Structure-Variant Exciton Transfer and Spatial Confinement in Statistical Copolymers and Blends Based on Polybenzazoles

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• 作者：Zitao Liu ; Shanfeng Wang ; Qixin Zhuang ; Xinxin Li ; Fuyou Li ; Pingping Wu ; Zhewen Han
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：March 6, 2007
• 年：2007
• 卷：19
• 期：5
• 页码：1164 - 1169
• 全文大小：135K
• 年卷期：v.19,no.5(March 6, 2007)
• ISSN：1520-5002

文摘

In an effort to explore the applications of polybenzazoles with extraordinary mechanical properties,thermal stability, and electron transport properties, a series of copolymers and blends consisting of ahigher band gap poly(2,5-benzoxazole) (ABPBO) and a lower band gap poly(2,5-thienyl benzobisthiazole)(PBZTT) with different PBZTT compositions were synthesized and characterized. Structure-variantmechanisms of both exciton transfer and spatial confinement were revealed in tuning emitting color andefficiency using these statistical copolymers and blends. The absorption and emission maxima could bewell modulated by the composition of PBZTT in both copolymers and blends; however, the compositiondependence of emission maxima was significantly different, and only copolymers showed enhancedquantum efficiencies as high as 14 times compared to PBZTT. This difference was interpreted using aschematic illustration of composition-dependent supramolecular structures in both copolymers and blends.