Nanotribology of polymer blends

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Abstract
We investigated rheological and tribological properties of polystyrene (PS) and poly (vinyl methyl ether) blends by atomic force microscopy.Glass transitiontemperature measurements showed that the blends whose PS contents were 80% (PS80) and 60% (PS60) were in the glassy state and in the glass-rubber transition state at room temperature, respectively. The force-distance curves were consistent with these results. The dependence of the frictional force F f of mica on the load indicated that only adhesional component contributed to F f . In contrast, the viscoelastic deformation of the surface of the blends contributed to the additional component of F f . PS60, which was in the transition state, exhibited the largest value of F f because of the large deformation. The value of F f of PS60 had a hysteresis in the loading and unloading processes because the tip penetration depth was larger in the unloading process. The large penetration depth of PS60 in the negative load region in the unloading process is ascribed to the pull-off effect of the polymer chains.

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