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...

Abstract “Click” chemistry represents one of the most powerful approaches for linking molecules in and materials science. Triggering this reaction by mechanical force would enable site‐ stress‐specific “click” reactions—a hitherto unreported observation. We introduce design realization a homogeneous Cu catalyst able to activate through when attached suitable polymer chains, acting as lever transmit central catalytic system. Activation subsequent copper‐catalyzed (CuAAC) is achieved either...

The development of high performance self-healing composites is still at an early stage due to the difficulty integrate mechanisms in their structure by applying current manufacturing processes. Here, authors propose structural resins based on dynamic hydrogen bonds capable overcome many industrial limitations. Hydrogen bonding moieties, such as barbiturate and thymine, able act reversible healing-elements simultaneous donor acceptor character, can be covalently linked multi-wall carbon...

Reversible Hydrogen Bonds (RHB) have been explored to confer self-healing function multifunctional nanocomposites. This study has carried out through a sequence of different steps. bonding moieties, with the intrinsic ability simultaneously perform functions both hydrogen donors and acceptors, covalently attached walls carbon nanotubes. The epoxy matrix modified adapt formulation for hosting mechanisms. It toughened percentages rubber phase linked precursor. most performant matrix, from...

The concept of self-healing polymers requires fast and efficient cross-linking processes, ideally based on catalytic reactions. We investigate autocatalytic effects in processes the copper(I)-catalyzed alkyne–azide "click" cycloaddition reaction (CuAAC), taking advantage 1,3-triazole rings formed during CuAAC-based cross-linking, which act as ligands for subsequent "click"-reactions turn accelerating rate CuAAC-reactions. Catalysis reactions multivalent polymeric alkynes azides (nine atactic...

Abstract Systematic investigations on the Cu(I)‐catalyzed “click” reaction between a three‐arm star polymer and low‐molecular‐weight alkynes are described. Liquid trivalent ( 2 – 7 ) reacted either with monovalent azidotelechelic polyisobutylene 1b $ \overline M_{\rm n} = 1900 g mol −1 , PDI 1.3) in solution, or 1a 4000 1.3). A significant autoacceleration is observed leading to increased rates of mono‐, di‐, trisubstituted alkynes. Reaction solvent‐free state proved be significantly faster...

Abstract “Click” chemistry represents one of the most powerful approaches for linking molecules in and materials science. Triggering this reaction by mechanical force would enable site‐ stress‐specific “click” reactions—a hitherto unreported observation. We introduce design realization a homogeneous Cu catalyst able to activate through when attached suitable polymer chains, acting as lever transmit central catalytic system. Activation subsequent copper‐catalyzed (CuAAC) is achieved either...

Purpose The purpose of this paper is to describe the first experiments manufacture self-healing carbon fiber reinforced panels (CFRPs) for realization structural aeronautic components in order address their vulnerability impact damage real service conditions. Design/methodology/approach developed system based on ring-opening metathesis polymerizations reaction microencapsulated 5-ethylidene-2-norbornene/dicyclopentadiene cyclic olefins using Hoveyda-Grubbs’ generation catalyst as initiator....

Abstract Strategies for visualizing stress within polymeric materials are of growing interest during the past decade. In this paper, stress‐sensing materials, triggered by a mechanoresponsive catalytic system based on latent copper(I)bis( N ‐heterocyclic carbene) mechanophores, reported, which can be activated compression force to trigger fluorogenic copper(I)‐catalyzed alkyne/azide “click” cycloaddition reaction, activating fluorescent dye useful applications in bulk materials. The focus is...

We report on copper(<sc>i</sc>)-bis(<italic>N</italic>-heterocyclic carbene)s (NHC) for quantitative stress-sensing. This mechanophore is embedded within a polyurethane network, triggering fluorogenic copper(<sc>i</sc>) azide alkyne cycloaddition (CuAAC) of 8-azido-2-naphtol and 3-hydroxy phenylacetylene.

ABSTRACT In this paper, the synthesis and characterization of a series latent polymeric bis( N ‐heterocyclic carbene) (NHC) copper(I) complexes is reported, which can be activated for copper(I)‐catalyzed azide/alkyne cycloaddition (CuAAC) via ultrasound. To prove influence chain length nature polymer towards activation, poly(isobutylene) (PIB), poly(styrene) (PS) poly(tetrahydrofuran) (PTHF) are synthesized living polymerization techniques (LCCP, ATRP, CROP) obtaining different lengths (from...

Self-healing polymer coatings are an emerging class of smart materials. Upon mechanical damage the material properties may be restored by self-healing, which can triggered externally, e.g., increased temperature. An alternative approach relies on embedding capsules with repair agents into polymers, rupture is induced damage, and release triggers self-repair reaction. The work at hand presents in situ Raman spectroscopic investigations reaction dynamics such self-healing coatings. Analysis...

With the class of shock-absorbing proteins, nature created some most robust materials combining both mechanical strength and elasticity. Their excellent ability to dissipate energy prevent surrounding cells from damage is an interesting property that regularly exploited for applications in biomimetic materials. Similar biomaterials, where stimuli are transmitted into a (bio)chemical response, mechanophoric catalysts transform chemical reaction. Force transmission realized commonly by...

Abstract Porous coordination polymers, more commonly known as metal‐organic frameworks (MOFs), are constructed from metal ions and organic linkers which form a robust network‐like structure similar to very dense polymeric networks. In this work the mechanochemical activation of MOF is reported, based on previous results latent Cu(I)‐based N ‐heterocyclic carbenes (NHCs) embedded covalently in various polymers. A mechanochemically triggered copper‐catalyzed azide‐alkyne cycloaddition (CuAAC)...

Novel PS-based mechanophores of linear and chain-extended architecture are synthesized obtaining bis(NHC) complexes with more than one Cu(<sc>i</sc>) center per chain molecular weights up to 50 000 g mol⁻¹.

A big step forward for composite application in the sector of structural materials is given by use Multi-Wall Carbon Nanotubes (MWCNTs) functionalized with hydrogen bonding moieties, such as barbiturate and thymine, to activate self-healing mechanisms integrate additional functionalities. These multiple healing properties at same damaged site, imparted bonds, will also have potential improve material reliability, extend service life, reduce replacement costs, product safety. This...

Abstract Monitoring polymer degradation is an important quest, particularly relevant for industry. Although many indirect methodologies assessing exist, only few are applicable inline‐monitoring via optic detection‐systems. An system introduced the thermal of crosslinked poly(ester imide)s (PEIs) by embedding trifluoroacetyl functionalized stilbene molecules, serving as chemosensors to track release generated alcoholic byproducts. Nucleophilic addition alcohol sensors functionality triggers...

Front Cover: Supramolecular polymers as self-healing materials: noncovalent, transient bonds generate reversible, dynamic networks, able to heal a physically damaged site multiple times. Concepts and examples of based on hydrogen bonds, π–π interactions, ionomers, coordinative are discussed. Further details can be found in the article by F. Herbst, D. Dohler, P. Michael, W. H. Binder* page 203.

Functionalized multi-wall carbon nanotubes (MWCNTs) have been embedded in a rubber-toughened epoxy formulation order to explore the possibility impart an auto-repair function matrix. The nanofiller has covalently functionalized with hydrogen bonding moieties able act as donor and acceptor of bondings. Healing efficiencies evaluated for nano charged formulations at loading 0.5% wt/wt MWCNTs bearing barbituric acid thymine-based ligands. For both performed functionalizations, self-healing...

Single-molecule force spectroscopy allows investigation of the effect mechanical on individual bonds. By determining forces necessary to sufficiently activate bonds trigger dissociation, it is possible predict behavior mechanophores. The a copper biscarbene mechano-catalyst intended for self-healing materials was measured. using safety line bypassing mechanophore, pinpoint dissociation investigated bond and determine rupture range from 1.6 2.6 nN at room temperature in dimethyl sulfoxide....

Abstract Here, a mechanochemically triggered Cu(I) bis( N ‐heterocyclic carbene [NHC))‐based metal–organic framwork (MOF) embedded into thermoplastic polyurethane (TPU)‐matrix is reported. The induced fluorogenic copper‐catalyzed azide–alkyne cycloaddition (CuAAC) reveals the stressed parts within PU via simple optical detection. As determined oscillating tensile rheology on dumbbell‐shaped samples of TPU, MOF, containing 4.66% copper, catalyzes CuAAC between nonfluorescent precursor dyes,...