Influence of anchor block size on the thickness of adsorbed block copolymer layers
Influence of anchor block size on the thickness of adsorbed block copolymer layers
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DOI：
10.1021/la960379w
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发表时间：
1997-07-23
期刊：
影响因子：
3.9
通讯作者：
Hadziioannou, G
中科院分区：
文献类型：
--
作者：
Belder, GF;tenBrinke, G;Hadziioannou, G
我们提出了三种不同的聚苯乙烯/聚（2-乙烯基吡啶）嵌段共聚物（PS/P2 VP）的表面力数据与固定大小的非吸附PS块，但吸附P2 VP块的大小变化很大。就两个嵌段的大小而言，它们的范围从中度到高度不对称。平衡力曲线几乎重叠，这意味着在锚块尺寸的大范围内，层厚度的变化非常小。这一发现与聚合物刷的简单缩放模型的预测不一致。然而，它同意从中子反射率数据上的一个可比系列的PS/P2 VP嵌段共聚物的调查结果。我们还发现协议与最近的中子反射率实验聚（二甲基硅氧烷）/聚苯乙烯和自洽场计算选择性吸附的嵌段共聚物。
We present surface force data on three different polystyrene/poly(2-vinylpyridine) block copolymers (PS/P2VP) with a fixed size of the nonadsorbing PS block but widely varying sizes of the adsorbing P2VP block. With respect to the sizes of the two blocks, they range from moderately to highly asymmetric. The equilibrium force profiles are almost overlapping, which means that the variation in layer thickness is very small over a large range of anchor block size. This finding is in disagreement with the predictions of simple scaling models for polymer brushes. However it agrees with findings from neutron reflectivity data on a comparable series of PS/P2VP block copolymers. We also find agreement with recent neutron reflectivity experiments on poly(dimethylsiloxane)/polystyrene and with self-consistent field calculations on selectively adsorbed block copolymers.