不同工艺对PANI/PAA复合薄膜的电致变色性能影响研究

采用直接聚合法与逐层镀膜法分别成功制备了聚苯胺(PANI)/聚丙烯酸(PAA)复合薄膜，通过扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)等方法考察了两种工艺制备的薄膜的形貌和微结构，并测定了两种复合薄膜的循环伏安性能(CV)、电流响应特性(CA)及电致变色性能。结果表明，SEM与FT-IR证实了两种方法制备的PANI/PAA复合薄膜仅在材料结构上有所不同；直接聚合法制备的PANI/PAA复合薄膜(PANI/PAA-DP)表面具有较大颗粒，2对明显的氧化还原峰，氧化态和还原态的响应时间分别为120ms和226ms，在600~700nm波长处的透过率调制幅度为10%；逐层镀膜法制备的PANI/PAA复合薄膜(PANI/PAA-LP)具有多孔的网络结构，3对氧化还原峰，氧化还原反应更明显，电致变色性能更优异，其氧化态和还原态的响应时间分别为45ms和67ms，在600~700nm波长处的透过率调制幅度可达40%。

Influence of Synthetic Method on the Electrochromic Properties of PANI/PAA Composite Films

The preparation of PANI/PAA composite films was carried out by the direct polymerization method and the layer by layer method. The surface structure and the composition of the composite films were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR); the cyclic voltammetry (CV), the current response characterization (CA) and the electrochromic characterization were also mensurated. It was found that SEM and FT-IR results showed that these were only one difference in the material structure of the PANI/PAA composite films synthesized by the two methods; the PANI/PAA composite film synthesized through the direct polymerization method (PANI/PAA-DP) had a larger particles size, two clear oxidation and reduction peaks, the response times for reduction and oxidation were 120 ms and 226 ms, the transmittance modulation of the PANI/PAA composite films reached 10% at 600 ~ 700 nm; the PANI/PAA composite film synthesized through the layer by layer method (PANI/PAA-LP) had a porous network structure, three clear oxidation and reduction peaks, stable electrochemical property, improved electrochromic performance, the response times for reduction and oxidation were 67 ms and 45 ms, the transmittance modulation of the PANI/PAA composite films reached 40% at 600 ~ 700 nm, respectively.