Tandem metathesis depolymerization and cyclopolymerization toward flexible–rigid block copolymers with unique damping properties

Abstract

Metathesis depolymerization (MDP) of natural rubber (NR) was readily conducted to afford depolymerized NR (dNRx) bearing the living chain end, which can initiate metathesis cyclopolymerization (MCP) of 1,6-heptadiyne monomers to...

Functional polydiynes prepared by metathesis cyclopolymerization of 1,7-dihalogen-1,6-heptadiyne derivatives

“…The PAs derived from MCP method demonstrated interesting electrical, optical, and magnetic properties, allowing them to be promising materials for various high-tech applications. [20][21][22][23][24][25][26][27][28][29][30][31][32] For example, M. R. Xie and colleagues explored the intrinsic ionic conductivity and electric conductivity using ionic polyacetylenes as prototype PAs by modification polymer backbones with imidazolium, triazoledendronized or dendritic 1,2,3-triazolium-containing oligo (ethylene glycol) pendants. [20][21][22][23] More recently, they investigated the unique damping properties of block copolymers containing a poly(heptadiyne) and a rubbery segment.…”

“…The copolymers showed relaxation plateau in a broad temperature window. 24 In the same period, T. L. Choi et al focused on searching for narrow/low band gap conjugated PAs through MCP route. 25,26 By cyclopolymerization of rationally designed 1,5-hexadiyne derivatives, the derived PAs contain highly strained cyclobutenes in each repeat unit, and the polymers unexpectedly showed much narrower band gaps than conventional substituted PAs by over 0.2 eV.…”