Surface Composition Control via Chain End Segregation in Blend Films of Polystyrene and Poly(vinyl methyl ether)
Surface Composition Control via Chain End Segregation in Blend Films of Polystyrene and Poly(vinyl methyl ether)
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通过聚苯乙烯和聚（乙烯基甲基醚）共混膜中链端偏析控制表面组成
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发表时间：
2003
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通讯作者：
S. Tasaki
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作者：
D. Kawaguchi;Keiji Tanaka;T. Kajiyama;A. Takahara;S. Tasaki
用X射线光电子能谱（XPS）结合中子反射率（NR）研究了单分散聚苯乙烯（PS）/聚乙烯基甲基醚（PVME）共混体系的表面聚集态。在对称的共混物的情况下，在聚合度，N，PVME和PS优先隔离在膜表面和与硅晶片的界面，分别，以最大限度地减少系统的自由能。通过实验获得的表面附近的浓度分布是一致的平均场预测。此外，还研究了由两端含氟烷基的PS（α，ω-PS（Rf）2）和PVME组成的对称共混物的表面组成。在这种情况下，PVME的表面富集被氟烷基端基的表面局部化所抑制，并且组成强烈依赖于N。α，ω-PS（Rf）2/PVME共混物中，α，ω-PS（Rf）2的N远小于PVME的N，其表面大部分覆盖有纳米粒子。
Surface aggregation states in miscible blends of monodisperse polystyrene (PS) and poly(vinyl methyl ether) (PVME) were studied by X-ray photoelectron spectroscopy (XPS) in conjunction with neutron reflectivity (NR). In the case of symmetric blends in terms of degree of polymerization, N, PVME and PS were preferentially segregated at the film surface and the interface with a silicon wafer, respectively, to minimize free energy of the system. The concentration profile near the surface obtained by experiments was consistent with a mean-field prediction. Also, the surface composition in symmetric blends composed of PS terminated by fluoroalkyl groups at both ends (α,ω-PS(Rf)2) and PVME was examined. In this case, the surface enrichment of PVME was suppressed by virtue of the surface localization of fluoroalkyl end groups, and the composition was strongly dependent on N. The surface in asymmetric α,ω-PS(Rf)2/PVME blend, in which N of α,ω-PS(Rf)2 was much smaller than that of PVME, was mostly covered with the ...