| dc.description |
Methods of measuring the adhesion of thin films to bulk substrates are critically reviewed, with particular emphasis on the value of scratch testing methods. Results obtained by this method for a range of metals and polymers show that in many cases there is a considerable electrostatic component of adhesion, which is both time and temperature dependent. An examination of electrical conduction in polyethylene shows space-charge-limited currents, due apparently to positive hole injection at the anode. It is suggested that a similar mechanisms is the cause of the adhesion results. |
