Vol.3 No.4 (July 2013)
Relationship between Thermal Properties and Their Chemical Structure in Phenanthroimidazole-Based Material
Phenanthroimidazole and its derivatives have attracted more and more attention in preparing bipolar and high-efficiency saturated blue emitters due to their excellent thermal properties. To discuss the effect on the glass transi- tion temperature and thermal decomposition temperature originating from the chemical structure change in phenan- throimidazole-based material, such as the linked position and different substituent groups, 1,2-diphenyl-phenan- thro[9,10-d]-imidazole is chosen as a model compound based on the current results. By tuning the substituent structure and linked mode in the imidazole ring 1,2-position, some regularities are revealed. The analysis results show that the Tg decreases with the increase of the molecular steric and rises with the increases of conjugated degree and planarity, simultaneously, 2-position of imidazole ring plays a more important role in all substituent positions. The Td is enhanced with the increase of molecular weight, conjugation and molecular planarity. All of these would provide some valuable suggestions for the design of phenanthroimidazole-based materials with excellent thermal properties.
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