| 초록 |
A novel dianhydride monomer, 2-quaterthiophenepyromellitic dianhydride (4TPMDA), was prepared and utilized to prepare polyimides. First, 2-[2,2':5',2":5",2"']quaterthiophenyl-5-yl-4,4',5,5'-tetramethyl-1,3,2-dioxaborolane (B4T) was synthesized by Suzuki coupling reaction from 5,5'-dibromo-2,2'-bithiophene (2Br2T) and 2-[2,2']bithiophenyl-5-yl-4,4',5,5'-tetramethyl-1,3,2-dioxaborolane(B2T), followed by lithiation. Then, the B4T was reacted with 3-bromo-N,N’-diphenylpyromellitimide(BrPPMI), providing 2-quaterthiophene-N,N’-diphenylpyromellitimide 4TPPMI. Next, it was subjected to deprotection and then cyclodehydration, generating 4TPMDA. Finally, the 4TPMDA was utilized to prepare polyimides with diamine such as 2,2'-bis(trifluoromethyl)benzidine via a two-step process. The polyimides were characterized by NMR, FT-IR, TGA, DSC and GPC, and optoelectronic properties were evaluated by PL, UV-VIS and CV. |
