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Gao Y.-R.,Dalian Research and Design Institute of Chemical Industry | Chu L.-L.,Dalian University of Technology | Guo W.,Dalian University of Technology | Ma T.-L.,Dalian University of Technology
Chinese Chemical Letters | Year: 2013

A novel benzodithiophene-containing organic dye BDT was synthesized and characterized as a sensitizer for a nanocrystalline TiO2-based dye-sensitized solar cell. The BDT dye shows two major electronic absorptions. The absorption of the BDT dye covers a broad visible range from 300 nm to 550 nm. The benzodithiophene unit was used as a π bridge with several advantages: (1) It facilitates the electron transfer from the donor to the acceptor; (2) A facile structural modification on the 4,8-positions in the benzodithiophene unit can be achieved; (3) Fusing benzene with two flanking thiophene units improves the thermal stability. Under simulated AM1.5G solar light (100 mW/cm 2) illumination, the DSC based on BDT gives a power conversion efficiency of 1.78%. © 2013 Ting-Li Ma.

Liu E.,Dalian Research and Design Institute of Chemical Industry | Liu E.,Dalian University of Technology | Shao Y.,Dalian Research and Design Institute of Chemical Industry | Zhang S.,Dalian University of Technology | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2011

Three new s-triazine UV absorbents 2, 4-bis(2-hydroxyl-4-alkoxyl)phenyl-6-(4-biphenyl)-1, 3, 5-triazine containing different alkoxyls were synthesized from cyanuric chloride by Grignard reaction, Friedel-Craft reaction and etherification reaction. The target compounds were characterized by means of FTIR, 1H NMR and MS. Ultraviolet absorption performances, light stabilities and thermal stabilities of the target compounds were tested. The results showed that ultraviolet absorption performances of the target compounds in the range of 280-380 nm were stronger than that of the commercialized product 2-(2-hydroxyl-4-heoxyl)phenyl-4, 6-diphenyl-1, 3, 5-triazine(Dssorb UV-1577). The maximum molar absorption coefficients of the three target compounds are 50502.05 and 52363.88 L/(mol·cm), 45123.59 and 49892.84 L/(mol·cm), and 52282.02 and 53291.56 L/(mol·cm), respectively. The target compounds have the similar light stability to Dssorb UV-1577 and their thermal stabilities are higher than that of Dssorb UV-1577.

Zhang Y.,Dalian University of Technology | Zhang Y.,Dalian Research and Design Institute of Chemical Industry | Shao Y.,Dalian Research and Design Institute of Chemical Industry | Liu W.,Dalian Research and Design Institute of Chemical Industry | Lu L.,Dalian University of Technology
Shiyou Huagong/Petrochemical Technology | Year: 2011

Four light stabilizers (1B, 2B, 3B and 4B) containing 2-[2-hydroxy-4-(piperidyl formare-1-yl)methoxyphenyl]-4, 6-diaryl-1, 3, 5-triazine structure were synthesized by transesterification of 2-[2-hydroxy-4-ethoxycarbonyl-methoxyphenyl]-4, 6-diaryl-1, 3, 5-triazine(1A and 2A) with 2, 2, 6, 6-tetramethylpiperidin-4-ol and 1, 2, 2, 6, 6-pentamethyl -piperidin-4-ol respectively. The yields were 72%, 68%, 74% and 66% respectively. Their ultraviolet absorptions, thermal stabilities and light stabilities were investigated. The results indicated that the ultraviolet absorption wavelength and molar absorption coefficient did not change significantly, the thermal stability decreased slightly and the light stability was enhanced after the hindered amine groups were introduced. Decomposition rates of compounds 1B and 2B declined 3-4 percentage points relative to raw material 1A(both substituents R 1 and R 2 were H) after photoaging 20, 30 and 40 h. Decomposition rates of compounds 3B and 4B declined 4.88 and 3.06 percentage points respectively, relative to raw material 2A(R 1 was H and R 2 was CH 3) after photoaging 40 h. The light stability was obviously improved after the hindered amine groups were introduced.

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