Synthesis And Conductivity Of Polyacetylene With Dendritic 1,2,3-triazolium Pendants

Polyelectrolytes have been extensively researched and applied in many fields,such as lithium-ion battery,solar-cells,fuel cells,and supercapacitors.In the thesis,the polyacetylene derivatives with 1,2,3-triazolium were designed and prepared,after chemical doping,the polyelectrolytes materials with high ionic and electronic dual conductivities were obtained.The main content was depicted as following:In Chapter 2 of this paper,the ionic polyacetylenes（i PAs）with dendritic1,2,3-triazolium-containing oligo（ethylene glycol）（OEG）pendants were prepared by metathesis cyclopolymerization（MCP）.The dendritic triazolium and flexible OEG pendants endow the i PAs with low glass transition temperature of-29.0 ^o C and enhanced intrinsic ionic conductivity（σ_i）of 5.0×10^-5 S·cm^-1 at 30 ^o C.After doping with bis（trifluoromethane）-sulfonimide lithium（Li TFSI）,theσ_i of iPAs reached up to5.2×10^-4 S·cm^-1.When doped with iodine（I2）,the i PAs exhibited high electronic conductivity（σ_e）of 1.3×10^-5 S·cm^-1.If doped with both Li TFSI and I₂,the i PAs demonstrated the bestσ_i andσ_e of 8.3×10^-4 and 1.2×10^-5 S·cm^-1,respectively.Therefore,this type of iPAs displayed an enhanced conductive performance compared with the corresponding i PAs bearing dendritic triazolium-alkyl pendants or branched triazolium-OEG pendants.In Chapter 3 of this paper,i PA with tetra-triazolium containing OEG pendants-block-poly（cyclooctatetraene）（P2n-b-PCOTm）was synthesized by a tandem MCP and ring-opening metathesis polymerization,which performed the spontaneous self-assembly during polymerization in THF.The glass transition temperature of copolymer was-23 ^o C.The size（125 nm in solution）and morphology（a spherical nano-structure with diameter of 100 nm）of the copolymer were characterized by TEM,DLS and AFM.The conductivities of P2n-b-PCOTm were studied by means of the ac impedance method.Theσ_i of copolymer reached up to 1.9×10^-5 S·cm^-1.When doped with I₂,the copolymer exhibited the bestσ_i andσ_e of 5.9×10^-5 S·cm^-1 and8.2×10^-6 S·cm^-1,respectively.