Abstract
The coefficients of dry rest (μ0) and sliding (μs) friction on a polished disk made of quenched steel have been measured for various polymer matrices and fibers and for a composite unidirectionally reinforced with poly(amidobenzimidazole) (PABI) fibers. It is established that μ0 > μs for matrices and fibers with glass transition temperatures Tg below room temperature TR, otherwise μ0 ≈ μs. This effect is explained by a sharp growth in the plasticity of polymers at Tg, which leads to an increase in the polymer-steel contact area. For a composite with Tg > TR, the dry friction coefficients obey the relation μ0 ≈ μs≈ μe/C, where μe is the coefficients of sliding friction of PABI fibers and C is their concentration. For Tg < TR (plastic matrix), the friction coefficients of the composite and matrix are close because the latter cannot hold the fiber ends during friction. As a result, they are bent and aligned along the matrix surface or embedded in the surface layer.
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