Controlling the order of triblock copolymer via confinement induced by forced self-assembly

Roland, Sébastien; Miquelard‐Garnier, Guillaume; Gervais, Matthieu; Guinault, Alain; Sollogoub, Cyrille

doi:10.1016/j.mtcomm.2015.11.003

Cited by 11 publications

(12 citation statements)

References 40 publications

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“…Long-range order within the confined layers is achieved (and can be to some extent controlled via the processing parameters) on large scales of material through an industrially relevant process, similar to previous studies [42e44, 46,51]. More surprisingly and rarely observed experimentally (and to the best of our knowledge for the first time in a materials engineering context), it is shown that nanolayer coextrusion favors through shearing and "soft" confinement a cylindrical morphology over a lamellar one more thermodynamically favored.…”

Section: Introductionsupporting

confidence: 82%

“…Nanolayer coextrusion has been developed in our lab [47e50] and also used recently to confine an asymmetric BCP poly(styreneb-butadiene-b-methyl methacrylate) (SBM) with an incompatible matrix (polycarbonate PC) [51]. It was shown that as the triblock layer thickness decreases and the draw ratio increases, the triblock morphology is constrained into a preferential orientation and higher long-range order is observed [51].…”

Section: Introductionmentioning

confidence: 99%

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From equilibrium lamellae to out-of-equilibrium cylinders in triblock copolymer nanolayers obtained via multilayer coextrusion

Montana

Roland

Richaud

et al. 2018

Polymer

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tMultilayer coextrusion was used to obtain nanolayered films of self-assembled commercial triblock copolymer poly(methyl methacrylate-b-butyl acrylate-b-methyl methacrylate) (MAM) confined by poly(methyl methacrylate) (PMMA). The MAM layer thickness was varied from 30 nm to 500 nm (i.e. roughly 1 to 15e20 nanodomains) by changing either the number of multiplying elements or the chill roll draw ratio. The as-extruded triblock morphology within the layers was identified as cylindrical using transmission electronic microscopy (TEM) and small-angle X-ray scattering (SAXS). Surprisingly, this differs from the lamellar morphology identified at equilibrium in bulk and thin films for this triblock. Moreover, as the triblock layer thickness is decreased, the triblock morphology is constrained into a preferential orientation. Slightly different packings were observed on films with similar layer thicknesses but achieved with different processing routes. This one-step and industrially scalable method allowing long-range control of the self-assembly is of interest for engineering applications with large quantity of materials needed.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

From equilibrium lamellae to out-of-equilibrium cylinders in triblock copolymer nanolayers obtained via multilayer coextrusion

Montana

Roland

Richaud

et al. 2018

Polymer

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“…3239197; Tollar, ), this process was thoroughly investigated by Baer's group to study nanoscale polymer interactions (Liu et al ., ) and produce films with unique optical properties (Kazmierczak et al ., ), as well as enhanced mechanical (Kerns et al ., ) or gas barrier properties (Wang et al ., ). In our laboratory, the process has been recently used to control the architecture at the micro‐/nanoscale of multiphase polymer systems, like polymer blends (Boufarguine et al ., ), nanocomposites (Miquelard‐Garnier et al ., ; Li et al ., ) or triblock copolymers (Roland et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Evaluation of morphological representative sample sizes for nanolayered polymer blends

Bironeau

Dirrenberger

Sollogoub

et al. 2016

Journal of Microscopy

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The size of representative microstructural samples obtained from atomic force microscopy is addressed in this paper. The case of an archetypal one-dimensional nanolayered polymer blend is considered. Image analysis is performed on micrographs obtained through atomic force microscopy, yielding statistical data concerning morphological properties of the material. The variability in terms of microstructural morphology is due to the thermomechanical processing route. The statistical data is used in order to estimate sample size representativity, based on an asymptotic relationship relating the inherent point variance of the indicator function of one material phase to the statistical, size-dependent, ensemble variance of the same function. From the study of nanolayered material systems, the statistical approach was found to be an effective mean for discriminating and characterizing multiple scales of heterogeneity.

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“…The process was also developed in our lab in order to control the architecture at the micro-/nanoscale of multiphase polymer systems, like polymer blends, 22 nanocomposites 23,24 or triblock copolymers. 25 However, in some cases, it has been observed that below a certain layer thickness, the layers tend to lose their integrity, i.e. they break spontaneously during the process.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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An experimental study was carried out to investigate the existence of a critical layer thickness in nanolayer coextrusion, under which no continuous layer is observed. Polymer films containing thousands of layers of alternating polymers with individual layer thicknesses below 100 nm have been prepared by coextrusion through a series of layer multiplying elements. Different films composed of alternating layers of poly(methyl methacrylate) (PMMA) and polystyrene (PS) were fabricated with the aim to reach individual layer thicknesses as small as possible, varying the number of layers, the

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Controlling the order of triblock copolymer via confinement induced by forced self-assembly

Cited by 11 publications

References 40 publications

From equilibrium lamellae to out-of-equilibrium cylinders in triblock copolymer nanolayers obtained via multilayer coextrusion

From equilibrium lamellae to out-of-equilibrium cylinders in triblock copolymer nanolayers obtained via multilayer coextrusion

Evaluation of morphological representative sample sizes for nanolayered polymer blends

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

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