ABSTRACT
The most sensitive method that provides information on the outermost surfaces of polymeric materials is the contact angle [1]. One can use this technique just to dif ferentiate a hydrophobic surface from a hydrophilic one, or a lipophobic from a lipophilic one, but appropriate measurements can also give information on the changes in the surface properties when the surface composition and/or the surface structure is modified [2, 3]. Even the aging of the polymeric surfaces can be fol lowed: a good example is the monitoring of the surface reorganisation (typically the reorientation of hydrophobic and hydrophilic groups) when the polymers are exposed to different environmental conditions [4-7].
