Affiliation:
1. School of Materials Science and Engineering South China University of Technology Guangzhou Guangdong 510640 China
2. State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou Guangdong 510640, Peoples R China
Abstract
AbstractA semi‐aromatic tetracarboxylic dianhydide, 1,2,3,4,5,6,7,8‐octahydroanthracene‐2,3,6,7‐tetracarboxylic dianhydride (OHADA), was successfully synthesized via a Diels Alder reaction. Two polyimides (OHADA‐TFDB and OHADA‐BAFL) were obtained via one‐step polycondensation of OHADA with 2,2′‐Bis(trifluoromethyl)benzidine (TFDB) and 9,9‐bis(4‐aminophenyl)fluorene (BAFL) in m‐cresol, respectively. OHADA‐TFDB has better solubility and processibilty than OHADA‐BAFL, but colorless OHADA‐BAFL exhibits higher thermal stability and lighter color. OHADA‐TFDB and OHADA‐BAFL display high glass transition temperatures (Tgs) of 339 °C/385 °C from DSC curves and 335 °C/395 °C from TMA trances, respectively. Their decomposition temperatures at 5 % weight loss (Td5) are above 537 °C/546 °C under nitrogen. These results are much better than those from wholly alicyclic tetracarboxylic dianhydride‐based polyimides (PIs), which can be attributed to the benzene moiety in OHADA. Furthermore, OHADA‐TFDB and OHADA‐BAFL exhibit good optical transparency with the cutoff wavelength of 315 nm/305 nm, light transmittance over 74 %/72 % at 400 nm and 84 %/80 % at 500 nm, which indicates it is an effectively way to suppress the formation of charge transfer complex (CTC) by introducing alicyclic moieties in OHADA. Their mechanical properties are also characterized in this study.
Funder
National Natural Science Foundation of China
Cited by
4 articles.
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