Tunable helical structures formed by blending ABC triblock copolymers and C homopolymers in nanopores,Polymer International

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Tunable helical structures formed by blending ABC triblock copolymers and C homopolymers in nanopores
Polymer International ( IF 2.9 ) Pub Date : 2021-05-06 , DOI: 10.1002/pi.6253
Ka Chen ₁ , Feng Wang ₁ , Meijiao Liu _{1,

2} , Xinping Wang ₁

Affiliation

ABC triblock copolymers with frustrated interactions of χ_ACN ≪ χ_ABN ~ χ_BCN confined in nanopores with A-block-attracting surfaces can self-assemble into helical morphologies, where the B blocks form helical domains wrapping around C-core cylinders within the A shell. It has been suggested that the number of helical strands (m) increases as the volume fraction of C block (f_C) decreases, while the increasing m is restricted because C blocks forming domains cannot maintain a cylindrical shape as f_C gradually decreases, and the B block domains transform from helical structures to toroidal domains. To prevent the restriction of increasing m, in the current study we added C homopolymers into nanopores. For a given triblock copolymer with (χ_ABN, χ_BCN, χ_ACN) = (80, 80, 20) and (f_A, f_B, f_C) = (0.7, 0.1, 0.2), varying the concentration (ϕ_H) and the chain length (γ) of the C homopolymers, as well as the diameter (D) of the nanopores, we constructed different two-dimensional phase diagrams with respect to two of these control parameters using self-consistent field theory. A number of helical structures with strands ranging from 1 to 6 are predicted. Our calculations indicate that m increases with increasing γ and D and decreasing ϕ_H. The theoretical results demonstrate that blending of homopolymer with one given triblock terpolymer could provide an efficient route to fabricate different complex helical nanostructures. © 2021 Society of Industrial Chemistry.

中文翻译：

通过在纳米孔中混合 ABC 三嵌段共聚物和 C 均聚物形成的可调螺旋结构

ABC 三嵌段共聚物与 χ _ACN ≪ χ _ABN ~ χ _BCN受限于具有 A 嵌段吸引表面的纳米孔中的相互作用受阻，可以自组装成螺旋形态，其中 B 嵌段形成螺旋结构域，围绕内部的 C 芯圆柱体A壳。有人提出，螺旋链的数量 ( m ) 随着 C 嵌段 ( f _C ) 的体积分数的减小而增加，而增加的m受到限制，因为形成域的 C 嵌段不能像f _{C那样保持圆柱形状}逐渐减小，B 块域从螺旋结构转变为环形域。为了防止增加m的限制，在目前的研究中，我们将 C 均聚物添加到纳米孔中。对于具有 ( χ _ABN , χ _BCN , χ _ACN ) = (80, 80, 20) 和 ( f _A , f _B , f _C ) = (0.7, 0.1, 0.2) 的给定三嵌段共聚物，改变浓度( φ _H ) 和 C 均聚物的链长 ( γ ) 以及直径 ( D）的纳米孔，我们使用自洽场论构建了关于这些控制参数中的两个的不同二维相图。预测了许多具有从 1 到 6 的链的螺旋结构。我们的计算表明，m随着γ和D的增加以及φ _H的减小而增加。理论结果表明，将均聚物与一种给定的三嵌段三元共聚物共混可以提供一种制造不同复杂螺旋纳米结构的有效途径。© 2021 工业化学学会。

更新日期：2021-05-06

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