Journal
COLLOID AND POLYMER SCIENCE
Volume 287, Issue 11, Pages 1347-1354Publisher
SPRINGER
DOI: 10.1007/s00396-009-2101-5
Keywords
Polyaniline; Self-assembling; Morphology; Amphiphilic dopant; Surfactant; Rheological property; Emulsion polymerization
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Funding
- Indian Space Research Organization [GAP 109439]
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Electrically conducting polystyrene (PS)/polyaniline blends have been prepared through a one-step anilinium-surfactant template-assisted emulsion polymerization at room temperature. The self-assembled cylindrical An(+)PDPSA(-) micelle formed inside the PS matrix can act as a structure directing template cum dopant. Morphological observation under scanning electron microscopic studies revealed that during the progress of polymerization, the initially formed nanostructured conducting polyaniline was changed into cubic/hexagonal/lamellar particles and finally transformed into a percolated structure inside the PS matrix. Blend was further characterized by UV-Vis spectroscopy, FTIR spectroscopy, X-ray diffraction, electrical conductivity, thermal stability, dielectric property, rheological property, and electromagnetic shielding efficiency. The key finding of this work is that the conductive blend prepared through micelle-guided polymerization exhibited superior electrical conductivity (9.6 S/m) with low percolation threshold concentration (5 wt%), excellent thermal stability, electromagnetic interference (EMI) SE of 1-10 dB which makes it a promising candidate for EMI shielding and antistatic discharge matrix for the encapsulation of microelectronic devices.
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