Aperiodic “Bricks and Mortar” Mesophase: a New Equilibrium State of Soft Matter and Application as a Stiff Thermoplastic Elastomer

Abstract : A new thermodynamically stable, aperiodic “bricks-and-mortar” (B&M) cellular mesophase structure is reported in PS1-b-(PI-b-PS2)3 miktoarm copolymer and PS homopolymer blends [PS1, long polystyrene; PI, poly(isoprene); PS2, short polystyrene], where PS comprises discrete hard “bricks” and PI the continuous soft “mortar”. The mesophase is unique in its extreme domain volume fractions, its lack of positional order, and quasi-long-range orientational order. On the basis of this unusual mesophase structure, a series of PS-based thermoplastic elastomers are realized, combining rigidity from an exceptionally high content of discrete glassy PS domains (up to 82 wt %) and high extensibility with recoverable elasticity from a low content of continuous rubbery PI (down to 18 wt %). The new elastomers show sharp yielding behavior while maintaining good elasticity at large strains. Tensile-SAXS experiments reveal that voiding plays an important role for the mechanical behavior and voids can open/close reversibly with/without loading. Plastic deformation only results in a slight loss of recoverable elasticity.
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https://hal.archives-ouvertes.fr/hal-01447478
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Submitted on : Thursday, January 26, 2017 - 10:24:48 PM
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Weichao Shi, Andrew L. Hamilton, Kris T. Delaney, Glenn H. Fredrickson, Edward J. Kramer, et al.. Aperiodic “Bricks and Mortar” Mesophase: a New Equilibrium State of Soft Matter and Application as a Stiff Thermoplastic Elastomer. Macromolecules, American Chemical Society, 2015, 48 (15), pp.5378 - 5384. ⟨10.1021/acs.macromol.5b01210⟩. ⟨hal-01447478⟩

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