聚二炔/纳米氧化铜复合物可逆热致变色性能及应用

Reversible thermochromic property and application of PDA/CuO-NPS composite

在二炔单体自组装过程中掺杂纳米氧化铜粒子,经紫外光(λ=254nm)照射聚合得到蓝色聚二炔/纳米氧化铜(PDA/CuO-NPS)复合物。在未聚合分散液中加入一定浓度的聚乙烯醇(PVA)水溶液,制备均匀的热致变色PVA/PDA/CuO-NPS薄膜。结果表明,PDA/CuO-NPS复合物具有蓝色到紫色再到红色的颜色转变特性,随着光聚合时间增加,分子内应力增加,变色温度由60℃降低为50℃。降温后分散液颜色迅速恢复到紫色,618nm处的峰值显著提高。通过与聚乙烯醇的交联,得到的PVA/PDA/CuO-NPS薄膜两步变色温度分别升高到约50℃和约85℃,并在红色(30℃)和黄色(90℃)之间可逆转换,经过多次循环后仍具有良好的可逆热致变色性能。

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.