EFFECTS OF SECONDARY SOLVENT IN HCL-DOPED POLYANILINE PREPARED WITH THE ICE-TEMPLATING METHOD

• Main Author: NUGRAHANI (NIM : 10508057); Pembimbing I : Dr. Veinardi Suendo; Pembimbing I : Dr. H. Achma, AFIFAH
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14687
• Institution: Institut Teknologi Bandung

Polyaniline (PANI) is a conducting polymer that its conductivity and morphology are highly affected by variation of the solvent, oxidant, monomer, temperature, type and concentration of dopant and synthesis method. Ice-templating is a unique synthetis method where the monomer solution are trapped in a layer of ice that formed in-situ when monomer solution placed in freezer. Here, the layer of ice acts as polymerization template which can be easily removed simply through melting and drying after polymerization process completed. Modification of this method was carried out by varying the temperature and introducing the secondary solvent. The conductivity of PANI synthesized by ice-templating method has the highest value for PANI synthesized in the presence of 5 mL ethanol, which is 5,60 x10-2 Scm-1 at -14o C and 13.30 x 10-2 Scm-1 at -30o C. This result indicates that there is an optimum conditions of secondary solvent concentration. Polymerization temperature also affects the conductivity of PANI, where the conductivity of PANI tends to be better at lower polymerization temperature. Raman spectra show a presence of narrow peak at Raman shift of 547 cm-1 in PANI synthesized by ice-templating method. This peak can not be found in the case of PANI synthesized by 48 hours strring at 0o C. XRD patterns show that PANI structure is semi-crystalline. There is a strong and narrow peak centered at 2&#952; = 6o. This peak is related to PANI orderness. This peak also can not be found in the case of PANI synthesized by 48 hours strring at 0o C. The crystal structure of synthesized PANI is close to the ES-I cell parameters in the space group P21 with a = 7,05± 1,65 A , b = 8,60 ± 0,12 A, c = 9,50 ± 0,307 A, Beta = 97,5 ± 2,07o. Polymerization temperature and presence of secondary solvent does affect d((110)) value. The SEM micrographs reveal that the HCl-doped PANI has a rod structure. FTIR results show that the molecular structure is identical to those of the emeraldine salt form PANI which is electrically conductive. <br />