Studies on Syntheses, Structure, and Properties of the Conjugated Conductive Polymer: Poly(acrylamide-aniline)

• Main Authors: Yung-Yu Fang, 方元昱
• Other Authors: Mu-Yi Hua
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/17865412834614532751

碩士 === 長庚大學 === 化學工程研究所 === 89 === Polyaniline (PAn) is currently considered to have high potentiality toward practical applications due to its cheap, good environmental stability and protonation with a protonic acid. However, it is very difficult to be dissolved in common organic solvents owing to its inherent rigid backbone. Thus, the aim of this research is to study the mechanism of PAn by react with 2,2¢-azobis-isobutyronitrile (AIBN) and acrylamide (AAm) in dimethylsulfide (DMSO) solution, and to investigate structure of the polymers. After the modification of PAn, water soluble occurs. The tools used for the studied are gel permeation chromatograph (GPC), nuclear magnetic resonance spectrometer (13C-NMR), ultraviolet-visible spectroscopy (UV-Vis), infrared spectroscopy (IR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC), dynamic mechanical analyzer (DMA), thermogravimetric analyzer (TGA), and conductivity measurements. In the true solution test, it was found that undoped and acid-doped PAn/AAm polymer could be dissolved in H2O. Results of GPC evidenced PAn/AAm polymers have two molecular weight distributions. One is caused by poly(acryl amide) (PAAm) and the other is due to the addition of AAm into PAn main chain, and their molecular weights are influenced by temperature and the amount of AIBN. 13C-NMR Results indicated that the AAm group is bonding with the nitrogen atom (N) of amine ring of PAn chain. For IR spectra, all the absorption bands at 1661 and 3185 cm-1 of C=O and N-H stretching vibration of PAAm, respectively, and at 3274 and 1306 cm-1 of N-H and Caromatic-N stretching vibration of PAn, respectively, shifted toward low frequency. These results indicate the presence of hydrogen-bond interactions of PAn added with AAm. For PAn/AAm DMSO solution, two absorption peaks exist at 355 nm (π-π* transition of the benzenoid ring) and 610 nm (excition absorption of the quinoid ring) but the decreasing of ratio of lmax,imine/lmax,amine. It is due to the thermal dissociation of DMSO into proton radical(H·), which will attack imine form of PAn to amine form, causing the decreasing of imine structure. XRD results indicate AAm group help PAn chain to form a more regular phase resulting in the formation of a new phase at 2q= ~10°. The co-existence of two-phase strongly supports those hydrogen-bond interactions between the two components. For conductivity measurement as measured using the four-probe method, the decreasing of conductivity of PAn with the increasing of AAm is due to the decreasing of imine in the reaction and the dropping of doping level.