Analysis of Homopolymer Distribution in a Polymer Blend Thin Film by Anomalous Grazing Incidence Small-Angle X-ray Scattering at the Bromine K-Edge,Macromolecules

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Analysis of Homopolymer Distribution in a Polymer Blend Thin Film by Anomalous Grazing Incidence Small-Angle X-ray Scattering at the Bromine K-Edge
Macromolecules ( IF 5.1 ) Pub Date : 2020-11-30 , DOI: 10.1021/acs.macromol.0c02017
Hiroki Hamamoto ₁ , Hideaki Takagi ₂ , Isamu Akiba ₃ , Katsuhiro Yamamoto ₁

Affiliation

Polystyrene-block-poly(4-hydroxystyrene) (PS–PHS)/poly(4-hydroxystyrene) brominated (Br-PHS) blend thin films were analyzed using anomalous grazing incidence small-angle X-ray scattering (anomalous GISAXS or AGISAXS), which provides sensitive elemental analysis using the energy dependence of the atomic scattering factor near the absorption edge. In this study, AGISAXS measurements were performed using energies near the absorption edge of the bromine atom to elucidate the dispersion state of the brominated homopolymer in the blend thin film. The PS–PHS/Br-PHS blend thin film formed hexagonally packed cylinders perpendicular to the silicon substrate. The energy-dependent GISAXS profiles proved the formation of core–shell cylindrical structures. The fitting analysis of the in-plane GISAXS line profiles of the hexagonally packed cylindrical domains with paracrystalline distortion revealed that Br-PHS segregated to the PS–PHS interface to reduce the interfacial energy of the PS and PHS.

中文翻译：

通过溴K边缘的异常掠入射小角X射线散射分析聚合物共混薄膜中的均聚物

聚苯乙烯嵌段使用异常掠入射小角度X射线散射（异常GISAXS或AGISAXS）分析了聚（4-羟基苯乙烯）（PS-PHS）/聚（4-羟基苯乙烯）溴化（Br-PHS）混合薄膜使用吸收边缘附近原子散射因子的能量依赖性进行敏感元素分析。在这项研究中，使用溴原子吸收边缘附近的能量进行AGISAXS测量，以阐明溴化均聚物在共混薄膜中的分散状态。PS-PHS / Br-PHS混合薄膜形成垂直于硅基板的六边形圆柱体。能源依赖的GISAXS剖面图证明了核壳圆柱结构的形成。

更新日期：2021-01-12

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