Why does Silane Enhance the Protective Properties of Epoxy Films?
Why does Silane Enhance the Protective Properties of Epoxy Films?
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DOI：
10.1021/la8028066
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发表时间：
2008-12-02
期刊：
影响因子：
3.9
通讯作者：
Schaefer, Dale W.
中科院分区：
文献类型：
--
作者：
Wang, Peng;Schaefer, Dale W.
利用中子反射率，从涂层结构和水响应行为两方面研究了新型环氧硅烷一步法涂层体系的防护机理。通过比较纯环氧树脂和环氧-硅烷混合物在各种水性环境中，硅烷的加入的影响进行了测定。具体地，研究了具有六个烷氧基部分和多硫桥的桥连双硅烷偶联剂。硅烷增强保护的关键机制是（1）硅烷在基材-涂层界面富集，形成疏水致密界面层和对基材的良好粘附，以及（2）硅烷用作交联剂，导致与纯环氧树脂相比更致密且亲水性更低的本体膜。双硫硅烷的疏水性质也增加了混合膜的总体疏水性。
Using neutron reflectivity, the protection mechanisms of a novel one-step epoxy-silane coating system were investigated in terms of coating structure and water response behavior. By comparing pure epoxy and epoxy-silane mixtures in various aqueous environments, the effects of the addition of silane were determined. Specifically, a bridged bis-silane coupling agent with six alkoxy moieties and a polysulfur bridge was investigated. The key mechanisms of silane-enhanced protection are (1) the silane is enriched at the substrate-coating interface, forming a hydrophobic dense interfacial layer and good adhesion to the substrate, and (2) the silane serves as a cross-linker, resulting in a denser and less hydrophilic bulk film compared to the neat epoxy. The hydrophobic nature of bis-sulfur silane also increases the overall hydrophobicity of the mixed film.