Segregation at the Interface between a Homopolymer and a Binary Polymer Blend
1995; American Physical Society; Volume: 74; Issue: 17 Linguagem: Inglês
10.1103/physrevlett.74.3388
ISSN1092-0145
AutoresAlessandro Faldi, Jan Genzer, Russell J. Composto, W. D. Dozier,
Tópico(s)Material Dynamics and Properties
ResumoLow-energy forward-recoil spectrometry studies show that the interface between polystyrene $(A)$ and a miscible blend of two poly(styrene-co-4-bromostyrene)s $(B:C)$ has an interfacial excess of $B$, ${z}_{B}^{*}$, where $B$ is the component with the lower bromostyrene level. At 170 \ifmmode^\circ\else\textdegree\fi{}C, ${z}_{B}^{*}$ increases with the bulk volume fraction of $B$, ${\ensuremath{\varphi}}_{B\ensuremath{\infty}}$, has a maximum near 0.25, and then decreases. These results are in qualitative agreement with self-consistent field (SCF) calculations. SCF calculations of the interfacial tension and interfacial width predict that $B$ has an optimum compatibilizing effect for ${\ensuremath{\varphi}}_{B\ensuremath{\infty}}\ensuremath{\sim}0.25$.
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