Machine element

摘要

Compounds of the formula I R<1>-A-(Z<1>A<1>)l-(Z<2>A<2>)m-(Z<3>A<3>)n-R <2 > in which R<1>, R<2>, A, A<1>, A<2>, A<3>, Z<1>, Z<2>, Z<3>, l, m and n have the given definitions, are suitable for the thermal control of the frictional force in machine elements.