Hierarchical Nacre Mimetics with Synergistic Mechanical Properties by Control of Molecular Interactions in Self-Healing Polymers

Zhu, B., Jasinski, N., Benitez, A., Noack, M., Park, D., Goldmann, A. S., Barner-Kowollik, C., & Walther, A. (2015) Hierarchical Nacre Mimetics with Synergistic Mechanical Properties by Control of Molecular Interactions in Self-Healing Polymers. Angewandte Chemie - International Edition, 54(30).

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Designing the reversible interactions of biopolymers remains a grand challenge for an integral mimicry of mechanically superior biological composites. Yet, they are the key to synergistic combinations of stiffness and toughness by providing sacrificial bonds with hidden length scales. To address this challenge, dynamic polymers were designed with low glass-transition temperature Tg and bonded by quadruple hydrogen-bonding motifs, and subsequently assembled with high-aspect-ratio synthetic nanoclays to generate nacre-mimetic films. The high dynamics and self-healing of the polymers render transparent films with a near-perfectly aligned structure. Varying the polymer composition allows molecular control over the mechanical properties up to very stiff and very strong films (E≈45 GPa, σUTS≈270 MPa). Stable crack propagation and multiple toughening mechanisms occur in situations of balanced dynamics, enabling synergistic combinations of stiffness and toughness. Excellent gas barrier properties complement the multifunctional property profile. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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ID Code: 99451
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :12
Export Date: 5 September 2016
Chemicals/CAS: Nacre; Polymers
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Keywords: bioinspired materials, crack propagation, nacre mimetics, sacrificial bonds, toughness, Aspect ratio, Biopolymers, Cracks, Gas permeable membranes, Gems, Glass bonding, Glass transition, Hydrogen bonds, Mechanical properties, Nanocomposites, Polymer films, Self-healing materials, Stiffness, Bio-inspired materials, Low glass transition temperatures, Mimetics, Multifunctional properties, Quadruple hydrogen bonding, Reversible interactions, Synergistic combinations, Polymers, biomimetic material, nacre, polymer, biomimetics, chemistry, hydrogen bond, mechanics, transition temperature, Biomimetic Materials, Hydrogen Bonding, Mechanical Phenomena
DOI: 10.1002/anie.201502323
ISSN: 14337851
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Sep 2016 04:50
Last Modified: 26 Sep 2016 03:06

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