Multiple Cracking of Metallized Polyimide Kapton Films

S.L.Bazhenov1, I.N.Nasrullaev1, I.V.Razumovskaya1, S. K. Kudaikulova2, B. A. Zhubanov2 and Marc J.M. Abadie3

1Department of solid state physics, Moscow State Pedagogical University,

29 M. Pirogovskaya street, Moscow, Russia

2Institute of Chemical Sciences, 106 Walikhanov street, 480100 Almaty, Kazakhstan

3Universite Montpellier II, Sciences et Techniques du Languedoc, Place Bataillon 34095, Montpellier Cedex 05, France

Abstract

Mechanical behaviour of metallized polyimide Kapton films was studied. The adhesion of metallized films to Kapton films is approximately hundred-folds higher than that of coatings made by usual sputter deposition of a metal on a polymer substrate. Multiple cracking of a metallized film was observed. Cracks of two different scale levels are observed. The cracks of the first type (microcracks) are short with 1-2 mm length. The cracks of the second type are much longer and have length of several hundreds microns. The cracks of this type appear at higher strains as compared with the shorter ones. In thinner 7-mm-thick samples long cracks were not observed.