掺杂有纳米铜微粒聚电解质多层膜的摩擦磨损行为研究

Investigation of Friction and Wear Behavior of Polyelectrolyte Multilayers Doped with Cu Nanoparticles

用快速高效的旋涂辅助分子沉积技术在旋转的基底上滴加相反电荷的聚二烯丙基二甲基氯化铵和聚对苯乙烯磺酸钠制备出初始聚电解质多层膜(PEMs),在PEMs上吸附Cu2+然后于硼氢化钠溶液中还原,通过9次吸附-还原循环,在PEMs内原位生成Cu纳米微粒,构成Cu纳米微粒掺杂的聚电解质多层膜。用UMT-2摩擦仪考察了薄膜的摩擦磨损行为,发现Cu纳米微粒能显著提高PEMs的耐磨寿命,这可归因于PEMs内Cu纳米微粒的承载能力和其微滚动效应。

Pristine polyelectrolyte multilayers（PEMs） was prepared by a time-and cost-efficient spin-assisted layer-by-layer（SA-LBL） technique which poly（diallyldimethylammonium chloride） and poly（sodium 4-styrenesulfonate） were sequential droped alternately onto a rotating substrate.Cu nanoparticles were achieved using 9 cyclical absorption-reducing processes in which copper ions were absorbed into the polymer matrix and then reduced in an NaBH4 solution,and the composite was denoted as PEMs doped with Cu nanoparticles.The friction and wear properties of PEMs were investigated on a UMT-2 multifunctional microtribometer.It is found that Cu-doped PEMs exhibit higher antiwear life than undoped ones.This should be attributed to the load-carrying capacity and the ＂rolling effect＂ of the Cu nanoparticles formed in the PEMs.