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通过机械变形制备的纠缠稳定纳米多孔聚合物薄膜。

Entanglement-Stabilized Nanoporous Polymer Films Made by Mechanical Deformation.

作者信息

Hsu Hsiao-Ping, Kremer Kurt

机构信息

Max-Planck-Institut für Polymerforschung, Ackermannweg 10, Mainz 55128, Germany.

出版信息

Macromolecules. 2024 Mar 14;57(6):2998-3012. doi: 10.1021/acs.macromol.4c00187. eCollection 2024 Mar 26.

DOI:10.1021/acs.macromol.4c00187
PMID:38560347
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10976899/
Abstract

We present a new simulation-guided process to create nanoporous materials, which does not require specific chemical treatment and solely relies on mechanical deformation of pure highly entangled homopolymer films. Starting from fully equilibrated freestanding thick polymer melt films, we apply a simple "biaxial expansion" deformation. Upon expansion holes form, which are prevented from growing and coalescing beyond a characteristic size due to the entanglement structure of the melt. We investigate the local morphology, the void formation upon expansion, and their stabilization. The dependence of the average void (pore) size and void fraction (porosity) on the total strain and subsequent relaxation is investigated. Furthermore, the stabilization of the porous structure of the thin expanded films through cooling below the glass transition temperature is discussed.

摘要

我们提出了一种新的模拟引导方法来制备纳米多孔材料，该方法不需要特定的化学处理，仅依赖于纯高度缠结均聚物薄膜的机械变形。从完全平衡的独立厚聚合物熔体薄膜开始，我们施加一种简单的“双轴膨胀”变形。膨胀时会形成孔洞，由于熔体的缠结结构，这些孔洞的生长和合并被限制在一个特征尺寸之外。我们研究了局部形态、膨胀时的空洞形成及其稳定性。研究了平均空洞（孔隙）尺寸和空洞分数（孔隙率）对总应变和随后松弛的依赖性。此外，还讨论了通过冷却至玻璃化转变温度以下来稳定薄膨胀薄膜的多孔结构。

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本文引用的文献

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Pore Engineering for High Performance Porous Materials.高性能多孔材料的孔工程
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Free Standing Dry and Stable Nanoporous Polymer Films Made through Mechanical Deformation.通过机械变形制备独立站立的干燥稳定纳米多孔聚合物薄膜。
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