稀土铕配合物液晶聚合物性能研究-中国材料进展

文章信息/Info

Author(s):: Yuehua Cong; Weimin Gu; Xiaozhi He; Baoyan Zhang; Northeastern University, Liaoning Shenyang 110819

摘要:: 本文介绍了一类含铕配合物的新型荧光液晶聚合物材料。通过把手性液晶单体M1（烯丙氧基苯甲酸胆甾醇酯,液晶区间达132.1℃）和具有荧光性能的金属稀土E3+配合物（C3）把接枝到含氢硅氧烷上，制备得到含有稀土三价铕配合物的侧链液晶聚合物。研究了铕配体的共轭作用与荧光性能的关系。在紫外光激发下，该聚合物在室温下就显示较强的荧光，主波长为617nm，铕含量在8%以下时，随铕含量增加，荧光强度增强，当达到10%时荧光性能降低。单体C3的荧光配合物的荧光强度仅为其荧光液晶聚合物在主波长荧光强度的30%，揭示了荧光液晶聚合物的优势。与原不含铕的聚合物相比，液晶织构类型不变，但熔点略有升高，而清亮点呈下降趋势。这类材料除具有配合物荧光性外，其液晶性的存在使加工性提高。该类新材料为理论研究，应用研究提供了技术基础，也将展示广阔应用前景。

Abstract:: In this paper, a new series of luminescence liquid crystalline polymers with rare earth Eu(Ⅲ) complexes were reported for the first time. Such complexes were prepared by grafting copolymerization of the chiral liquid crystalline monomer (M1), 4-allyloxylbenzoic acid cholesteryl and complexes (C3) of Eu(Ⅲ) onto hydrosiloxane. The relationship between the conjugation effect of Eu3+ and luminescence properties was investigated here. Under stimulation by UV light, high luminescence intensity of such complexes was observed at ambient temperature with λmax at 617nm. When the content of Eu(Ⅲ) is under 8%, luminescence intensity increases with the increasing of Eu(Ⅲ) content. Such trend reverses once the content is above 10%.Advantage of such complex was demonstrated by the difference of the luminescence intensity of the complex of polymer and the complex of polymermonomer C3, which is only 30% of the former. Compared with polymer without Eu(Ⅲ), the LC texture remained the same, with higher Tm and lower TC. Besides superior luminescence properties, such Eu(Ⅲ) complex also had excellent processibility due to innate liquid crystal nature. The theoretical study of Eu(Ⅲ) liquid crystal complex can provide foundations to potentially wide industrial application.