Interfacially active particles in droplet/matrix blends of model immiscible homopolymers: Particles can increase or decrease drop size

Thareja, Prachi; Moritz, Kevin; Velankar, Sachin

doi:10.1007/s00397-009-0421-5

Cited by 62 publications

(39 citation statements)

References 33 publications

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“…) does not collapse even after 45 minutes under molten conditions although an increase in cell size is apparent. Addition of PTFE particles does not retard this increase in cell size, in fact it accelerates coalescence, an effect that has been noted previously in aqueous foams or in polymer blends . Similar results are seen for PP and polyolefin elastomer as well (Fig.…”

Section: Resultssupporting

confidence: 87%

Improving the stability of polylactic acid foams by interfacially adsorbed particles

Lobos

Iasella²,

Rodríguez‐Pérez

et al. 2015

Polymer Engineering & Sci

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Polymers such as poly(lactic acid) (PLA), which have poor melt strength, are difficult to foam due to severe cell coalescence during foaming. We show that addition of a few percent of polytetrafluoroethylene (PTFE) particles can stabilize PLA foams against bubble coalescence and collapse. The particles and a chemical blowing agent, were dispersed into the PLA by extrusion, and then foamed by heating. The PTFE‐containing foams remained stable even when the foams were held under molten conditions for extended periods. Foam stability is attributed to an interfacial mechanism: due to their low surface energy, the PTFE particles adsorb on the inner surface of the foam bubbles at a high surface coverage, and endow the bubbles with an interfacial “shell” that prevents coalescence. This mechanism resembles the particle‐stabilization of Pickering emulsions in oil/water systems. Particle adsorption at the interface is a necessary condition for using this approach, and hence this approach is most likely to be successful if the particles have a low surface energy and the polymer has a high surface tension. The approach of using interfacially adsorbed particles can be broadly generalized, and offers the opportunity of foaming various polymers with low melt strength, or for expanding the processing window within which foaming can be conducted. POLYM. ENG. SCI., 56:9–17, 2016. © 2015 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 87%

Improving the stability of polylactic acid foams by interfacially adsorbed particles

Lobos

Iasella²,

Rodríguez‐Pérez

et al. 2015

Polymer Engineering & Sci

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“…3a and c) occurs not when A and B have an equal volume, but instead when (f A 4 f B ). 44,45 Thus, particles make coalescence asymmetric: B-in-A Pickering emulsions coalesce much more readily than A-in-B Pickering emulsions. Thus, the particles affect phase inversion entirely via their interfacial activity.…”

Section: Partially-wetted Particlesmentioning

confidence: 99%

A non-equilibrium state diagram for liquid/fluid/particle mixtures

Velankar

2015

Soft Matter

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The equilibrium structures of ternary oil/water/surfactant systems are often represented within a triangular composition diagram with various regions of the triangle corresponding to different equilibrium states. We transplant this idea to ternary liquid/fluid/particle systems that are far from equilibrium. Liquid/liquid/particle mixtures or liquid/gas/particle mixtures yield a wide diversity of morphologies including Pickering emulsions, bijels, pendular aggregates, spherical agglomerates, capillary suspensions, liquid marbles, powdered liquids, and particle-stabilized foams. This paper argues that such ternary liquid/fluid/particle mixtures can be unified into a non-equilibrium state diagram. What is common among all these systems is that the morphology results from an interplay between the preferential wettability of the particles, capillarity, and viscous forces encountered during mixing. Therefore all such systems share certain universal features, regardless of the details of the particles or fluids used. These features guide the construction of a non-equilibrium state diagram which takes the form of a triangular prism, where each triangular cross-section of the prism corresponds to a different relative affinity of the particles towards the two fluids. We classify the prism into regions in which the various morphologies appear and also emphasize the major difference between systems in which the particles are fully-wetted by one of the fluids vs. partially-wetted by both fluids. We also discuss how the state diagram may change with mixing intensity or with interparticle attractions.

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“…The preferential localization of the nanoparticles at the interface between immiscible polymers is reported in the literature. [16][17][18][19] Such a behavior was found in systems containing layered silicates [16][17][18] and other inorganic nanoparticles (Fe, TiO 2 ). [19] However, the localization of the in situ formed metal nanoparticles at the interface in polymer blends is not reported in the literature to our knowledge.…”

Section: Morphology Of the Silver Nanocompositesmentioning

confidence: 99%

“…[16][17][18][19] Such a behavior was found in systems containing layered silicates [16][17][18] and other inorganic nanoparticles (Fe, TiO 2 ). [19] However, the localization of the in situ formed metal nanoparticles at the interface in polymer blends is not reported in the literature to our knowledge. In order to prove the identity of the nanoparticles, EDAX analysis of the layer at the PE/SAP interface was performed ( Figure 3).…”

Section: Morphology Of the Silver Nanocompositesmentioning

confidence: 99%

Silver Nanoparticles in Blends of Polyethylene and a Superabsorbent Polymer: Morphology and Silver Ion Release

Stara

Starý

Münstedt

2011

Macro Materials & Eng

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Antimicrobial properties of polymer materials are required in many applications. The polyethylene/superabsorbent polymer (PE/SAP) blends containing silver nanoparticles were successfully prepared via thermal reduction during melt mixing. It was found that in situ formed silver nanoparticles are preferentially located at the interface between PE matrix and SAP particles. The expectation was that the low water uptake of the PE will be enhanced by blending with a SAP and thus the silver ion release from the material will increase. Surprisingly, the silver ion release was markedly suppressed by the addition of SAP. This finding is explained by the preferential sorption of silver ions by the SAP particles. magnified image

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Interfacially active particles in droplet/matrix blends of model immiscible homopolymers: Particles can increase or decrease drop size

Cited by 62 publications

References 33 publications

Improving the stability of polylactic acid foams by interfacially adsorbed particles

Improving the stability of polylactic acid foams by interfacially adsorbed particles

A non-equilibrium state diagram for liquid/fluid/particle mixtures

Silver Nanoparticles in Blends of Polyethylene and a Superabsorbent Polymer: Morphology and Silver Ion Release

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