期刊
POLYMER CHEMISTRY
卷 2, 期 6, 页码 1300-1306出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1py00035g
关键词
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资金
- National 863 Project [2007AA03Z324]
- National 973 Project [2007CD936203]
- NSFC [20674027, 50873045]
A series of novel electroactive copolymers of poly(amic acid) (PAA) bearing pendant aniline tetramer groups were prepared via direct polycondensation from novel electroactive diamine (EDA), 4,4'-diaminodiphenyl ether (p-ODA) and 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA). The structures of the copolymers were confirmed by FT-IR and H-1 NMR measurements. Then the prepared PAA copolymers were heated at 300 degrees C to induce cyclization, and transformed into polyimide (PI) films. The obtained PI films exhibited excellent thermal stability and outstanding mechanical properties. The PAA copolymers films had reversible redox couples with good cycle stability. The stepwise oxidation of as-prepared PAA copolymers by ammonium persulfate is monitored by UV-vis spectroscopy. The absorption peak at 571 nm underwent a red shift when it transformed from emeraldine state to pernigraniline state. Moreover, the PAA copolymers films revealed electrochromic behaviors with a color change from yellowish at its neutral state, to green, and finally to dark blue. They also exhibited extremely high optical contrast (%Delta T) up to 63% at 700 nm, moderate coloration efficiency (CE approximate to 100 cm(2) C-1) and low switching times of 3.9 s at 0.8 V and 1.3 s for fast bleaching.
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