Architecture Effects in Complex Spherical Assemblies of (AB)n-Type Block Copolymers,ACS Macro Letters

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Architecture Effects in Complex Spherical Assemblies of (AB)n-Type Block Copolymers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-11-17 , DOI: 10.1021/acsmacrolett.0c00704
Stephanie M. Barbon , Jung-Ah Song , Duyu Chen , Cheng Zhang ₁ , Joshua Lequieu , Kris T. Delaney , Athina Anastasaki , Manon Rolland , Glenn H. Fredrickson , Morgan W. Bates , Craig J. Hawker , Christopher M. Bates

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Molecular architecture plays a key role in the self-assembly of block copolymers, but few studies have systematically examined the influence of chain connectivity on tetrahedrally close-packed (TCP) sphere phases. Here, we report a versatile material platform comprising two blocks with substantial conformational asymmetry, A = poly(trifluoroethyl acrylate) and B = poly(dodecyl acrylate), and use it to compare the phase behavior of AB diblocks, ABA triblocks, and (AB)_n radial star copolymers with n = 3 or 4. Each architecture forms TCP sphere phases at minority A block compositions (f_A < 0.5), namely, σ and A15, but with differences in the location of order–order phase boundaries that are not anticipated by mean-field self-consistent field theory simulations. These results expand the palette of polymer architectures that readily self-assemble into complex TCP structures and suggest important design considerations when targeting specific phases of interest.

中文翻译：

（AB）_n型嵌段共聚物的复杂球形组装中的结构效应

分子结构在嵌段共聚物的自组装中起关键作用，但是很少有研究系统地检查链连接性对四面体密堆积（TCP）球体相的影响。在这里，我们报告了一个通用的材料平台，该平台包括两个具有基本构象不对称性的嵌段，A =聚（丙烯酸三氟乙基酯）和B =聚（丙烯酸十二烷基酯），并用它来比较AB二嵌段，ABA三嵌段和（AB）的相行为。）_n个n = 3或4的星形星形共聚物。每种结构在少数A嵌段组成下形成TCP球形相（f _A<0.5），即σ和A15，但是在阶数-阶数相界的位置上存在差异，这是均场自洽场理论模拟所无法预期的。这些结果扩展了易于自组装成复杂TCP结构的聚合物体系结构的调色板，并提出了针对特定目标阶段的重要设计注意事项。

更新日期：2020-12-15

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