Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1998-09-02
Europhys. Lett. v.45, p.638, 1999
Physics
Condensed Matter
Soft Condensed Matter
11 pages, 3 figures, uses poliface.sty, minor changes, to appear in Europhysics Letters
Scientific paper
10.1209/epl/i1999-00215-y
We study reactions between end-functionalized chains at a polymer-polymer interface. For small chemical reactivities (the typical case) the number of diblocks formed, $R_t$, obeys 2nd order chemically controlled kinetics, $R_t \sim t$, until interfacial saturation. For high reactivities (e.g. radicals) a transition occurs at short times to 2nd order diffusion-controlled kinetics, with $R_t \sim t/\ln t$ for unentangled chains while $t/\ln t$ and $t^{1/2}$ regimes occur for entangled chains. Long time kinetics are 1st order and controlled by diffusion of the more dilute species to the interface: $R_t \sim t^{1/4}$ for unentangled cases, while $R_t \sim t^{1/4}$ and $t^{1/8}$ regimes arise for entangled systems. The final 1st order regime is governed by center of gravity diffusion, $R_t \sim t^{1/2}$.
O'Shaughnessy Ben
Vavylonis Dimitrios
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