摘要
通过3 丁酰基吡咯单体与4 醛基4’ 二甲氨基偶氮苯的缩聚反应合成了一种侧链含偶氮基团的新型聚吡咯甲烯衍生物———聚[(3 丁酰基吡咯 2,5 二)对二甲氨基偶氮苯甲烯](PBPDMAABE).与无取代基的聚[(吡咯 2,5 二)对二甲氨基偶氮苯甲烯]相比,该聚合物的溶解及成膜性能得到了很大的改善.PBPD MAABE的分子结构通过氢核磁共振谱和红外光谱得到了确认.由聚合物紫外 可见吸收光谱测得其光学禁带宽度为1 82 eV.采用后向简并四波混频(DFWM)技术测试了聚合物溶液与薄膜的三阶非线性光学性能,其浓度为3 65×10-5 mol/L的氯仿溶液和薄膜的三阶非线性极化率分别为 2 12×10-8 esu和 3 91×10-8esu.通过理论计算可得 PBPDMAABE 的二阶超分子极化率和非线性折射率分别为 2 68×10-25 esu 和5 47×10-7 esu.实验结果表明,PBPDMAABE具有优良的非线性光学性能.
A novel poly(pyrrole methine), poly[(3-butyrylpyrrole-2,5-diyl)p-(N,N-dimethylamino)azobenzylidene] (PBPDMAABE) was synthesized firstly by condensation reaction of 3-butyrylpyrrole with 4-aldehyde-4'-dimethylaminoazobenzene (ADMAA). The polymer can be easily dissolved in many kinds of organic solvent. The solubility and film-forming performance of the polymer are better than that of poly [(pyrrole-2,5-diyl)p-(N,N-dimethylamino)azobenzylidene]. The chemical structure of PBPDMAABE is proved by infrared spectrum, proton magnetic resonance spectrum and ultraviolet-visible absorption spectrum. The optical forbidden band gap (Eg) of PBPDMAABE is about 1.82 eV. The third-order nonlinear optical properties of the polymer are studied using degenerate four-wave mixing (DFWM) at 532 nm. The measured third-order nonlinear susceptibilities of PBPDMAABE chloroform solution and film are as large as 2.12×10-8 esu and 3.91×10-8 esu, respectively. The second hyperpolarisability value of PBPDMAABE is 2.68×10-25 esu and its nonlinear refractive index is 5.47×10-7 esu. The results indicate that the novel polymer is a promising nonlinear optical material.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2005年第2期174-177,217,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(60277002).
