Existence of a Critical Layer Thickness in PS/PMMA Nanolayered Films

Bironeau, Adrien; Salez, Thomas; Miquelard‐Garnier, Guillaume; Sollogoub, Cyrille

doi:10.1021/acs.macromol.7b00176

Cited by 47 publications

(52 citation statements)

References 85 publications

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“…A majority of the experiments presented here were conducted using commercial extrusion grades of polystyrene (PS) and polymethylmethacrylate (PMMA) that are also used for our multilayer coextrusion studies. 47,58 Specifically, we used PS 1340 from Total, as well as PMMA VM100 and PMMA 825T supplied by Arkema (Altuglas®). To confirm results obtained using PS 1340, a nonformulated and less disperse analog has been used (weight-averaged molecular weight 244 kg/mol from Polymer Source, Inc., termed PS 244k).…”

Section: Methodsmentioning

confidence: 99%

Influence of outer-layer finite-size effects on the dewetting dynamics of a thin polymer film embedded in an immiscible matrix

et al. 2018

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In capillary-driven fluid dynamics, simple departures from equilibrium offer the chance to quantitatively model the resulting relaxations. These dynamics in turn provide insight on both practical and fundamental aspects of thin-film hydrodynamics. In this work, we describe a model trilayer dewetting experiment elucidating the effect of solid, no-slip confining boundaries on the bursting of a liquid film in a viscous environment. This experiment was inspired by an industrial polymer processing technique, multilayer coextrusion, in which thousands of alternating layers are stacked atop one another. When pushed to the nanoscale limit, the individual layers are found to break up on time scales shorter than the processing time. To gain insight on this dynamic problem, we here directly observe the growth rate of holes in the middle layer of the trilayer films described above, wherein the distance between the inner film and solid boundary can be orders of magnitude larger than its thickness. Under otherwise identical experimental conditions, thinner films break up faster than thicker ones. This observation is found to agree with a scaling model that balances capillary driving power and viscous dissipation with a no-slip boundary condition at the solid substrate/viscous environment boundary. In particular, even for the thinnest middle-layers, no finite-size effect related to the middle film is needed to explain the data. The dynamics of hole growth is captured by a single master curve over four orders of magnitude in the dimensionless hole radius and time, and is found to agree well with predictions including analytical expressions for the dissipation.

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Section: Methodsmentioning

confidence: 99%

Influence of outer-layer finite-size effects on the dewetting dynamics of a thin polymer film embedded in an immiscible matrix

et al. 2018

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“…In our case, a slight orientation begins to appear at 50 nm and could probably be more marked for thinner layers. However, the reduction of the layer thickness could lead to a layer breakup phenomenon [46] and induce a deterioration of the desired barrier effect [47]. Besides, by analyzing the cooling DSC curves of the studied polymers (Fig.…”

Section: Orientationmentioning

confidence: 99%

Biodegradable PLA/PBS multinanolayer membrane with enhanced barrier performances

Messin

Marais

Follain

et al. 2020

Journal of Membrane Science

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Polyester multilayer membranes with more than 2000 alternating layers of poly(lactic acid) (PLA) and poly (butylene succinate) (PBS) were successfully prepared via a nanolayer coextrusion process equipped with a multiplying-element device. This process allows to make films consisting of very thin layers of polymers and in which a confinement effect of the semicrystalline polymer can be induced at point to significantly improve its physical properties. In this work, a homogeneous multinanolayer film of PLA/PBS was obtained without defaults or delamination, while the two polymers are immiscible. Continuous and homogeneous ultrathin layers of PBS (~45 nm) were obtained and the resulting confined structure of PBS led to an improvement of its barrier performances until 30% for oxygen, 40% for water and 70% for carbon dioxide. This improvement was explained by a decrease of the solubility coefficient and surprisingly not by the diffusion coefficient. This result was attributed to a slight orientation of the crystals in the extrusion direction and to the probable presence of an interphase between the layers of PLA and PBS.

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“…The coextrusion process of multinanolayered films can increase the number of layers in coextruded systems up to a few thousands while decreasing their thickness down to few nanometers [8,9] simultaneously, with the use of a large number N (∼10) of layer multiplying elements (LMEs). In multinanolayered films, the layer thickness becomes then comparable to the interphase one.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the rheological properties of multinanolayer films in the presence of compatibilized interphase

Beuguel

Guinault

Chinesta

et al. 2020

Journal of Rheology

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Rheological behavior of nanolayered films of polyethylene/polyamide 6 (PE/PA6) compatibilized in situ during the coextrusion process has been studied at a temperature between the melting temperatures of PE and PA6. Thanks to the high number of interfaces, a drastic increase in dynamic moduli has been measured when increasing the interphase volume fraction in the films, and a solid-like behavior for the interphase was identified. Different models are compared to capture the complex viscosity of nanolayered films as a function of angular frequency. A model considering interphase and bulk viscosities and a single fitting parameter, namely, the thickness over which the viscosity decreases linearly from the interphase to the bulk one, captures the complex viscosity of all samples. This thickness is comparable to the PE layer thickness up to values about 1 μm before a significant bulk region has to be added to capture the behavior for thicker layers. This suggests that the melt rheology is impacted by the presence of a nanometric interphase over very large (micronic) length scales.

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Existence of a Critical Layer Thickness in PS/PMMA Nanolayered Films

Cited by 47 publications

References 85 publications

Influence of outer-layer finite-size effects on the dewetting dynamics of a thin polymer film embedded in an immiscible matrix

Influence of outer-layer finite-size effects on the dewetting dynamics of a thin polymer film embedded in an immiscible matrix

Biodegradable PLA/PBS multinanolayer membrane with enhanced barrier performances

Modeling of the rheological properties of multinanolayer films in the presence of compatibilized interphase

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