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Preparation of conductive coatings. Solution modification and CVD furnished coatings.

Kalnins, Davis (2019) Preparation of conductive coatings. Solution modification and CVD furnished coatings. Master's Thesis / Essay, Chemical Engineering.

Davis - Master Thesis ''Preparation of conductive coatings''.pdf

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In this work, two distinct methods were applied to modify nanocellulose particles with a conductive polymer – polyaniline (PANI). The first technique was a solvent-based approach, via in situ polymerization, where these particles were dispersed in an aqueous medium using ultrasonication prior to the addition of the monomer aniline and then the drop-wise addition of the oxidant ammonium persulfate. The resulting composite materials had varying electrical conductivity values of 8.22 × 10-6 to 3.24 × 10-1 S/cm, dependent on the mass ratio between PANI and nanocellulose in the composite material. This material was successfully integrated in a polyurethane matrix, resulting in a conductive film exhibiting a conductivity of 2.14 × 10-4 S/cm. The second method used in this project was chemical vapor deposition (CVD), in which nanocellulose particles were placed in a chamber under vacuum and exposed to vapors of the same monomer and the oxidant antimony pentachloride, resulting in very thin layers of PANI directly on the surface of the particles without the need of using additional solvents. Unfortunately, this approach did not yield a product with high enough conductivity, and further research has to be done to improve this technique. Products obtained by both methods were analyzed using FTIR, TGA, XRD, CHNS elemental analysis and four-point probe conductivity measurement. Additionally, SEM and XPS was applied for the CVD furnished composites to prove the presence of any PANI content in the material.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor nameSupervisor E mail
Degree programme: Chemical Engineering
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 03 Sep 2019
Last Modified: 13 Sep 2019 08:52

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