Heat conduction anisotropy of drawn high density polyethylene samples

In the paper the influence of the morphology of cold drawn samples on heat conduction anisotropy is discussed. It was shown that the important role is played by the existence of air gaps between fibrils of oriented polymer and the perpendicular microcracks appearing with the increase of the draw rate of the specimens.Rolled drawn samples have a significantly reduced air gap contents thus the heat conduction anisotropy measurements on these rolled samples provide real data on polymeric material properties.To Professor F. H. Müller on the occasion of his 75. birthday.