Reduced de-doping and enhanced electrical conductivity of polyaniline filled phenol-divinylbenzene composite for potential lightning strike protection application

Kumar, Vipin; Zhou, Yu; Shambharkar, Gatha; Kunc, Vlastimil; Yokozeki, Tomohiro

doi:10.1016/j.synthmet.2019.02.003

Reduced de-doping and enhanced electrical conductivity of polyaniline filled phenol-divinylbenzene composite for potential lightning strike protection application

Journal Article · Fri Feb 15 23:00:00 EST 2019 · Synthetic Metals

DOI:https://doi.org/10.1016/j.synthmet.2019.02.003· OSTI ID:1495952

^[1]; Zhou, Yu ^[2]; ^[3]; ^[4]; Yokozeki, Tomohiro ^[2]

Univ. of Tokyo (Japan); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tokyo (Japan)
Metallurgical Engineering & Material Science, Indian Institute of Technology Bombay, Powai, Mumbai (India)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this study, phenolic resin was mixed with a cross-linking agent divinylbenzene (DVB) to prepare a polyaniline-based electrically-conductive thermosetting polymer composite. It has been shown that this Phenol-DVB mixture can undergo cationic polymerization in the presence of the dodecylbenzene sulfonic acid (DBSA)-doped polyaniline (PANI). Composites with different weight ratios of phenolic resin and DVB were mixed with a fixed weight of DBSA-PANI (i.e. 30 wt. %). Increasing the phenol content in the resin system was found to improve the electrical conductivity of the composite to almost 2700%. This improvement has been assigned to the reduced de-doping of polyaniline in phenol-DVB resin. Active sites of phenol effectively attached to the β carbon of DVB and reduced the proton subtracting species of DVB, leading to reduced de-doping of PANI. This behavior was studied through various characterization techniques including differential scanning calorimetry (DSC), FT-IR spectroscopy and Scanning Electron Microscopy (SEM). Electrical conductivity measurement, mechanical properties, and in-situ electrical conductivity measurements were performed to find the optimized properties of the composite. Optimized composites prepared with the composition of 30 wt. % DBSA-PANI and 70 wt. % of phenol-DVB (50 wt. % each), have shown electrical conductivity of 0.20 S/cm and a flexural modulus of 2.1 GPa, which is a significant improvement in the flexural properties of polymer based-thermosetting composites with similar electrical conductivity. Lastly, this material can be a potential candidate for the lightning strike protection of fiber reinforced plastics.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1495952

Journal Information:: Synthetic Metals, Journal Name: Synthetic Metals Journal Issue: C Vol. 249; ISSN 0379-6779

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Conductive composite
De-doping
Lightning strike protection
Phenol-DVB
Polyaniline

Reduced de-doping and enhanced electrical conductivity of polyaniline filled phenol-divinylbenzene composite for potential lightning strike protection application

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