Surface Segregation of a Star-Shaped Polyhedral Oligomeric Silsesquioxane in a Polymer Matrix.,Langmuir

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Surface Segregation of a Star-Shaped Polyhedral Oligomeric Silsesquioxane in a Polymer Matrix.
Langmuir ( IF 3.7 ) Pub Date : 2020-07-24 , DOI: 10.1021/acs.langmuir.0c01785
Kentaro Yamamoto ₁ , Daisuke Kawaguchi _{1,

2} , Tatsuki Abe ₁ , Takeshi Komino ₃ , Masashi Mamada _{1,

3} , Taizo Kabe ₄ , Chihaya Adachi _{1,

3} , Kensuke Naka _{5,

6} , Keiji Tanaka _{1,

2}

Affiliation

A simple way to control only the surface properties of polymer materials, without changing the bulk properties, has long been desired. The segregation behavior when a component with a tiny amount fed into the matrix is thermodynamically enriched at the surface is one of the candidate methods. This capability was examined herein by focusing on a star-shaped polyhedral oligomeric silsesquioxane (s-POSS), where the central POSS unit is tethered to eight isobutyl-substituted POSS cages as a surface modifier. X-ray photoelectron spectroscopy revealed that the surface of a film of poly(methyl methacrylate) (PMMA) was almost completely covered with POSS units by adding just 5 wt % s-POSS to it. The segregated POSS dramatically altered the physical properties such as molecular motion and the mechanical and dielectric responses at the surface of the PMMA film. These findings make it clear that s-POSS is an excellent surface modifier for glassy polymers.

中文翻译：

聚合物基质中星形多面体低聚倍半硅氧烷的表面偏析。

长期以来，一直希望有一种仅控制聚合物材料的表面性质而不改变体积性质的简单方法。当在表面热力学富集少量进料到基质中的组分时，偏析行为是候选方法之一。本文通过重点研究星形多面体低聚倍半硅氧烷（s-POSS）来检查此功能，其中中央POSS单元拴系到八个异丁基取代的POSS笼子上，作为表面改性剂。X射线光电子能谱显示，通过仅向其中添加5重量％的s-POSS，聚甲基丙烯酸甲酯（PMMA）膜的表面几乎完全被POSS单元覆盖。分离的POSS极大地改变了物理特性，例如分子运动以及PMMA膜表面的机械和介电响应。这些发现清楚地表明，s-POSS是玻璃态聚合物的优异表面改性剂。

更新日期：2020-08-25

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