Flexible Nanoporous Materials by Matrix Removal from Cylinder-Forming Diblock Copolymers,Nano Letters

当前位置： X-MOL 学术 › Nano Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Flexible Nanoporous Materials by Matrix Removal from Cylinder-Forming Diblock Copolymers
Nano Letters ( IF 9.6 ) Pub Date : 2021-08-30 , DOI: 10.1021/acs.nanolett.1c02097
Hongyun Xu ₁ , Han Xiao ₁ , Christopher J Ellison ₁ , Mahesh K Mahanthappa ₁

Affiliation

We describe a straightforward self-assembly route to nanoporous materials derived from a hexagonally-packed cylinder (HEX) morphology of a polyisoprene-block-polylactide (PI-b-PLA) diblock copolymer, by thermal cross-linking of the minority PI domains followed by selective chemical etching of the PLA matrix. The resulting mechanically stable and porous samples defy the expectation that the remaining cylinders cannot yield a robust, integrated material upon matrix removal. Scanning electron microscopy imaging reveals that this unexpected structural integrity stems from the interconnected nanofibrils therein, reflecting topological defects at the grain boundaries of the parent polydomain HEX nanostructure. Hydrodynamic radius-dependent poly(ethylene oxide) (M_n = 0.4–35 kg/mol) permeation behavior through these monoliths directly demonstrated the continuity and size selectivity of the nanoporous material. The ready accessibility of block copolymer HEX morphologies of varied chemistries suggests that this matrix etching strategy will enable the future design of functional, size-selective nanofiltration membrane materials.

中文翻译：

通过从形成圆柱体的二嵌段共聚物中去除基质来制备柔性纳米多孔材料

我们描述了从聚异戊二烯-嵌段-聚丙交酯（PI- b- PLA）二嵌段共聚物的六边形堆积圆柱体（HEX）形态衍生的纳米多孔材料的直接自组装途径，通过少数PI域的热交联随后通过选择性化学蚀刻 PLA 基质。由此产生的机械稳定和多孔样品违背了预期，即剩余的圆柱体在去除基质后无法产生坚固的集成材料。扫描电子显微镜成像表明，这种意想不到的结构完整性源于其中相互连接的纳米原纤维，反映了母体多域 HEX 纳米结构晶界处的拓扑缺陷。流体动力学半径相关聚（环氧乙烷） ( M _n= 0.4–35 kg/mol) 通过这些整料的渗透行为直接证明了纳米多孔材料的连续性和尺寸选择性。各种化学物质的嵌段共聚物 HEX 形态的易于获取表明这种基质蚀刻策略将使未来功能性、尺寸选择性纳滤膜材料的设计成为可能。

更新日期：2021-09-22

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11