Porous materials with tunable mechanical properties

Ceglia, Gaétane; Merlin, Aurore; Viot, Philippe; Schmitt, Véronique; Mondain‐Monval, Olivier

doi:10.1007/s10934-014-9831-6

Cited by 10 publications

(8 citation statements)

References 25 publications

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“…UV was applied for typically 5 minutes to each face of the sample. The main advantage of the use of such UVpolymerizable fluids is that the rate of the polymerization is higher than the one achieved with thermocurable fluids 24,25 . Thus, this leads to polymerization times around 5 minutes for the monoliths, as compared to hours with thermally induced polymerization.…”

Section: Emulsion Characterizationmentioning

confidence: 99%

Soft Porous Silicone Rubbers as Key Elements for the Realization of Acoustic Metamaterials

Zimny

Merlin

et al. 2015

Langmuir

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In this work, macroporous materials made of polydimethylsiloxane, a soft silicone rubber, are prepared using UV polymerization with an emulsion-templating procedure. The porosity of the final materials can be precisely controlled by adjusting the volume of the dispersed phase. We show that the porous structure of the materials is the template of the droplets of the initial emulsions. Mechanical tests show that the materials Young's moduli decrease with the porosity of the materials. Acoustic measurements indicate that, in such a porous elastomeric matrix, the sound speed also decreases dramatically as soon as the porosity increases to attain values of as low as 80 m/s. The results are compared to earlier ones on silica aerogels and are interpreted within the framework of a simple theoretical approach. We show that the very low sound speed value is a consequence of the low value of the polymer shear modulus. This explains why such porous soft silicone rubbers are so efficient at playing the role of slow-soft resonators in acoustic metamaterials. Moreover, the fast rate of polymerization of such UV-curable fluid allows for a facile shaping of the final material as beads or rods in microfluidic devices.1.

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Section: Emulsion Characterizationmentioning

confidence: 99%

Soft Porous Silicone Rubbers as Key Elements for the Realization of Acoustic Metamaterials

Zimny

Merlin

et al. 2015

Langmuir

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“…Wong et al 48 have shown that, for cellular materials containing a bimodal void size distribution, there is an increase in modulus in comparison to the case of a uniform void size distribution. Also, the modulus of the struts themselves can be affected by the presence of a heterogeneous structure inside the walls as reported by Silverstein et al 49 and more recently by Maheo et al 37 and Ceglia et al 36 Moreover, for wet samples, water transport within the polyHIPE during mechanical testing may influence the results.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

The Effect of Shear on the Evolution of Morphology in High Internal Phase Emulsions Used as Templates for Structural and Functional Polymer Foams

Foudazi

Zhao

Gokun

et al. 2020

ACS Appl. Polym. Mater.

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Polymer foams have broad application as structural and functional materials in a variety of technological applications. Polymerization of monomers present in the continuous phase of water-in-oil high internal phase emulsions (HIPEs) provides a unique processing route for fabricating highly porous polymeric foams known as polyHIPEs. The microstructure of the polyHIPEs is related to the morphology of the HIPE from which it is templated. Shear-induced microstructural changes within the HIPE result from the combination of droplet breakup and coalescence induced by shear or thermal diffusion. HIPEs were prepared from a two-component oil phase consisting of 2-ethylhexyl acrylate (2-EHA) and ethylene glycol dimethacrylate monomers. Imaging of the HIPEs revealed shifts in the mean and polydispersity of the droplet size distribution with repeated shearing. Isothermal, oscillatory time-sweep chemorheological studies, conducted in the linear viscoelastic regime, were used to gain insights about the kinetics of polymerization as well as the morphological changes due to the thermal-induced droplet coalescence. The compressive modulus of wet polyHIPEs was found to increase with decreasing cell size and to decrease when coalescence occurred within the precursor HIPE. Thermal gravimetric analysis revealed an enhancement in the 2-EHA composition within the polymer compared to the original oil phase, presumably due to a difference in solubilities of the two monomer components into the aqueous phase.

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“…One explanation could be the decrease in plasticising effect of residual surfactant in S3 to S5 as discussed above. Moreover, the effect of pore size on the elastic moduli of the polyHIPEs has been reported by Maheo et al [43] and Ceglia et al [44,45]. The heterogeneous structure of pore walls (soft pore surface and a rigid core) causes polyHIPEs with large pores and thus small surface areas to possess higher elastic moduli.…”

Section: Resultsmentioning

confidence: 89%

Robust macroporous polymers: Using polyurethane diacrylate as property defining crosslinker

Jiang

Menner

Bismarck

2016

Polymer

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Porous materials with tunable mechanical properties

Cited by 10 publications

References 25 publications

Soft Porous Silicone Rubbers as Key Elements for the Realization of Acoustic Metamaterials

Soft Porous Silicone Rubbers as Key Elements for the Realization of Acoustic Metamaterials

The Effect of Shear on the Evolution of Morphology in High Internal Phase Emulsions Used as Templates for Structural and Functional Polymer Foams

Robust macroporous polymers: Using polyurethane diacrylate as property defining crosslinker

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