Influence of the molar masses on compatibilization mechanism induced by two block copolymers in PMMA/PS blends

Genoyer, Julie; Soulestin, J.; Demarquette, Nicole R.

doi:10.1122/1.5009047

Cited by 10 publications

(16 citation statements)

References 32 publications

(66 reference statements)

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“…Coalescence tests were carried out following the procedure described in indicating that the size of the droplets increases and coalescence is happening [42]. The same observations were made for all the blends.…”

Section: Fig 6 Thermogravimetric Analysis Of Pmma To Which 5 % Of Mmtmentioning

confidence: 99%

“…During the coalescence tests, the interfacial tension is considered to be constant. For a more detailed discussion of this assumption, see paper [42]. Then for each strain, Rv can be determined using the values of α determined at strain = 0 (TABLE III) as well as the τF determined on the relaxation spectra in equation 3.…”

Section: Fig 6 Thermogravimetric Analysis Of Pmma To Which 5 % Of Mmtmentioning

confidence: 99%

“…Marangoni's relaxation is faster for smaller nanoparticles but a fast Marangoni effect is not enough to ensure coalescence inhibition. The nanoparticles must also be big enough or numerous enough to induce enough barrier effect, the same way a block copolymer as a compatibilizer needs to induce enough steric hindrance to be efficient [42].…”

Section: Fig 10 Morphology Of Pmma/ps Blends With Addition Of ML Mmmmentioning

confidence: 99%

“…Indeed, the molar mass of the block copolymer must be high enough to induce steric hindrance as well, or else coalescence is not affected [42]. It was also shown using rheology that…”

Section: Introductionmentioning

confidence: 98%

“…This was elegantly proved in the case of block copolymer by Jeon and Macosko [41] who visualized fluorescent PS-PMMA block copolymer concentration gradients, during flow at the surface of a PMMA droplet in a PS matrix. However, Genoyer et al [42] showed that in the case of block copolymers, Marangoni stresses alone cannot prevent coalescence.…”

Section: Introductionmentioning

confidence: 99%

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Effect of clay particles size and location on coalescence in PMMA/PS blends

Genoyer

Demarquette

Soulestin

2019

Journal of Rheology

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The addition of 6 different clays (laponite, montmorillonite, halloysite and their organomodified counterparts) to poly(methyl methacrylate) (PMMA), polystyrene (PS) and their blends was studied. The morphologies of the obtained composites were studied using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Small angle oscillatory shear (SAOS) experiments, as well as, shear induced coalescence tests were carried out to evaluate the role of the clay as a coalescence inhibitor. Using the six different clays enabled the evaluation of the effect of clay location and clay platelet size for a given location (matrix, dispersed phase, interphase) on the coalescence phenomenon. A decrease of the dispersed phase of the blend was generally observed upon the addition of clay. Clays located exclusively in the matrix (laponite, montmorillonite, halloysite and modified halloysite) were shown to migrate to the interface during coalescence tests, inducing a decrease of coalescence at a certain extent of migration. Modified montmorillonite, located at the interface, was the most efficient clay at inhibiting coalescence, due to relaxation of Marangoni stresses with an important barrier effect. Overall, it was shown that having a certain size of a nanoparticle is essential for it to locate at the interface and inhibit coalescence. Nanoparticles with a larger size than the droplets are not able to locate at the interface and therefore, do not have an effect on coalescence. Conversely, nanoparticles whose size is 10 % or less of the droplet, were found to be well dispersed in the whole blend. These particles did not have a preferred location nor had an effect on coalescence.

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Section: Fig 6 Thermogravimetric Analysis Of Pmma To Which 5 % Of Mmtmentioning

confidence: 99%

Section: Fig 6 Thermogravimetric Analysis Of Pmma To Which 5 % Of Mmtmentioning

confidence: 99%

Section: Fig 10 Morphology Of Pmma/ps Blends With Addition Of ML Mmmmentioning

confidence: 99%

“…Indeed, the molar mass of the block copolymer must be high enough to induce steric hindrance as well, or else coalescence is not affected [42]. It was also shown using rheology that…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of clay particles size and location on coalescence in PMMA/PS blends

Genoyer

Demarquette

Soulestin

2019

Journal of Rheology

Self Cite

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Influence of PMMA brushes grafted from GO on rheological properties of PMMA/SAN immiscible blend in shear and elongation flow

Ilčíková

Galeziewska

Kolarik

et al. 2023

Polymer

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Understanding the Rheology of Polymer–Polymer Interfaces Covered with Janus Nanoparticles: Polymer Blends versus Particle Sandwiched Multilayers

et al. 2023

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Interfacial rheology is crucial in dictating morphology and ultimate properties of particle-stabilized polymer blends, but is challenging to be determined. In this study, a fully polymeric dumbbell-shaped Janus nanoparticle (JNP) of polymethyl methacrylate (PMMA) and polystyrene (PS) spheres with equal sizes (∼80 nm) was prepared and used as an efficient compatibilizer for PMMA/PS blends. The JNPs were preferentially localized at the PMMA/PS interface, thereby reducing the interfacial tension and refining the morphology in both droplet-matrix and co-continuous type blends, whereby a JNP concentration ∼2.5 wt % is sufficient to reach a saturation in droplet size reduction due to compatibilization. Based on the linear viscoelastic moduli and corresponding relaxation spectra (H(τ)*τ) of JNP-compatibilized droplet-matrix blends, besides the droplet shape relaxation time (τF), a longer relaxation time (τβ), typically related to interfacial viscoelasticity, was readily identified. The dependence of τβ on the JNP concentration (W JNPs) was significantly dominated by the droplet size reduction induced by the JNP compatibilization, with τβ decreasing with increasing W JNPs. The viscoelastic properties extracted from τβ typically originate from a combination of gradients in interfacial tension due to the particle redistribution at the droplet interface (Marangoni stresses) and the deviatoric stresses of intrinsic rheological origin. The latter originate from the intrinsic viscoelasticity of the particle-laden interface, which is enhanced by particle jamming and particle–polymer interactions, such as entanglements between chains from the polymeric spheres and those penetrating from the bulk into the spheres. To address the challenge of isolating these contributions, a JNP-sandwiched PMMA/PS multilayer structure was designed to exclude the effect of Marangoni stresses and droplet curvature, thus having no τF but a new relaxation (τ′β), which characterizes the contribution of intrinsic interfacial viscoelasticity. The τ′β was observed to increase with JNP coverage (Σ) following the Vogel–Fulcher–Tammann model that is typically used to describe the divergent behavior of the “cage” effect in classical colloidal glasses. Moreover, a multimode Maxwell model fitting allows to split the interfacial relaxation into the confined diffusion of JNPs within their cage and the entanglements between the JNPs and the bulk.

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Influence of the molar masses on compatibilization mechanism induced by two block copolymers in PMMA/PS blends

Cited by 10 publications

References 32 publications

Effect of clay particles size and location on coalescence in PMMA/PS blends

Effect of clay particles size and location on coalescence in PMMA/PS blends

Influence of PMMA brushes grafted from GO on rheological properties of PMMA/SAN immiscible blend in shear and elongation flow

Understanding the Rheology of Polymer–Polymer Interfaces Covered with Janus Nanoparticles: Polymer Blends versus Particle Sandwiched Multilayers

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