聚3-乙酰基吡咯的合成、表征及其三阶非线性光学效应研究

Synthesis,Characterization and Third-order Nonlinear Optical Property of Poly(3-acetylpyrrole)

以吡咯为原料,通过4步反应合成了一种大π共轭高分子———聚3 乙酰基吡咯(PAPY)。利用1HNMR、FTIR和UV-Vis-NIR对反应中间产物及聚合物PAPY进行了结构表征。热重分析表明PAPY可耐330℃的高温。通过碘掺杂和w(H2SO4)=98%的浓硫酸掺杂处理,PAPY的电导率提高了3个数量级,分别为0 86和0 28S/cm。用721型分光光度计对PAPY在可见光区的透过率进行了测量,计算结果表明,PAPY的光学禁带宽度Eg=1 435eV,属窄能隙聚合物。采用标准后向简并四波混频(DFWM)系统对PAPY的三阶非线性光学效应进行了测量。结果表明,在532nm处PAPY的三阶非线性极化率为8 6×10-10esu。

A novel π-conjugated polymer,poly(3-acetylpyrrole)(PAPY),is synthesized via four step reactions.The chemical structures of the intermediates and PAPY are characterized by^1HNMR,FTIR and UV-Vis-NIR spectroscopy.TGA indicates that PAPY decomposes at temperature of 330 ℃.The conductivities of PAPY doped with iodine and concentrated sulfuric acid 〔w(H_2SO_4)=98%〕 are 0.86 S/cm and 0.28 S/cm,respectively.Permeation ratio of PAPY in visible region is measured by spectrophotometer(type 721),and by calculation,the optical band gap of PAPY,1.435 eV,is obtained.The third-order nonlinear optical property of PAPY is studied by the backward degenerate four wave mixing (DFWM) and at 532 nm,the third-order nonlinear optical susceptibility of PAPY is about 8.6×10^(-10) esu.