Benetti Edmondo M, Divandari Mohammad, Ramakrishna Shivaprakash N, Morgese Giulia, Yan Wenqing, Trachsel Lucca
Laboratory for Surface Science and Technology, ETH Zürich, Rämistrasse 101, 8092, Zürich, Switzerland.
Department of Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
Chemistry. 2017 Sep 12;23(51):12433-12442. doi: 10.1002/chem.201701940. Epub 2017 Aug 1.
Grafting synthetic polymers to inorganic and organic surfaces to yield polymer "brushes" has represented a revolution in many fields of materials science. Polymer brushes provide colloidal stabilization to nanoparticles (NPs), prevent and/or regulate the adsorption of proteins on biomaterials, and significantly reduce friction when applied to two surfaces sheared against each other. Can the performance of polymer brushes as steric stabilizers and boundary lubricants be improved? The answer to this question encompasses the application of polymer grafts presenting different chain topologies, beyond linearity. In particular, grafted polymers forming loops and cycles at the surface have been recently demonstrated to enable the modulation of interfacial physicochemical properties, including nanomechanical and nanotribological, to an extent that is difficultly addressed by using their linear counterparts. Loop and cyclic polymer brushes provide enhanced steric stabilization to surfaces, increase their biopassivity and show superlubricious behavior. Their distinctive structure, the methods applied to fabricate them and their application in several technologically relevant fields of materials science are reviewed in this contribution.
将合成聚合物接枝到无机和有机表面以制备聚合物“刷”，这在材料科学的许多领域引发了一场革命。聚合物刷为纳米颗粒（NP）提供胶体稳定性，防止和/或调节蛋白质在生物材料上的吸附，并在应用于相互剪切的两个表面时显著降低摩擦。聚合物刷作为空间稳定剂和边界润滑剂的性能能否得到改善？这个问题的答案包括应用具有不同链拓扑结构的聚合物接枝物，而不仅仅是线性结构。特别是，最近已证明在表面形成环和循环的接枝聚合物能够调节界面物理化学性质，包括纳米力学和纳米摩擦学性质，这是使用其线性对应物难以实现的。环状和循环聚合物刷为表面提供了增强的空间稳定性，提高了它们的生物惰性，并表现出超润滑行为。本文综述了它们独特的结构、制备方法及其在材料科学几个技术相关领域的应用。
