Preferred domain orientation in block copolymer fibers after solvent annealing†,Molecular Systems Design & Engineering

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Preferred domain orientation in block copolymer fibers after solvent annealing†
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2017-12-19 00:00:00 , DOI: 10.1039/c7me00122c
Zhengping Zhou _{1,

2,

3,

4} , Ke Cao _{1,

2,

3,

4} , Xi Chen _{2,

3,

4,

5} , Mai Nguyen _{2,

3,

4,

5} , Samantha J. Talley _{2,

3,

4,

5} , Robert B. Moore _{1,

2,

3,

4} , Stephen Martin _{2,

3,

4,

6} , Guoliang Liu _{1,

2,

3,

4}

Affiliation

Block copolymer fibers represent an emerging class of nanomaterials with attractive properties and functionalities. Previous work has used coaxial electrospinning to prepare block copolymer fibers in thermally stable sheaths, which allow for thermal annealing of the block copolymers to form ordered nanostructures. However, the resulting nanostructures are mostly concentric due to isotropic boundary conditions at the sheaths. Herein, we describe a strategy of utilizing solvent annealing to achieve ordered block copolymer nanostructures in fibers. Cylinder- and lamella-forming poly(methyl methacrylate-block-styrene) (PMMA-b-PS) block copolymers are synthesized via reversible addition–fragmentation chain transfer polymerization and electrospun into fibers. After solvent annealing, the block copolymers can form long-range ordered nanostructures and exhibit a preferred domain orientation that is perpendicular to the fiber axis. Complementary to thermal annealing of coaxially electrospun block copolymer fibers, the method of solvent annealing provides an alternative approach for controlling the block copolymer domain orientation in fibers.

中文翻译：

溶剂退火后，嵌段共聚物纤维的优先域取向†

嵌段共聚物纤维代表了新兴的一类具有吸引人的特性和功能的纳米材料。先前的工作已使用同轴电纺丝在热稳定的护套中制备嵌段共聚物纤维，这允许嵌段共聚物进行热退火以形成有序的纳米结构。然而，由于鞘的各向同性边界条件，所得到的纳米结构大部分是同心的。在本文中，我们描述了一种利用溶剂退火以实现纤维中有序的嵌段共聚物纳米结构的策略。圆柱和薄片形成的聚（甲基丙烯酸甲酯-嵌段-苯乙烯）（PMMA- b- PS）嵌段共聚物是通过以下方法合成的可逆加成－断裂链转移聚合并电纺成纤维。在溶剂退火之后，该嵌段共聚物可以形成长程有序的纳米结构，并且表现出垂直于纤维轴的优选的域取向。作为同轴电纺嵌段共聚物纤维的热退火的补充，溶剂退火的方法提供了控制纤维中嵌段共聚物域取向的另一种方法。

更新日期：2017-12-19

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