TY  - JOUR
A1  - Eckert, Alexander
A1  - Rudolph, Tobias
A1  - Guo, Jiaqi
A1  - Mang, Thomas
A1  - Walther, Andreas
T1  - Exceptionally Ductile and Tough Biomimetic Artificial Nacre with Gas Barrier Function
JF  - Advanced Materials
N2  - Synthetic mimics of natural high-performance structural materials have shown great and partly unforeseen opportunities for the design of multifunctional materials. For nacre-mimetic nanocomposites, it has remained extraordinarily challenging to make ductile materials with high stretchability at high fractions of reinforcements, which is however of crucial importance for flexible barrier materials. Here, highly ductile and tough nacre-mimetic nanocomposites are presented, by implementing weak, but many hydrogen bonds in a ternary nacre-mimetic system consisting of two polymers (poly(vinyl amine) and poly(vinyl alcohol)) and natural nanoclay (montmorillonite) to provide efficient energy dissipation and slippage at high nanoclay content (50 wt%). Tailored interactions enable exceptional combinations of ductility (close to 50% strain) and toughness (up to 27.5 MJ m⁻³). Extensive stress whitening, a clear sign of high internal dynamics at high internal cohesion, can be observed during mechanical deformation, and the materials can be folded like paper into origami planes without fracture. Overall, the new levels of ductility and toughness are unprecedented in highly reinforced bioinspired nanocomposites and are of critical importance to future applications, e.g., as barrier materials needed for encapsulation and as a printing substrate for flexible organic electronics.
Y1  - 2018
U6  - http://dx.doi.org/10.1002/adma.201802477
VL  - 30
IS  - 32
SP  - Article number 1802477
PB  - Wiley-VCH
ER  -