Height Switching in Mixed Polymer Brushes with Polymers of Different Stiffnesses,Macromolecules

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Height Switching in Mixed Polymer Brushes with Polymers of Different Stiffnesses
Macromolecules ( IF 5.1 ) Pub Date : 2020-08-20 , DOI: 10.1021/acs.macromol.0c01150
Xiao Yang ₁ , Jian-Hua Huang ₂ , Ivan V. Mikhailov ₃ , Alexey A. Polotsky ₃ , Meng-Bo Luo ₁

Affiliation

The conformational properties of mixed polymer brushes made of polymers with different stiffnesses are studied by using Monte Carlo computer simulations and the Scheutjens–Fleer self-consistent field approach. We find a height-switching phenomenon for the mixed brushes consisting of flexible and semi-flexible polymers of the same chain length. The semi-flexible polymers are located above the flexible ones at weak surface attraction, whereas the flexible polymers are located above the semi-flexible ones at strong surface attraction due to the adsorption of the semi-flexible polymers. The height-switching transition point depends on the grafting density, the rigidity of the stiff polymer, and the polymer chain length. Our results indicate that it is possible to control the surface property by mixed polymer brushes.

中文翻译：

具有不同硬度的聚合物的混合聚合物刷子的高度转换

通过使用蒙特卡洛计算机模拟和Scheutjens-Fleer自洽场方法研究了由具有不同刚度的聚合物制成的混合聚合物刷的构象特性。对于由相同链长的柔性和半柔性聚合物组成的混合刷子，我们发现了一个高度转换现象。由于半柔性聚合物的吸附，半柔性聚合物以较弱的表面吸引力位于柔性聚合物的上方，而柔性聚合物则以较强的表面吸引位于半柔性聚合物的上方。高度转换的转变点取决于接枝密度，硬质聚合物的刚度和聚合物链长。我们的结果表明，可以通过混合聚合物刷来控制表面性能。

更新日期：2020-09-09

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