Morphology Control of Conducting Polymers
Date Issued
2012
Date
2012
Author(s)
Chen, Chia-Fu
Abstract
Conducting polymer has attracted many scientists since Shirakawa et al. discovered that polyacetylene can reach very high electrical conductivities. In this study, we focused on polyaniline (PANI) and poly(3,4-ethylenedioxythiophehe) (PEDOT). It was mainly consisted of three parts:
1. Synthesis of SiO2/P(BA-MMA)/PANI core-shell latex particles.
2. Mixed surfactants induced morphology change of polyaniline
3. In-situ polymerization of PEDOT in water/methanol with different DBSA content.
In the first part, SiO2/P(BA-MMA)/PANI core-shell latex particles were synthesized. This part focused on synthesizing inorganic/organic core-shell polymers with high transparency and easy to form films. The synthesized particle was benefit by both inorganic and organic properties, and having conducting properties due to our core-shell morphology. The particle sizes of core-shell particles were investigated by dynamic light scattering and TEM. TGA and DSC analysis of core-shell particles were also performed. With different concentration of DBSA presented during polymerization, it was found that better conductive core-shell particles came from higher DBSA concentration.
In the second part, we focused on how morphology influences the conductivity of polyaniline. Polyaniline was synthesized in the presence of a mixture of surfactants of DBSA and SDS in aqueous system. The morphology change of polyaniline was discovered under TEM photographs. The FTIR and UV-Vis spectra were also investigated. It was noted that when the morphology of polyaniline changed from sphere to rod, the conductivity of polyaniline pellet increased significantly. Besides, similar result can be applied on core-shell particles with polyaniline as the shell. The resulting core-shell particles are easy to form films and with high transparency and conductivity.
In the third part, PEDOT was synthesized via a fast film-forming method in different water/methanol ratios and with different DBSA concentrations. Highly transparent and conducting films of PEDOT were obtained in this way. The morphologies of PEDOT films were observed using SEM. The UV-Vis spectra of films were also investigated. With the iecrease of methanol/water ratio, the conductivities of PEDOT films increased. Doping levels and conductivities of PEDOT films were affected by the concentration of DBSA as well.
Subjects
Conducting polymer
polyaniline
core-shell latex particles
Type
thesis
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