The interface dynamics of bicontinuous phase separating structure in a polymer blend

Saito, Hayate; Yoshinaga, Masahiro; Mihara, Takaaki; Nishi, Toshio; Jinnai, Hiroshi

doi:10.1088/1742-6596/184/1/012029

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Lately somewhat more complex structures were found such as bicontinuous gyroid structures for AB diblock copolymers, , tricontinuous gyroid structures, , a hexagonal core–shell morphology, and a core–shell gyroid structure for linear three-component triblock terpolymers of the ABC type; furthermore, the very periodic cubic structure in (AB) n -star and hierarchical structures in three-component multiblock terpolymers have been known to show new morphological features. All these structures show periodic morphologies with mesoscopic length scales; however, in some cases, such as gyroid structures, their mean curvatures are not really constant as precisely reported for a two-component system …”

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confidence: 66%

“…All these structures show periodic morphologies with mesoscopic length scales; however, in some cases, such as gyroid structures, their mean curvatures are not really constant as precisely reported for a two-component system. 16 If diblock copolymer systems possess certain polydispersity, generally speaking, it still conforms simple and periodic structures as the result of spontaneous and uniform mixing of different chains. Hashimoto et al studied the morphologies of binary mixtures of poly(styrene-b-isoprene) (SI) with different composition, 17 while Hillmyer et al investigated polydispersity effect on morphology of poly(ethylene-alt-propylene)-blockpoly(DL-lactide) (PEP-PLA).…”

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confidence: 99%

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Formation of Tetragonally-Packed Rectangular Cylinders from ABC Block Terpolymer Blends

Asai

Yamada

et al. 2014

ACS Macro Lett.

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Effect of composition distribution of ABC linear terpolymers on the formation of periodic structures was investigated. Five poly(isoprene-b-styrene-b-2-vinylpyridine) (ISP) triblock terpolymers with almost constant molecular weights of ca. 130k and with similar center-block fraction at around 0.55, were blended variously. It has been found that tricontinuous gyroid structures gradually transform into a cylindrical structure whose rectangular cylinders are packed tetragonally if composition distribution increases. Further experiments by 3D-TEM observation on binary equimolar mixtures of two molecules with similar molecular weights of 122k and 124k, giving the average composition of φI/φS/φP = 0.23/0.59/0.18, has verified to show more evident rectangular-shaped cylinders with 4-fold symmetry. This new structure, having periodic surfaces with nonconstant mean-curvature, could be formed due to the systematic localization of component polymer chains along the domain interfaces.

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confidence: 66%

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confidence: 99%

Formation of Tetragonally-Packed Rectangular Cylinders from ABC Block Terpolymer Blends

Asai

Yamada

et al. 2014

ACS Macro Lett.

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“…These are covalently bound to the PLA chains on the PLA side and physically interact on the LLDPE side through the ethylene segments of EMA-GMA . These interactions can reduce the interfacial energy and alter the dynamics of interface and the pressure difference across the interface which can consequently result in the formation of smaller interconnected domains. − …”

Section: Resultsmentioning

confidence: 99%

Toughening of Cocontinuous Polylactide/Polyethylene Blends via an Interfacially Percolated Intermediate Phase

Zolali

Favis

2018

Macromolecules

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It will be shown that an interfacially percolated rubbery phase in a cocontinuous polylactide (PLA)/linear low-density polyethylene (LLDPE) blend results in a significant increase in the impact strength. All blends possess a tricontinuous phase morphology in which poly(ε-caprolactone) (PCL), poly(ethylene–methyl acrylate) (EMA), and ethylene–methyl acrylate–glycidyl methacrylate (EMA-GMA) percolate at the interface of PLA/LLDPE but offer different toughening and compatibilization effects. Among these components, the addition of EMA-GMA to the binary PLA/LLDPE blend reduces the cocontinuous PLA/LLDPE phase thickness from about 25 to 5 μm and yields a very tough material with an impact strength of about 515 J/m, which is approximately 13 times greater than the original cocontinuous PLA/LLDPE blend and more than 32 times that of PLA. The ternary blends show significant improvements in the impact strength within the tricontinuous region; however, the principal differences in the toughening effects are attributed to interfacial interactions between the phases. The interconnected network of the rubbery phase is expected to percolate the stress field throughout the tricontinuous system and reduce the detrimental dilatational stress in the bulk blend.

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“…16 More recently, a topological analysis has elucidated the mechanisms at play during the phase separation of the polymers. 22 In this paper, we systematically characterize a range of W/L bijel samples by using 3D confocal microscopy data and a commercially available image analysis package; we benchmark our analysis by using X-ray CT data (with improved statistics over confocal) and simulated data of idealized structures. We measure distributions of interfacial curvatures, and then compute areaaveraged quantities in order to characterize the topology of the structures as a function of particle size, quench rate, and time after bijel formation.…”

Section: Introductionmentioning

confidence: 99%

Quantitative morphological characterization of bicontinuous Pickering emulsions via interfacial curvatures

2016

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Bicontinuous Pickering emulsions (bijels) are a physically interesting class of soft materials with many potential applications including catalysis, microfluidics and tissue engineering. They are created by arresting the spinodal decomposition of a partially-miscible liquid with a (jammed) layer of interfacial colloids. Porosity L (average interfacial separation) of the bijel is controlled by varying the radius (r) and volume fraction (ϕ) of the colloids (L∝r/ϕ). However, to optimize the bijel structure with respect to other parameters, e.g. quench rate, characterizing by L alone is insufficient. Hence, we have used confocal microscopy and X-ray CT to characterize a range of bijels in terms of local and area-averaged interfacial curvatures; we further demonstrate that bijels are bicontinuous using an image-analysis technique known as 'region growing'. In addition, the curvatures of bijels have been monitored as a function of time, which has revealed an intriguing evolution up to 60 minutes after bijel formation, contrary to previous understanding.

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The interface dynamics of bicontinuous phase separating structure in a polymer blend

Cited by 6 publications

References 17 publications

Formation of Tetragonally-Packed Rectangular Cylinders from ABC Block Terpolymer Blends

Formation of Tetragonally-Packed Rectangular Cylinders from ABC Block Terpolymer Blends

Toughening of Cocontinuous Polylactide/Polyethylene Blends via an Interfacially Percolated Intermediate Phase

Quantitative morphological characterization of bicontinuous Pickering emulsions via interfacial curvatures

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