Thiophen alternate copolymer with main chain containing double bond and its preparation method

Abstract

The invention discloses a thiofuran alternative copolymer with a main chain containing double bonds, whose general formula is shown at right. In the formula, R is hexyl or octyl, R1 is 2, 5-diphenyl-1, 3, 4-oxadiazole or pyridine, and n is more than or equal to 20 and less than or equal to 50. A method for preparing the thiofuran alternative copolymer with the main chain containing the double bonds in a right claim 1 has the following preparation steps of: 1. the preparation of 2, 4-divinyl-3-alkylthiophene; and 2. Heck coupled reaction. A polymer synthesized by the method introduces two electron attracting units, 1, 3, 4-oxadiazole and the pyridine to a polythiophene main chain with hole transmission as the main property, can effectively improve the electron affinity and the electron injection ability of the polymer, improve the injection balance of charges, and finally realize the aim of improving the phtoelectric efficiency of electroluminescent devices.

Description

1. Technical field The invention belongs to the technical field of electroluminescence materials, and in particular relates to an alternating copolymerized conjugated polythiophene electroluminescence material with double bonds in the main chain and a preparation method thereof. 2. Background technology Prior Art: As a new type of conductive polymer material, polythiophene derivatives (PTs) have attracted more and more attention from researchers because of their excellent photoelectric performance and huge potential application value. Alkyl-substituted polythiophene has excellent solubility and chemical stability, and it is easy to adjust the band gap of polythiophene by changing the length and volume of the substituent. In 2003, Tong Laga of Dalian University of Technology synthesized a series of alkyl and alkoxy substituted polythiophenes, and carried out research on their photoelectric properties, and achieved good results. Li Yongfang and others disclosed a method for...

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Problems solved by technology

However, due to the small molecular weight of the oligomer, there is a certain gap between the film-forming and heat-resistant molecular materials, which is not conducive to the performance requirements of electroluminescent devices.

Monomer 2,5-bis(4-bromobenzene)-1,3,4-oxadiazole and 1,4-divinyl-2,5-di-n-butoxybenzene via Heck coupling under palladium catalysis It has been reported to obtain conjugated PPV polymer by reaction synthesis, but 2,4-divinyl-3-alkyl substituted thiophene, brominated oxadiazole and brominated pyridine were obtained by Heck coupling reaction to obtain 3-alkyl substituted thiophene- Ethylene-oxadiazole (pyridine) ternary alternating copolymers have not yet seen relevant patents and literature reports

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