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In this report, we studied dielectric loss mechanisms in a 1–3 type of polymer nanocomposites, i.e., nanofibers or nanotubes in a polymer matrix. Sodium titanate nanotubes (TiNTs, 8–10 nm outer diameter and 300–500 nm long), which were synthesized by the hydrothermal method, were used as the fillers. The polymer matrix was a high permittivity relaxor ferroelectric polymer, poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)...
We report radical coupling copolymerization (RCCP) of various pairs of in-situ formed benzyl-type biradicals derived from dibromides in the presence of Cu/ligand. The monomer sequence distributions and compositions of copolymers were measured by 1H NMR. RCCP can be employed to synthesize some new kinds of polymers, such as polyether, polysulfone and poly(substituted arylene), under mild condition...
Periodic polymers with different repeating sequences, such as [AX], [AAX] and [ABAX], were synthesized by radical addition-coupling polymerization (RACP) of bifunctional monomers with benzyl bromide/α-methyl benzyl bromide groups and 2-methyl-2-nitrosopropane in the presence of Cu(0)/ligand. By selection of proper ligand and polymerization condition, the defects derived from self-coupling of benzyl-type...
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