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Huo E.,Siclinon University | Huang Y.,Siclinon University | Lu Z.,Siclinon University | Jiaing Q.,Siclinon University
Acta Polymerica Sinica | Year: 2012

A novel Polymer PTST bearing substituted squaric acid units in the main chain is synthesized vio '1 amamoto coupling reaction in the presence of Ni (PPh3)2 Cl2 as catalyst, and the chemical structure of PTST is confirmed by 1H-NMR 13C-NMR and FTIR. The polymer PISI is readily soluble in common organic sob ents such as chloroform, tetrahy drofuran, methy lene dichloride, chlorobenzene and 1, 2-dichlorohenzene, thus uniform thin films can he prepared from these solutions. The result from IG. shois s that the poly mer has excellent thermostability. The UV - Vis absorption spectrum of the poly mer in tetrahy drofuran shois s broad and strong absorption bands in the range of 270 ∼ 700 nm and lois hand gap suggesting that the poiy mer has good (ox erage is ith the solar spectrum. Ihe result of cyclic oltammetry indicates that the lois est unoccupied molecular orbital (LUMO,- 3.77 eV) and band gap (Eg) of the polymer are decreased by incorporation of the 3-cyclobutene-1, 2-dione segment, implying that the poiy mer is nearly similar to that of pery lene dimide- based poiy mers (- 3.9eV), indicating that the poly mer PTST is a potential n-type wily mer material for fabrication of polymer solar cells. hen blend poly (3-hexylthiophene) (P3HT) with the polymer PTST, even under a low doping ratio of 20wt%, P3HT would lead to the PL quenching of P3HT obviously, while higher doping ratio of 1: 1 (W: W) ould lead to completely quenching of emission from P3HT, suggesting that there exists efficient photoinduced electron transfer from P3HT to the target macromolecule. All these photophy sical and electrochemical properties indicate that the objective copoly mer PTST is a potential poly mer acceptor material.

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