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Orientador(es)
Resumo(s)
Novel results concerning the inverse vulcanization of sulfur using reversible addition–fragmentation chain transfer (RAFT)
polymerization are here reported. It is shown that RAFT polymerization can be used to carry out this cross-linking process, with the
additional possibility to extend the reaction time from a few minutes as with classical free radical polymerization (FRP) to several
hours. Higher control on viscosity and processability of the synthesized networks, as well as, the implementation of semibatch feed
policies during cross-linking are important advantages of the RAFT process here explored comparatively to the FRP inverse vulcanization.
Using cyclic voltammetry, it was assessed the electrochemical activity of the synthesized sulfur-rich polymer networks. It is
shown that the fundamental electrochemical activity of the elemental sulfur was preserved in the produced materials. Testing of electrochemical
cells assembled with lithium in the anode and different sulfur based materials in the cathode, including the synthesized
RAFT networks, is also shown. The results here presented highlight the new opportunities introduced by reversible-deactivation radical
polymerization mechanisms on the control of the synthesis process and in the design of such advanced materials and show also
that many potential derivatizing possibilities can be achieved.
Descrição
Palavras-chave
Batteries Crosslinking Electrochemistry Fuel cells Inverse-vulcanization RAFT polymerization
Contexto Educativo
Citação
Almeida, Carlos; Costa, Hugo; Kadhirvel, Porkodi; Queiroz, A.M.; Dias, Rolando; Costa, Mário Rui (2016). Electrochemical activity of sulfur networks synthesized through RAFT polymerization. Journal of Applied Polymer Science. ISSN 0021-8995. 133:39
Editora
Wiley