Surface Modification of Kapton® Films
The zeta potential is a valuable parameter to follow polymer surface modifications and to tailor-make biocompatible devices for medical applications.
Kapton® is a member of aromatic poly(imides) sharing their excellent properties, especially their high mechanical and thermal stability. Kapton® is used in various fields of applications like in automotive, aerospace, and semiconductor industry, where reliable electrical and thermal insulation and mechanical flexibility are required.
Another possible application of Kapton® is in the field of biosensors for protein or DNA microarrays.
Like other polymers, poly(imides) are chemically inert and require specific surface treatment to en-hance the biocompatibility of their surfaces.
Grafting of carboxylic acid, –COOH, into the outermost polymer surface introduces functional groups for the immobilization of biologically active compounds. These groups change the wettability of the polymer and improve the adhesion of bio-organic molecules thereby maintaining the bulk polymer properties.
The zeta potential is very sensitive to monitor the introduction of carboxylate groups on the surface of Kapton® films.