Blends of poly(butadiene-co-acrylonitrile)-polyaniline dodecylbenzenesulfonate [NBR-PAni.DBSA] were successfully prepared using an internal mixer for the first time. Electrical conductivities of all the vulcanized blends (up to 10 À2 S/cm with a conductivity percolation threshold 6.0 wt %/5.4 vol % of PAni.DBSA) were not affected with the addition of dicumyl peroxide (DCP) as the vulcanizing agent. The FTIR spectra of vulcanized NBR-PAni.DBSA blends resembled a superposition of the spectra of the raw materials, but with some notable peak shifts because of the changing intermolecular interactions between the polymers. Blends with 30 wt % of PAni.DBSA showed the best compatibility, i.e., with greatest peak shifts for their FTIR spectra and largest temperature shifts for their DSC recorded thermal events. The morphological studies (of both optical and transmission electron micrographs) showed that the thermomechanical mixing method had reduced the amounts of phase separation in all these NBR-PAni.DBSA blends.
Colorable, sulfur-vulcanized epoxidized natural rubber-polyaniline dodecylbenzenesulfonate (ENR-PAni.DBSA) blends with good electrical conductivities (up to 10−1 S·cm−1) and good mechanical properties (including high damping) were successfully prepared. An effect of conductive filler particle's surface area and shape was studied for the vulcanized blends by testing them through 900 cycles of straining. The elongated shape of PAni.DBSA particles (as observed by using transmission electron microscope) did contribute to the very low percolation threshold for unstrained samples (about 3.0 wt. % of PAni.DBSA loading) and the reproducible electrical behavior (≥95% retention of original unstrained value) for samples under straining cycles. With the ideal mechanical properties and reproducible electrical behavior, these vulcanized blends do have good potential to be used as flexible smart materials that can correspond to the straining process.
Electrically conductive (up to 10−1 S cm−1) ENR-PAni.DBSA blends were produced, and their corrosion-inhibiting behaviors for carbon steel were successfully investigated. As observed from both total immersion and electrochemical corrosion tests, ENR-PAni.DBSA blends consisted of very low and very high PAni.DBSA contents (i.e., ≤5.0 wt% and ≥40.0 wt%) and showed poor corrosion-inhibiting behavior for carbon steel, either in acid or artificial brine environment. Meanwhile, blends with 10.0 to 30.0 wt% of PAni.DBSA content exhibited the best corrosion-inhibiting behavior for carbon steel.
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