Organic chemistry

Covalent bond

Combinatorial chemistry

Relaxation (psychology)

Dynamic covalent chemistry

Operating system

Catalysis

Computational chemistry

Psychology

Chemistry

Alkyne

Acetal

Thiol

Molecule

Computer science

Linker

Thioacetal

Supramolecular chemistry

Polymer

Click chemistry

Social psychology

Angewandte Chemie International Edition

The design of covalent adaptable networks (CANs) relies on the ability to trigger the rearrangement of bonds within a polymer network. Simple activated alkynes are now used as versatile reversible cross‐linkers for thiols. The click‐like thiol–yne cross‐linking reaction readily enables network synthesis from polythiols through a double Michael addition with a reversible and tunable second addition step. The resulting thioacetal cross‐linking moieties are robust but dynamic linkages. A series of different activated alkynes have been synthesized and systematically probed for their ability to produce dynamic thioacetal linkages, both in kinetic studies of small molecule models, as well as in stress relaxation and creep measurements on thiol–yne‐based CANs. The results are further rationalized by DFT calculations, showing that the bond exchange rates can be significantly influenced by the choice of the activated alkyne cross‐linker.

Covalent Adaptable Networks with Tunable Exchange Rates Based on Reversible Thiol–yne Cross‐Linking