Four new star-shaped π-conjugated oligomers （TPA-CZ3, TPA-TPA3, TPA-PTZ3 and TPA-BT3） with triphenylamine as a core and different electron-donating ability groups, carbazole, triphenylamine, phenothiazine and bithi...Four new star-shaped π-conjugated oligomers （TPA-CZ3, TPA-TPA3, TPA-PTZ3 and TPA-BT3） with triphenylamine as a core and different electron-donating ability groups, carbazole, triphenylamine, phenothiazine and bithiophene, as peripheral units have been designed and synthesized via the Heck reaction. These oligomers show good solubility in common organic solvents. Their photophysical, electrochemical, electronic structure and charge transfer properties between these star-shaped n-conjugated oligomers and N,N＇-bis（1-ethylpropyl）-3,4：9,10- perylene bis（tetracarboxyl diimide） （EP-PDI） have been investigated by UV-vis absorption spectra, photolumines- cence （PL） spectra, cyclic voltammetry （CV） measurement, theoretical calculations and fluorescence quenching. The results show that the absorptions and fluorescences of TPA-CZ3, TPA-TPA3 and TPA-PTZ3 are red shifted with the electron-donating ability of the peripheral unit increasing from carbazole to triphenylamine and phenothi- azine. In addition, although the bithiophene group has a weaker electron-donating ability than carbazole, triphenylamine and phenothiazine, the absorption and fluorescence of TPA-BT3 have a red shift than those of TPA-CZ3, TPA-TPA3 and TPA-PTZ3 because TPA-BT3 has a longer conjugation length than TPA-CZ3, TPA-TPA3 and TPA-PTZ3. The triphenylamine core and the peripheral units can constitute a large conjugated structure. The fluorescence quenching properties indicate that efficient charge transfer can happen between the star-shaped oligomers and EP-PDI.展开更多
通过溶胶-凝胶技术,利用合成的硅氧烷封端星形有机低聚物对环氧树脂进行改性,并固化试样。研究了硅氧烷封端星形有机低聚物/环氧树脂复合材料的拉伸强度和耐热性能,并利用 SEM 分析了拉伸样断面的微观结构。结果表明:硅氧烷封端星形有...通过溶胶-凝胶技术,利用合成的硅氧烷封端星形有机低聚物对环氧树脂进行改性,并固化试样。研究了硅氧烷封端星形有机低聚物/环氧树脂复合材料的拉伸强度和耐热性能,并利用 SEM 分析了拉伸样断面的微观结构。结果表明:硅氧烷封端星形有机低聚物改性环氧树脂固化后,复合材料的拉伸强度、断裂伸长率明显提高。随着偶联剂(KBE-9103)的加入,试样的拉伸强度、断裂伸长率上升。复合材料中由于引入 Si—O—Si 网络结构,其热稳定性能也明显提高。展开更多
文摘Four new star-shaped π-conjugated oligomers （TPA-CZ3, TPA-TPA3, TPA-PTZ3 and TPA-BT3） with triphenylamine as a core and different electron-donating ability groups, carbazole, triphenylamine, phenothiazine and bithiophene, as peripheral units have been designed and synthesized via the Heck reaction. These oligomers show good solubility in common organic solvents. Their photophysical, electrochemical, electronic structure and charge transfer properties between these star-shaped n-conjugated oligomers and N,N＇-bis（1-ethylpropyl）-3,4：9,10- perylene bis（tetracarboxyl diimide） （EP-PDI） have been investigated by UV-vis absorption spectra, photolumines- cence （PL） spectra, cyclic voltammetry （CV） measurement, theoretical calculations and fluorescence quenching. The results show that the absorptions and fluorescences of TPA-CZ3, TPA-TPA3 and TPA-PTZ3 are red shifted with the electron-donating ability of the peripheral unit increasing from carbazole to triphenylamine and phenothi- azine. In addition, although the bithiophene group has a weaker electron-donating ability than carbazole, triphenylamine and phenothiazine, the absorption and fluorescence of TPA-BT3 have a red shift than those of TPA-CZ3, TPA-TPA3 and TPA-PTZ3 because TPA-BT3 has a longer conjugation length than TPA-CZ3, TPA-TPA3 and TPA-PTZ3. The triphenylamine core and the peripheral units can constitute a large conjugated structure. The fluorescence quenching properties indicate that efficient charge transfer can happen between the star-shaped oligomers and EP-PDI.
文摘通过溶胶-凝胶技术,利用合成的硅氧烷封端星形有机低聚物对环氧树脂进行改性,并固化试样。研究了硅氧烷封端星形有机低聚物/环氧树脂复合材料的拉伸强度和耐热性能,并利用 SEM 分析了拉伸样断面的微观结构。结果表明:硅氧烷封端星形有机低聚物改性环氧树脂固化后,复合材料的拉伸强度、断裂伸长率明显提高。随着偶联剂(KBE-9103)的加入,试样的拉伸强度、断裂伸长率上升。复合材料中由于引入 Si—O—Si 网络结构,其热稳定性能也明显提高。
