中文摘要：

通过溶液缩聚法合成了一系列不同组分的无规共聚物——聚对苯撑苯并二噁唑-co-聚（9,9-二辛基芴苯并二噁唑）（PBO-co-PBOF）。利用X射线衍射、紫外-可见光吸收光谱、光致荧光光谱研究了不同组分和结构变化对聚合物形态和光物理性能的影响。结果表明：聚合物主链上辛基芴基团的引入使聚合物结构从晶态转变为非晶态。共聚物分子链上宽带隙PBO单元和窄带隙PBOF单元的能带没有完全杂化,在甲基磺酸（MSA）溶液中,当共聚物单分子链的发射在PBOF的摩尔分数χ≥50%时,由PBOF单元起发射主导作用;而薄膜的发射随着PBOF组分的增加而逐渐红移,薄膜中产生了有效的能量转移,但更易形成集聚体。此外,由于质子化作用的存在,相对于在N,N-二甲基乙酰胺（DMAc）溶液中,PBOF的MSA溶液的紫外吸收和荧光发射都发生了明显的红移。

英文摘要：

A series of random copolymers of poly（p-phenylenebenzobisoxazole）-copoly（9,9-dioctyl fluorenol benzobisoxazole）（PBO-co-PBOF） with different PBOF content were synthesized through condensation polymerization.X-ray diffraction,UV-Vis absorption and photoluminescence spectroscopy were used to study the effect of the structures on the modalities and optical properties of the copolymers.Compared with PBO,amorphous structures of the copolymers were observed with the existence of fluorene units in the main chains.The emission spectra in MSA solution were mainly dominated by PBOF with χ（PBOF）≥50%.Copolymers in films exhibited a general trend of red shift to the maximum emission with the increasing of PBOF content due to the interaction between efficient intraand/or inter-molecule energy transfer and easily formed aggregate.Furthermore,compared with the spectra in DMAc solution,the protonated PBOF in MSA solution showed significant red shift in both UV-Vis absorption spectra and fluorescence（emission） spectra.