苯并唑类共聚物与共混物的能量转移与激子空间限制研究

通过3-氨基-4-羟基苯甲酸盐酸盐(AHBAH),2,5-二氨基-1,4-苯硫醇盐酸盐(DABDT)和2,5-噻吩二羧酸(TDA)在多聚磷酸中缩聚,合成了一系列不同组成的高、低带隙无规共聚物聚(2,5-苯并噁唑)-co-聚(2,5-噻吩基苯并二噻唑)(ABPBO-co-PBZTT),并制备了一系列由ABPBO和PBZTT组成的共混物.通过紫外-可见吸收光谱、光致荧光光谱研究了聚合物不同组成和结构变化对光物理性能的影响.随着共聚物中PBZTT含量的增加,共聚物的发射波长红移,并发生了明显的ABPBO结构吸收能量向PBZTT转移的现象,共聚物膜的量子效率比纯PBZTT膜的量子效率有明显提高.共混物虽然也发生了能量转移现象,但其更易于形成集聚体,量子效率与纯的PBZTT聚合物相比,并没有明显提高.

ENERGY TRANSFER AND EXCITON SPATIAL CONFINEMENT IN COPOLYMERS AND BLENDS BASED ON POLYBENZAZOLES

A series of blends of poly(2,5-benzoxazole)(PABPBO) with poly(2,5-thienylbenzobisthiazole)(PPBZTT) and their random copolymers P(ABPBO-co-PBZTT) with different PBZTT content were prepared.The effect of structure variation on optical properties of copolymers and blends were investigated in detail using UV absorption and emission spectroscopy.Copolymers both in dilute solution and in film exhibited efficient intra-and/or inter-molecule energy transfer,and the quantum efficiencies of copolymers were enhanced obviously compared to pure PPBZTT polymer.Maximum emission wavelength of copolymers red shift with increasing PBZTT content was also observed.Though energy transfer was also found in blends,the quantum efficiencies of blends were similar to that of pure PPBZTT polymer because aggregates were easily formed in blends.