced material properties in many polymer systems with wide ranges of application …”

Section: Introductionmentioning

confidence: 99%

“…Various research groups have shown the broad capabilities of this technology for use in barrier enhancement, tunable mechanical properties, unique optical properties, shape memory capabilities, electronic properties, and other novel film systems . For instance, specific capabilities of producing scratch resistance polylactide, control of isotactic polypropylene crystallinity, low filler content PVC composites for microwave absorption, and shielding of neutron radiation have all been developed in film systems.…”

Section: Introductionmentioning

confidence: 99%

Microlayer and nanolayer tubing and piping via layer multiplication coextrusion. I. Validation

Schneider

Danda

Ling

et al. 2019

J of Applied Polymer Sci

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Layered annular structures produced with layer multiplication coextrusion, utilizing both a standard in‐line “spider” die, and a custom annular die, are compared in structures up to 129 layers. One multilayered system, of a Dow LDPE 5004I was utilized in generating experimental results to validate the custom die design performance. It was found that the custom design demonstrates successful extrusion of high layer number annular structures with substantial benefits over the standard spider die. Moreover, a design method incorporating angular rotation was implemented within the custom die to eliminate weld lines and attain concentric layer structures to further enhance commercial viability and mechanical integrity. Results indicate angular rotation may be utilized to generate idealized annular products with concentric layer structures. Additionally, exploration of flow through the annular die land was conducted with ANSYS Polyflow in under several conditions of angular rotation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48683.

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“…Using the unique characteristics of multilayered films has recently brought for diverse capabilities and new breakthroughs in material properties and multi-functional unitization. Examples include breathable films [2], optical gradient structures [3], shape memory polymers [4], micro-and nano-fibers [5], multilayer composites with brick-wall type microstructures [6], dual brightness enhancement film (DBEF) [7], etc. This present work mainly explores multilayer architectures for optical holography.…”

Section: Introductionmentioning

confidence: 99%

Study of wide-spectrum and high-resolution diffraction optical elements by stacks of binary phase gratings

Ho¹,

Li²

2018

Appl. Opt.

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This work theoretically investigates wide-spectrum and high-resolution diffraction optical elements (DOE) that are made of stacks of low-resolution binary phase gratings, whereby the two-dimensional grids in different grating layers are arranged with specified displacements. We remodel the common Kinoform algorithm for this multi-scale architecture. Numerical computations show that, by increasing the number of stacking layers, the resolution of diffraction fields can be improved and that the stability of optical elements within broad spectrums is significantly enhanced. Practical concern on largely increasing the number of grating layers are efficiency of the optical designs in theory and the manufacture of stacks of ultra-thin grating films.

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Gas transport in coextruded multilayered membranes with alternating dense and porous polymeric layers

Cited by 12 publications

References 40 publications

Multi-Micro/Nanolayer Films Based on Polyolefins: New Approaches from Eco-Design to Recycling

Multi-Micro/Nanolayer Films Based on Polyolefins: New Approaches from Eco-Design to Recycling

Microlayer and nanolayer tubing and piping via layer multiplication coextrusion. I. Validation

Study of wide-spectrum and high-resolution diffraction optical elements by stacks of binary phase gratings

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