Vitrimers: permanent organic networks with glass-like fluidity

As an alternative to transesteri cation vitrimers, we recently explored vinylogous urethanes as a catalyst-free exchangeable group for vitrimers.17

Wim Denissen; Johan M. Winne; Filip E. Du Prez

2015

Scholarcy highlights

  • Thermosets are the materials of choice for numerous applications because of their dimensional stability, mechanical properties and creep/chemical resistance
  • An attractive chemical strategy to introduce plasticity in cross-linked polymer networks is offered by the introduction of exchangeable chemical bonds, leading to dynamic cross-links
  • For the design of vitrimer materials, it is important to consider the two transitions and their corresponding temperatures, Tg and Tv, which can be controlled through parameters such as the cross-link density, intrinsic rigidity of monomers, the exchange reaction kinetics, and the density of exchangeable bonds and groups
  • The vitrimeric properties of such ‘living’ polysiloxane networks remain to be explored, and thermal degradation seems to be an important issue in known systems, the associative nature of the covalent bond exchange reaction should allow for the design of new siloxane-based vitrimer materials
  • Di Stefano and co-workers have shown that even a minute amount of primary amines, which are very likely to be present in the polyimine network, induce very fast addition–elimination exchange reaction with imines
  • As the value of Tv indicates when vitrimers become processable but on the other hand lose their resistance to creep, nding exchange reactions with the right kinetics toward the application is one of the main challenges for vitrimer research. In this mini-review we show that several classical associative exchange reactions have already been used to design and produce vitrimers with unique properties
  • In contrast to dissociative CANs, vitrimers do not show thermoplastic behaviour at higher temperatures, and can not be regarded as a hybrid class that shows either thermoplastic or thermosetting properties depending on the temperature

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