Journal
MACROMOLECULES
Volume 53, Issue 10, Pages 3719-3727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.0c00217
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Funding
- National Science Foundation [DMR-1940518]
- DOE Office of Science [DE-AC02-06CH11357]
- ANR [ANR-10-IDEX-003-02, BRENNUS ANR-15-CE08-0024, ANR-10-LABEX-0042-AMADEUS]
- FRAE [BRENNUS ANR-15-CE08-0024, ANR-10-LABEX-0042-AMADEUS, IdEx ANR-10-IDEX-003-02]
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Porous elastomeric polymers have been used in a wide range of applications because of their unique characteristics such as biocompatibility, gas permeability, thermal stability, and hydrophobic and dielectric properties. Poly(dimethyl siloxane) (PDMS), a commercially available elastomer, has also been shown to exhibit specific acoustic properties. However, the material properties were limited because of a lack of control over the chemistry used to prepare the cross-linked PDMS elastomer. Here, the synthesis of PDMS-based polymerized medium internal-phase emulsions (polyMIPEs) with tunable storage shear moduli (G') has been performed using macromolecular thiol-ene reactions. Storage shear modulus values from similar to 38 to similar to 330 kPa were achieved by changing the stoichiometric ratio of the thiol-to-ene-functionalized PDMS, whereas the porosity of the polyMIPEs was controlled by the volume of the aqueous phase used in the emulsion formulation. Very low sound velocities (similar to 40 m/s) through the porous materials were recorded using acoustic characterization. Therefore, this work provides an example of the synthesis of soft polyMIPEs with possible applications as acoustic materials.
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