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通过溶液缩聚的方法合成了一种含烷基侧链聚芴基苯并二噁唑聚合物(PBOPFx),讨论了聚合物的光物理性能、热性能和溶解性能.结果表明,在甲基磺酸(MSA)溶液中,PBOPFx紫外吸收显示出最大吸收峰为466 nm左右的蓝光发射,与PBO相比,最大紫外吸收峰和最大荧光发射峰均发生了明显红移,这是由于芴单元的引入,提高了聚合物的共轭程度,加强了对电子的束缚能力.此外,比较了PBOPFx在320 nm处和430 nm处激发得到的荧光发射光谱,预测聚合物中存在两种共轭单元,通过测定氧化还原曲线以及讨论stokes位移,验证了这个假设,但是由于两种共轭单元并没有出现明显的分离现象,同时还伴有电子传输杂化,致使PBOPFx主要显示出共轭长度大的单元的吸收和发射.另外由于芴单元中烷基侧链的存在,聚合物(PBOPFx)的热稳定性远低于聚亚苯基苯并二噁唑聚合物(PBO),起始分解温度在350℃左右,溶解性方面,PBOPFx有了很大的改善,在大多数有机溶剂中能较好溶解.
A kind of poly (fluorenylidene) benzobisoxazole (PBOPFx) containing alkyl side chains was synthesized by solution polycondensation method, and the photophysical properties, thermal properties and solubility of the polymers were discussed. Acid (MSA) solution, PBOPFx showed a maximum absorption peak of about 466 nm. Compared with PBO, the maximum UV emission peak and the maximum fluorescence emission peak both showed a red shift significantly, In addition, we compared the fluorescence emission spectra of PBOPFx excited at 320 nm and 430 nm, and predicted that there are two kinds of conjugated units in the polymer, This hypothesis is verified by measuring the redox curves and discussing the stokes shift, but since there is no obvious separation between the two conjugated units and accompanied by electron-transport hybridization, PBOPFx mainly shows units of large conjugation length (PBOPFx) has much lower thermal stability than polyphenylene benzobisoxazole polymer (PBO) due to the presence of alkyl side chains in the fluorene units, with an initial decomposition temperature of 350 ℃ or so, dissolved Aspect, PBOPFx has been greatly improved, can better dissolve in most organic solvents.