三阶非线性光学材料甲基噁二唑聚炔合成研究

Synthesis and the third-order nonlinear optical property of oxadiazole-containing polyacetylene with mehyl group

设计合成了一种含甲基噁二唑功能基的聚炔材料聚(2-对甲基苯基-5-对乙炔基苯基-1,3,4-噁二唑)。对制得的聚合物和单体进行FT-IR、^(1)H-NMR、紫外、荧光和热重(TGA)表征及Z扫描(Z-scan)技术评价,结果表明:聚(2-对甲基苯基-5-对乙炔基苯基-1,3,4-噁二唑)在失重5%时,热分解温度为389℃,较之单体(312℃)有较大提高,热性能较好;非线性吸收系数为-1.53×10^(-10)cm/W,非线性折射率为4×10^(-17)cm^2/W,三阶非线性极化率为3.00×10^(-11)esu,三阶非线性光学性能良好,与侧链烷氧基取代的噁二唑聚炔相比性能显著提高。

A novel oxadiaozle-containing polyacetylene with methyl group poly[2-（p-methylphenyl）-5-（p-ethynylphenyl）-1,3,4-oxadiazole]was synthesized.The structure and properties of monomer and polymer were characterized and evaluated with FT-IR,^（1）H-NMR,UV-Vis,PL,TGA and nonlinear optical analysis.The results indicated that poly[2-（pmethylphenyl）-5-（p-ethynylphenyl）-1,3,4-oxadiazole]possessed thermal stability.The decomposition temperature,defined as the temperature of 5% weight loss,of the polymer was 389℃,while that of the monomer was only 312℃.The third order nonlinear optical properities of polymer were measured by Z-scan technique,which showed the nonlinear absoption coefficient,the nonlinear optical refractive index and third order nonlinear optical susceptibility as-1.53×10^（-10）cm/W,4×10^（-17）cm^2/W and 3.00×10^（-11） esu,respectively.The results were one order of magnitude larger than polyacetylene with alkoxy group,indicating the good nonlinear optical properties of polymer.