CuAAC-Based Click Chemistry in Self-Healing Polymers

• DOI: 10.1021/acs.accounts.7b00371
• Publication Date: 2017-09-11T14:22:30Z
• Authors: Diana Döhler; Philipp Michael; Wolfgang H. Binder
• Keywords: 01 natural sciences; 0104 chemical sciences

ConspectusClick chemistry has emerged as a significant tool for materials science, organic chemistry, and bioscience. Based on the initial concept of Barry Sharpless in 2001, copper(I)-catalyzed azide/alkyne cycloaddition (CuAAC) reaction triggered plethora chemical concepts linking molecules building blocks under ambient conditions, forming basis applications autonomous cross-linking materials. Self-healing systems other hand are often based mild chemistries that able to react either autonomously or upon an external trigger. In ideal case, self-healing takes place efficiently at low temperatures, independent substrate(s) used, by strong stable networks, binding newly generated (cracked) interfaces restore original material properties. The use CuAAC systems, most all careful design copper-based catalysts linked additives well diversity substrates, led enormous potential this singular reaction. implementation click-based strategies therefore is highly attractive, here (and physical) molecular reactivity, design, even metal catalysis connected aspects science. Account, we will show how reactions multivalent components can be used materials, achieving temperatures (exploiting autocatalysis internal chelation within bulk systematic optimization efficiency Cu(I) catalysts). Encapsulation separate click micro- nanoencapsulation required context. Consequently, examples reported describe realize more efficient faster polymeric Thus, enhanced chain diffusion (hyper)branched polymers, autocatalysis, enable already 5 °C with simultaneously reduced amount catalyst increased rates, culminating first system reactions. Via tailor-made nanocarbon/Cu(I) further improve view kinetics, leading generation graphene-based epoxy nanocomposites. Additionally, have designed special methods reporting visualization detection ruptured capsules via fluorogenic reaction, which combined obtain simultaneous stress similar concept, prepared Cu(I)–biscarbene complexes detect (mechanical) thus using destructive force constructive response.