超拉伸聚合物-锂藻土纳米复合水凝胶

Polymer-Laponite Nanocomposite Hydrogels with Super-Elongation

将锂藻土(Laponite)纳米粒子分散在水中,加入丙烯酰胺类单体和过氧化物引发剂,不添加化学交联剂,原位自由基聚合可得到聚合物-Laponite纳米复合水凝胶。其透明度高,可以拉伸至1 300%以上,具有优异的力学性能,成为当前智能材料研究的热点之一。本文综述了聚合物-Laponite纳米复合水凝胶所用锂藻土的结构、性质以及复合水凝胶的合成、结构及物理特性,并探讨这一领域可能的发展方向。

A novel nanocomposite hydrogel can be prepared by in-situ radical polymerization of acrylamide monomers in the suspension of Laponite clay without cross-linkers. Laponite particle is a lamellar disk with diameter of 25--30 nm and thickness of 1 nm, which is believed to take the role of cross-linker in the hydrogel. This kind of hydrogel becomes the focus of smart materials with high transparency and excellent mechanical properties, which can be elongated up to 1 300%. Up to now, only acrylamide derivatives can be used in this polymerization. In this paper, the recent progress on the monomer, Laponite used in the gel and synthesis, structure, physical properties of the nanocomposite hydrogels with the structure and properties of Laponite is reviewed. The possible development of this nanocomposite hydrogel in the near future is also discussed.