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Preparation method of carbazole schiff base copolymer

A Schiff base and copolymer technology, applied in the field of polymer electroluminescent materials, can solve the problems of fluorescence quenching, luminous efficiency and brightness reduction, and achieve the effects of low generation temperature, no pollution to the environment, and low energy consumption

Inactive Publication Date: 2011-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because PVK is prone to fluorescence quenching, the efficiency and brightness of luminescence are reduced [Jin Hui, Hou Tingbing, Fan Zhongchao, Yi Lixin, Su Yanmei. Quenching of PVK photoluminescence under electric field [J]. Photoelectron Laser, 2001.9 (12 ):886-888]

Method used

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  • Preparation method of carbazole schiff base copolymer
  • Preparation method of carbazole schiff base copolymer
  • Preparation method of carbazole schiff base copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Weigh 5g carbazole and 15g KOH, dissolve carbazole in 100ml of N'N-dimethylformamide, add KOH, heat the system to 50°C under mechanical stirring, and use a constant pressure dropper Add 5.8 g of bromooctane, react at room temperature for 20 h, extract the resulting reaction solution with dichloromethane, wash the extract with distilled water until pH = 7, dry the resulting extract with anhydrous magnesium sulfate, then filter, and finally Remove the dichloromethane solvent by rotary evaporation to obtain orange-yellow N-n-octylcarbazole;

[0016] (2) Weigh 5.0g N-octylcarbazole, then dissolve it in 20ml redistilled N'N-dimethylformamide, stir and mix well, and slowly add 315ml dropwise with a constant pressure dropper under ice-water bath conditions After reacting for 1 hour, heat up to 100°C and stir for 3 hours. After the reaction solution is cooled, neutralize it with NaOH solution to pH = 7, then extract it with dichloromethane, wash it with water three times, a...

Embodiment 2

[0020] The operating method is the same as in Example 1, except that the third step reaction time is extended from 12 hours to 24 hours. The analysis results show that the number average molecular weight in the product is 7645, the weight average molecular weight is 9628, and the polydispersity is 1.25. Other properties, such as DSC and PL tests, were unchanged.

Embodiment 3

[0022] The operation method is the same as in Example 1, except that in the first step, the reaction temperature is increased from 50°C to 70°C, and the reaction time is extended from 12 hours to 24 hours during the third step, and the analysis results show that the number average molecular weight in the product is 8650 , the weight average molecular weight is 11071, and the polydispersity is 1.27. Other properties, such as DSC and PL tests, were unchanged. In the PL test, the maximum fluorescence peak is at 401nm. No change in DSC testing.

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Abstract

The invention belongs to the field of polymer electroluminescent materials, and in particular relates to a preparation method of a carbazole schiff base copolymer. According to the preparation method, condensation reaction is preformed on an aldehyde group and an amino group to synthesize a carbazole ring containing schiff base copolymer of a large molecular weight. The main chain of the preparedcopolymer contains a carbazole group and a schiff base group, wherein the glass transition temperature reaches 178 DEG C, the molecular weight reaches 2200 and the fluorescent maximum peak is 400nm. Shown by the data, the product has better heat resisting property and excellent hole transport capacity, and can excite blue light with higher luminance purity.

Description

technical field [0001] The invention belongs to the field of polymer electroluminescent materials, in particular to a preparation method of a carbazole Schiff base copolymer. Background technique [0002] Carbazole is an aromatic heterocyclic organic compound. It has a tricyclic structure, which is formed by two benzene rings connected together and a carbon nitrogen heterocycle formed by the N atoms inserted between the benzene rings [http: / / en.wikipedia.org / wiki / Carbazole]. This conjugated structure makes carbazole have good photochemical stability, good hole transport performance, absorption in the range of ultraviolet light, and a band gap of 3.20eV, which is a blue light material. And by modifying its 3, 6, and 9 C atoms, accessing other functional groups, new photoelectric materials with more properties can be obtained [Adhikari, R.M.; Shah, B.K.; C.J.Org.Chem.2007, 72, 4727 .]. [0003] Carbazole-based small molecule materials are expected to become new alternatives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/06C09K11/06
Inventor 李齐方王玺
Owner BEIJING UNIV OF CHEM TECH
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