Particle-induced bridging in immiscible polymer blends

Thareja, Prachi; Velankar, Sachin

doi:10.1007/s00397-006-0130-2

Cited by 74 publications

(38 citation statements)

References 16 publications

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“…However, the solid‐like behavior observed in the PLA/EMA‐GMA/C20A (82.5/12.5/5) system must be attributed not only to particle–particle or particle–polymer interactions but also to the formation of a tridimensional network of neighboring droplets, cocontinuous EMA‐GMA phase, that do not coalesce due to the presence of the clay . Thareja and Velankar proposed that particles added to a blend of immiscible polymers can bridge across drops and glue them together which significantly affect the rheological properties of the blend. Although particles can cause solid‐like behavior in blends, this behavior can be found in the absence of any drop phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of combining ethylene/methyl acrylate/glycidyl methacrylate terpolymer and an organoclay on the toughening of poly(lactic acid)

Brito

Agrawal

Araújo

et al. 2013

Polymer Engineering & Sci

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Blends of poly(lactic acid) (PLA) and ethylene/methyl acrylate/glycidyl methacrylate terpolymer (EMA-GMA) with and without the addition of an organoclay were prepared by melt mixing in a twin screw extruder. Mechanical, morphological, structural, and rheological properties of the systems have been investigated as function of its compositions. The impact strength (IS) of PLA increased with the addition of EMA-GMA. Furthermore, the addition of 2.5 wt% of organoclay to the PLA/EMA-GMA blend promoted improvements in the mechanical properties, such as IS, tensile strength, and strain-at-break. Further addition of organoclay, 5 wt%, led to a formation of a double percolated network, where the clay particles form bridges across EMA-GMA droplets and glue them together, however, without coalescence. In addition, morphological and wide-angle X-ray scattering analyses evidenced that the clay presents a partially exfoliated structure and that remains inside the EMA-GMA droplets, probably as a consequence of the approach used to produce the systems.

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Section: Resultsmentioning

confidence: 99%

Effect of combining ethylene/methyl acrylate/glycidyl methacrylate terpolymer and an organoclay on the toughening of poly(lactic acid)

Brito

Agrawal

Araújo

et al. 2013

Polymer Engineering & Sci

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“…The underlying mechanism, however, remains unclear. Filler‐induced bridging has been observed in immiscible blends of liquid polymers at room temperature filled with fumed silica 10, 11. The phenomenon has been explained by invoking equilibrium contact angle conditions, which must be fulfilled when the particles simultaneously adsorb at two liquid/liquid interfaces.…”

Section: Discussionmentioning

confidence: 99%

Clustering of Coated Droplets in Clay‐Filled Polymer Blends

Filippone

Acierno

2012

Macro Materials & Eng

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The selective positioning of clay platelets at the polymer/polymer interface in a blend with drop/matrix morphology has a contrasting effect: on the one hand, it promotes a refinement of the morphology during the intense flows which occur during melt compounding; on the other hand, it induces coarsening in the course of prolonged slow flows experienced during rheological analysis. Rather than to a usual coalescence process, the increase of the average sizes of the dispersed phase is primarily due to a clustering mechanism of clay-coated droplets, which keep their individuality inside the clusters because of the elastic connotation of the layered interface

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“…It was argued that the reasons for the preferential migration of silica to ENR phase included the low viscosity of the ENR and physical interactions between the epoxide group of ENR and the silanol group of silica. Another study by Thareja and Velankar32 showed that the addition of fumed silica nanoparticles in PDMS/PIB blends can induce clustering of the drops and consequently stabilize droplets coalescence. Actually, the mechanism by which silica nanoparticles stabilize the morphology against coalescence is not fully understood yet.…”

Section: Introductionmentioning

confidence: 99%

Morphology Development in Novel Composition of Thermoplastic Vulcanizates Based on PA12/PDMS Reactive Blends

Mani

Cassagnau

Bousmina

et al. 2011

Macro Materials & Eng

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International audienceThe main objective of the present work was to tailor a new thermoplastic vulcanisate (TPV) composed of PA 12 as the thermoplastic phase and PDMS as the rubber phase. The PDMS was crosslinked by dicumyl peroxide (DCP). Interestingly, addition of 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) to the TPV provided the compatibilization of the PA12/PDMS blend in the dynamic process and gave a new material with control structure and morphology. The electron microscopy (SEM and TEM) studies revealed that adding silica nanoparticles and Lotader in PA12 and PDMS phases, respectively, led to a drastic reduction in R(v) of the PDMS particles from 16.5 mu m(virgin blend) to nearly 0.6 mu m for the PA12/PDMS reactive blend. Therefore, a stable co-continuous morphology was obtained for the new TPV based on 60-40 wt.-% of PDMS-PA12 blend

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Particle-induced bridging in immiscible polymer blends

Cited by 74 publications

References 16 publications

Effect of combining ethylene/methyl acrylate/glycidyl methacrylate terpolymer and an organoclay on the toughening of poly(lactic acid)

Effect of combining ethylene/methyl acrylate/glycidyl methacrylate terpolymer and an organoclay on the toughening of poly(lactic acid)

Clustering of Coated Droplets in Clay‐Filled Polymer Blends

Morphology Development in Novel Composition of Thermoplastic Vulcanizates Based on PA12/PDMS Reactive Blends

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