质子辐照聚苯胺的Raman与红外光谱研究

Raman and Infra-red Spectra of Proton-Irradiated Polyaniline

本文用Raman与红外光谱表征质子辐照聚苯胺的结构。聚苯胺的红外光谱的主要吸收峰经低能和高能质子辐照后分别向高频移动2—12cm^(-1)和5—26cm^(-1)。在1228,1344,1380和1444cm^(-1)处的Raman带在低能质子辐照后分别移到1236,1348,1392和1456cm^(-1),在804,1588和1620cm^(-1)处的Raman带,经高能质子辐照后分别移到808,1592和1624cm^(-1)。醌型结构的拉曼线1588cm^(-1)也上移4cm^(-1)。这些结果表明,质子辐照不同于质子酸的掺杂(质子化过程)而是引起聚苯胺中分子链的断裂。

The structure of proton-irradiated polyaniline (PAn) has been characterized by Raman and infra-red spectroscopy. Frequency upshift of the main absorption peaks in infra-red spectra are 2-12cm^(-1)in low energy pro- ton-irradiated PAn, and that of high energy proton-irradiated PAn are 5- 26cm^(-1),in comparison to the spectrum of unirradiated PAn. Raman bands of PAn located at 1228, 1344, 1380 and 1444cm^(-1)are upshifted to 1236, 1348, 1392 and 1456cm^(-1) respectively after low energy proton irradiation. While the Raman lines at 804 and 1624cm^(-1) upshifted to 808 and 1624cm^(-1) respectively after high energy proton irradiation, and the line attributed to quinoid struc- ture at 1588cm^(-1) also sustained an upshift of 4cm^(-1). These results indicate that proton irradiation resulted in chain-scission in PAn. Experimental re- sults evidenced that proton irradiation is essentially different from protonic acid doping (protonation process) in PAn.