Although the use of medical devices is widespread, there is an increasing demand for new biomaterials used as implants or for preparing bioartificial organs. Several surface modification techniques have been developed to improve wetting and adhesion of polymer surfaces by introducing a variety of polar groups, with little attention to functional group specificity. When surface modification was a precursor to attaching a bioactive compound, these techniques must be tailored to introduce a specific functional group. The ideal surface modification techniques are those that introduce as close to a monolayer as possible of a desired functional group without causing irregular etching or producing significant hazardous waste.

The aim of this work is to improve the superficial hydrophilic properties of poly(ethyleneterephthalate) (PET) films. To achieve this object, amide and amine groups were produced by chemical and plasma-precursor treatments with triethylenetetramine. In order to obtain information about the chemical and morphological modifications of polymers, modern and high performant techniques were used: FTIR- ATR, XRD, contact angle, AFM. Treatment time dependency of amine concentration is depicted; more amines were incorporated after exposure to a longer time at the same temperature. For surface activation, plasma-precursor treatment was more efficient than simple chemical treatment. For all the treatments surface modifications are at nanometer scale. Because of the high number of identical hillocks, a relatively homogeneous surface occurred at several treatment times.Optimal treatment parameters were found by fluorescence optical microscopy measurements after collagen deposition.

Nitrogen containing PET films can be considered as potential biomaterial substrates for the attachment of proteins and other biologically active molecules because they allow direct attachment of bioactive molecules.

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