Mechanism of ultraviolet and electron bonding of perfluoropolyethers
Mechanism of ultraviolet and electron bonding of perfluoropolyethers
复制标题
全氟聚醚的紫外和电子键合机理
作者：
G. Vurens;C. Gudeman;L. J. Lin;J. Foster
最近有报道称，全氟聚醚 (PFPE) 薄膜可以在 185 nm 紫外 (UV) 光照射下粘合到各种基材上。在本文中，我们研究了低能电子和紫外光对全氟聚醚薄膜的粘合。结果表明，键合是通过全氟聚醚分子与紫外光子激发基材产生的低能光电子的相互作用而发生的。全氟聚醚分子随后经历解离电子附着，导致自由基和F~离子的形成。随后自由基传播和终止步骤可能会交联聚合物并将其附着到基材上。讨论了电子键合和紫外键合全氟聚醚薄膜之间的异同。
It has recently been reported thatthin films of perfluoropolyethers (PFPE’s) can be bonded to a variety of substrates under illumination of 185-nm ultraviolet (UV) light. In this paper we examine the bonding of thin perfluoropolyether films by low-energy electrons and UV light. It is shown that the bonding takes place through interaction of the perfluoropolyether molecule, with a low-energy photoelectron created by excitation of the substrate by the UV photons. The perfluoropolyethermolecule subsequently undergoes a dissociative electron attachment, resulting in the formation of a radical and a F~ ion. It is likely that radical propagation and termination steps then cross-link the polymer and attach it to the substrate. The similarities and differences between electron-bonded and U V-bonded perfluoropolyether films are discussed.