CAJ | 학술논문

聚苯胺具有独特的掺杂脱掺杂特性，能在特定的反应条件下合成出形貌较好的纳米纤维，使得通过脱掺杂和二次掺杂能制备出拥有特殊防腐官能团的新型纳米材料。将硫酸体系中合成的聚苯胺纳米纤维经氨水脱掺杂，再用磷酸、对甲苯磺酸和酒石酸等功能酸在脱掺杂态聚苯胺基础上制备出二次掺杂态聚苯胺，测试了聚苯胺/环氧树脂复合涂层的防腐蚀性能，并与功能酸一次掺杂态聚苯胺进行了对比。结果表明，功能酸掺杂的聚苯胺都有一定的防腐蚀效果；功能酸二次掺杂态聚苯胺比一次掺杂态聚苯胺有更好的防腐蚀性能，二次掺杂态聚苯胺涂层拥有更高的阻抗，其中酒石酸二次掺杂态聚苯胺涂层的阻抗最高，浸泡120 d后为3.48×107?·cm2，较其一次掺杂态聚苯胺涂层高出一个数量级。
취분알구유독특적참잡탈참잡특성，능재특정적반응조건하합성출형모교호적납미섬유，사득통과탈참잡화이차참잡능제비출옹유특수방부관능단적신형납미재료。장류산체계중합성적취분알납미섬유경안수탈참잡，재용린산、대갑분광산화주석산등공능산재탈참잡태취분알기출상제비출이차참잡태취분알，측시료취분알/배양수지복합도층적방부식성능，병여공능산일차참잡태취분알진행료대비。결과표명，공능산참잡적취분알도유일정적방부식효과；공능산이차참잡태취분알비일차참잡태취분알유경호적방부식성능，이차참잡태취분알도층옹유경고적조항，기중주석산이차참잡태취분알도층적조항최고，침포120 d후위3.48×107?·cm2，교기일차참잡태취분알도층고출일개수량급。
As polyaniline (PANI) has unique doping and dedoping characteristics, good morphology nanofibers can be synthesized under specific reaction conditions and new nanomaterials with special anticorrosion functional groups can be prepared via the dedoping and twice doping process. PANI nanofibers doped with sulfuric acid were dedoped by ammonia solution, and based on this dedoped PANI, twice doped PANI were prepared in phosphoric acid, p-toluene sulfonic acid and tartaric acid system respectively. The structure of doped and twice doped PANI was characterized by FT-IR spectrometer and UV-Vis absorption spectrometer. An electrochemical workstation was used to record the open circuit potential (OCP) and the electrochemical impedance spectroscopy (EIS) of polyaniline/epoxy composite coatings, and their anticorrosion mechanism were investigated theoretically. FT-IR spectra and UV-Vis spectra indicated that the state of PANI was doped PANI in its emeraldine salt form. The electrochemical testing results showed that every coating had certain anticorrosion performance and the impedance value suffered a significant decrease at the beginning of immersion because the coating was permeated by the corrosive medium. The impedance value of twice doped PANI and doped PANI tended to stabilize after immersion for 22 d and 60 d respectively, the protection effect could be explained by the assumption that metallic cations formed a passivating complex with the dopant anion released from PANI, which improved the barrier property of PANI coating and slowed down the further corrosion of the metal. PANI doped twice with functional acid had better anticorrosion performance than doped state and twice doped PANI had higher impedance. PANI doped twice with tartaric acid had the highest impedance, the impedance value was 3.48×107?·cm2 after immersion for 120 d, an order of magnitude higher than its doped state.