Influence of conformational asymmetry on the surface enrichment of polymer blends II
Influence of conformational asymmetry on the surface enrichment of polymer blends II
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构象不对称对聚合物共混物表面富集的影响II
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
G. Fredrickson
中科院分区：
文献类型：
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作者：
J. P. Donley;G. Fredrickson
在聚合物熔体平均场螺纹模型中，我们重新考察了统计链段长度不对称性对均聚物共混物表面偏析的影响。通过建立Edwards-Helfand方程的数值自洽场解，我们证明了参数β2=α2/(6υ)(α是统计线段长度，υ是线段体积)较小的分量在中性的不可穿透表面上是富集的。定性地说，这一发现与我们先前的分析工作和实验结果是一致的。然而，与我们以前的工作相反，我们发现分离的绝对大小是两个物种的链长和系统的可压缩性的敏感函数。©1995 John Wiley&Sons，Inc.
We reexamine the influence of statistical segment length asymmetry on the surface segregation of homopolymer blends in a mean field thread model of polymer melts. By developing numerical self-consistent field solutions of the Edwards-Helfand equations, we demonstrate that the component with the smaller value of the parameter β 2 = α 2 /(6υ) (α is the statistical segment length and υ is the segment volume) is enriched at a neutral, impenetrable surface. Qualitatively, this finding is in agreement with our earlier analytical work and with experiment. However, in contrast to our earlier work, we find that the absolute magnitude of the segregation is a sensitive function of the chain lengths of the two species and of the compressibility of the system. © 1995 John Wiley & Sons, Inc.