Nano-copper oxide particles were doped in the process of self-assembly of diacetylenic monomers,and the blue polydiacetylene/nano-copper oxide(PDA/CuO-NPS) composite was obtained by polymerized in ultraviolet light (λ=254nm).A certain concentration of polyvinyl alcohol aqueous solution was added to the unpolymerized dispersion to prepare uniform thermochromic polydiacetylene/nano-copper oxide film (PVA/PDA/CuO).The results showed that the PDA/CuO composite had the color transition characteristics from blue to purple to red.As the photopolymerization time increased,the intramolecular stress increased,and the discoloration temperature decreased from 60℃ to 50℃.After cooling,the color of the dispersion quickly returned to purple,and the peak at 618nm increased significantly.Through crosslinking with polyvinyl alcohol,the two-step discoloration temperature of the film was increased to ～50℃ and ～85℃ respectively,and undergone reversibly converted between red (30℃) and yellow (90℃).It had good reversible thermochromic properties.
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基金资助
国家自然科学基金(21975107);国家重点研发计划(2018YFC0810304)
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