可溶性聚噻吩甲烷的制备与光学性能

Preparation and Optical Properties of Soluble Poly( thiophene methane)

利用噻吩和对二甲氨基苯甲醛在酸性条件下共聚,制备了一种具有可溶性、分子链部分共轭的聚噻吩甲烷衍生物。采用傅里叶变换红外光谱、紫外-可见吸收光谱、荧光光谱、热重分析和X射线衍射谱对聚合物的分子结构、光学性能、热稳定性能及聚集态结构进行了表征和分析。由紫外-可见吸收光谱可得,该聚合物的光学禁带宽度为1.3 eV,属于窄带隙聚合物。荧光光谱显示,该聚合物溶液在480 nm可见光的激发下,出现约600 nm的发射光,说明该聚合物为橙黄色的荧光材料。X射线衍射谱中17.3°附近存在1个较为尖锐的衍射峰,表明该聚合物聚集态结构为部分结晶态。

A soluble and partly conjugated poly （thiophene methane） derivative was prepared by the copolymerization of thiophene and 4-dimethylaminobenzaldehyde under acid condition. The molecular structure, optical performance, aggregation structure and thermal stability of the resulting polymer were investigated via Fourier transform infrared spectroscopy （FT-IR）, UV-vis absorption spectra, fluorescence spectra, X-ray diffraction （XRD） and thermogravimetric analysis （TGA）. UV-vis absorption spectra show that the optical band gap of the polymer is 1.3 eV, which belongs to a low bandgap. Fluorescence spectra indicate that the wavelength of emitting light is about 600nm under excitation of 480 nm visible light, suggesting that the polymer is an orange-yellow fluorescent material. There is a relative sharp diffraction peak near 17.3° from the XRD pattern, indicating that the aggregation state of the polymer is partially crystalline.