Agricultural and Synthetic Polymers.. Biodegradability and by Glass J.E., Swift G.

By Glass J.E., Swift G.

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6b with increasing V s can be understood as follows. ~ 21 . 40 J1m/s o .................................................................................... o I 500 Time. t (5) 1000 4r----------------------------------------, (b) Z Eu. 11lml5 Time. t (5) 300 Fig. 6. The spring force F as a function of time t for (a) a hydrocarbon liquid (hexadecane) and (b) for mica surfaces coated with end-grafted chain molecules (DMPE). llffil/s in case (b). 3]. the interface during a stick time period. The minimum free energy configuration may involve some interdiffusion of the hydrocarbon chains from the two monolayer films, or some other molecular rearrangement process.

3,4], Fig. 6b shows the spring force for DMPE monolayers on mica. DMPE is a grafted chain molecule (as in Fig. 5) which forms a elose packed crystalline monostick-slip motion is observed while only layer on mica. lm/s in the present case. However, note that the amplitude of the stick-slip spikes decreases continuously as V s increases towards reflecting a qualitatively different type of sliding scenario than that of the hexadecane film in Fig. 6a. Although it is not elear from Fig. , V c < We now discuss these two elasses of sliding systems in more detail.

This definition of TJ takes into account the fact that the friction force is generated at the interface between the substrate and the adsorbate layer. If PI = NdN denotes the fraction of the adsorbates in the first layer, in direct contact with the substrate, then für coverages up to a monolayer PI = 1, and in this case the definition above is valid even when the adsorbate layer is in a 2D-fiuid state. It is also convenient to introduce the slip time T = I/PlTJ with the following physical meaning: Suppose the adsorbate layer is sliding with the steady-state velocity vo as the driving force Fis suddenly (at t = 0) set equal to zero.

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