Bottlebrush Block Copolymer Assembly in Ultraconfined Films: Effect of Substrate Selectivity
Bottlebrush Block Copolymer Assembly in Ultraconfined Films: Effect of Substrate Selectivity
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DOI：
10.1021/acs.macromol.0c02057
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发表时间：
2021-02-18
期刊：
影响因子：
5.5
通讯作者：
Shenhar, Roy
中科院分区：
文献类型：
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作者：
Aviv, Yaron;Altay, Esra;Shenhar, Roy
超细嵌段共聚物薄膜呈现出对薄膜厚度高度敏感的非体结构，并且受到衬底润湿性能的强烈影响。在这里，我们描述了具有不同侧链长度的瓶刷嵌段共聚物在不同类型的衬底上的自组装。我们的研究结果表明，衬底的性质对自组装形态和在溶剂-蒸气退火过程中演变的表面图案有显著的影响。特别是，我们通过实验和模拟观察到在双对称（即主链和侧链）瓶刷嵌段共聚物薄膜中获得的瞬态，衬底驱动的圆柱形结构形态，尽管这些聚合物一般倾向于形成片层结构。从这项研究中获得的见解强调了利用衬底化学诱导瓶刷嵌段共聚物薄膜形成独特形态的能力。
Ultraconfined block copolymer films present non-bulk structures that are highly sensitive to film thickness and are strongly influenced by the wetting properties of the substrate. Here, we describe the self-assembly of bottlebrush block copolymers with varying side-chain lengths on different types of substrates. Our results show a pronounced influence of the nature of the substrate on the self-assembled morphology and the surface patterns that evolve during solvent-vapor annealing. In particular, we observe by experiments and simulations a transient, substrate-driven morphology of cylinder-like structures obtained in films of doubly symmetric (i.e., the backbone and side chains) bottlebrush block copolymers despite the general tendency of these polymers to form lamellar structures. The insights gained from this study highlight the ability to use the substrate chemistry for inducing the formation of unique morphologies in bottlebrush block copolymer films.