4,4′-双(2-磺基苯乙烯基)联苯二酸掺杂聚苯胺的研究

Investigation of 4,4′-bis(2-[1-styryl]-1-benzenesulfonoic diacid doped polyaniline

采用4,4′ 双(2 磺基苯乙烯基)联苯二磺酸(BSBD)掺杂本征态的聚苯胺,得到BSBD掺杂的聚苯胺(PANI/BSBD),探讨了掺杂温度、掺杂酸用量对PANI/BSBD电导率和溶解性的影响。结果表明,提高掺杂温度有利于提高PANI的掺杂程度和电导率,但过高的温度会引起PANI/BSBD的部分脱掺杂,电导率下降。增加BSBD的用量也可提高PANI的掺杂程度,提高PANI/BSBD电导率;但过量的游离BSBD会以固体杂质形式析出,使PANI/BSBD电导率下降。在90℃下,PANI链中亚胺氮(-N=)原子与掺杂酸中H+之比为1时,电导率达到最大值1.0×10-2S/cm。紫外可见光光谱(UV Vis)分析表明,随BSBD用量的增大和掺杂温度的提高,表征醌式结构的吸收峰强度逐渐下降,同时有一定红移,表明PANI/BSBD掺杂率的升高。傅立叶变换红外光谱(FTIR)表明,随着BSBD用量的增加,掺杂态聚苯胺的特征峰位置向低频移动,掺杂主要发生在-N=原子上。

In this paper, 4,4′-bis(2-[1-styryl]-1-benzenesulfonoic diacid (BSBD) doped polyaniline (PANI/BSBD) were prepared. The effects of doping temperature and dosage of BSBD on the conductivity and solubility of PANI/BSBD were mainly investigated. It was indicated that the conductivity increased with the increasing doping temperature and the BSBD dosage that both enhanced the doping level. However, dedpoing of PANI/BSBD occurred at higher temperature, and caused a little decrease of the conductivity. The excessive BSBD appeared as an impurity to the final PANI/BSBD and decreased the conductivity. A favorable conductivity of 1.0×10^(-2)S/cm can be achieved with the equal molar ratio of -N= to H^+ under 90℃. UV-Vis spectra showed the absorption intensity at 630nm decreased and an Einstein shift was observed with the increase of doping temperature and the BSBD dosage, which indicates the enhancement of PANI/BSBD doping level. It was indicated in FTIR spectra that both 1590 cm^(-1) and 1499 cm^(-1), which arose from the quinoid and benzenoid structures respectively, bathochromic shifted with the increase of BSBD dosage.