Aromatic Polyamide Brushes for High Young’s Modulus Surfaces by Surface-Initiated Chain-Growth Condensation Polymerization
Aromatic Polyamide Brushes for High Young’s Modulus Surfaces by Surface-Initiated Chain-Growth Condensation Polymerization
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DOI：
10.1021/acs.macromol.1c02088
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发表时间：
2022-03
期刊：
影响因子：
5.5
通讯作者：
Caleb J. Reese;Yarong Qi;Dustin T. Abele;Maximillian D. Shlafstein;Rhys J. Dickhudt;Xun Guan;M. Wagner;Xitong Liu;S. Boyes
中科院分区：
文献类型：
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作者：
Caleb J. Reese;Yarong Qi;Dustin T. Abele;Maximillian D. Shlafstein;Rhys J. Dickhudt;Xun Guan;M. Wagner;Xitong Liu;S. Boyes
自50多年前开发以来，由于其耐热性，化学稳定性和高强度，芳香族聚酰胺已在工业上用于许多高性能应用。尽管时间跨度很长，但由于大多数芳族聚酰胺不溶于有机溶剂及其极高的熔融温度，因此作为表面涂层的应用有限。然而，已经开发了新的聚合技术来克服这种不溶性，从而允许开发诸如反渗透膜和气体分离膜的应用。随着取代基效应链增长缩聚反应的发展，可控增长芳香族聚酰胺已被证明可以从平面和曲面上生长。在这项研究中，芳香族聚酰胺与保护侧链生长从平坦和弯曲的表面，以允许后聚合脱保护和引入氢键沿着的聚酰胺的主链。然后，使用透射电子显微镜和原子力显微镜，探索聚合物刷的重要物理性质，包括接枝密度和杨氏模量的特征在于形成的芳香族聚酰胺刷。氢键的引入使芳香族聚酰胺刷的杨氏模量从5 - 6 GPa显著增加到22 - 32 GPa。我们的研究结果证明了芳香族聚酰胺刷的可调性，以实现高机械强度，并为其在高性能涂料等领域的应用铺平了道路。
Since being developed over 50 years ago, aromatic polyamides have been used industrially for numerous high-performance applications due to their heat resistance, chemical stability, and high strength. Despite this extensive time span, limited applications as surface coatings have been explored due to most aromatic polyamides being insoluble in organic solvents and their extremely high melting temperatures. However, new polymerization techniques have been developed to overcome this insolubility, allowing applications such as reverse osmosis membranes and gas separation membranes to be developed. With the recent advancement of substituent effect chain-growth condensation polymerization, controlled growth aromatic polyamides have been shown to grow from flat and curved surfaces. In this study, aromatic polyamides with a protecting side chain were grown from flat and curved surfaces to allow for post polymerization deprotection and the introduction of hydrogen bonding along the backbone of the polyamide. The aromatic polyamide brushes formed were then characterized using transmission electron microscope and atomic force microscopy to explore important physical properties of the polymer brushes, including grafting density and Young’s modulus. The introduction of hydrogen bonding dramatically increased the Young’s modulus of the aromatic polyamide brushes from 5–6 to 22–32 GPa. Our results demonstrate the tunability of the aromatic polyamide brushes to achieve high mechanical strength and pave the way for their application in areas such as high-performance coatings.