Interface densification in a microphase-separated diblock copolymer resolved by small-angle X-ray scattering.

IF 2.8 3区 材料科学 Q1 Biochemistry, Genetics and Molecular Biology
Journal of Applied Crystallography Pub Date : 2025-05-12 eCollection Date: 2025-06-01 DOI:10.1107/S1600576725002638
Yu-Hsuan Lin, Yu-Chung Chen, Aditya Sahare, Yi-Cheng Lai, Chun-Jen Su, Jing-Cherng Tsai, Katsuhiro Yamamoto, Hsin-Lung Chen
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引用次数: 0

Abstract

In block copolymers exhibiting lower critical ordering transition behavior, the segregation strength increases with temperature due to the significantly different thermal expansivities of the constituent blocks. Using synchrotron small-angle X-ray scattering, we reveal a phenomenon of segmental densification at the microdomain interface in this type of system, where the local electron density in a specific region of the interface surpasses that of the denser domain. As a result, the interfacial electron density profile deviates significantly from the hyperbolic tangent function expected for an incompressible melt. This unique densification effect can be attributed to the negative volume of mixing at the interface between the dissimilar segments and emerges when the electron densities of the constituent blocks are similar.

微相分离二嵌段共聚物界面致密化的小角x射线散射。
在具有较低临界有序转变行为的嵌段共聚物中,由于组成嵌段的热膨胀率差异显著,其偏析强度随温度升高而增加。利用同步加速器小角度x射线散射,我们揭示了这类系统在微域界面处的段状致密化现象,即界面特定区域的局部电子密度超过了致密域的电子密度。结果,界面电子密度分布明显偏离不可压缩熔体的双曲正切函数。这种独特的致密效应可以归因于不同段之间界面处的负混合体积,并且当组成块的电子密度相似时出现。
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来源期刊
CiteScore
10.00
自引率
3.30%
发文量
178
审稿时长
4.7 months
期刊介绍: Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.
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