Abstract
Hyperbranched polyethylenimine (PEI) is covalently grafted to the surface of polyethylene (PE) particles in an effort to promote the growth of conductive thin films deposited using layer-by-layer (LbL) assembly. Growth of the grafting process is monitored with infrared spectroscopy and titration. LbL films are then deposited using dilute aqueous mixtures containing carbon black stabilized with PEI or poly(acrylic acid). Deposition of carbon black-filled bilayers on PEI-grafted PE shows uniform surface coverage and strong bonding after just two bilayers, while neat PE shows patchy film growth and poor adhesion, requiring eight bilayers to achieve full surface coverage. Acid-oxidized PE shows intermediate behavior with regard to deposition but shows weak bonding like neat PE. LbL films are characterized using electron microscopy and thermogravimetric analysis, which show linear growth for PEI-grafted particles and nonlinear growth for neat and acid-oxidized particles. Following carbon black deposition, the ...
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