Pendant dipodal silanes having a disilapropyl terminus
申请人:Gelest Technologies, Inc.
公开号:US08921579B2
公开(公告)日:2014-12-30
Pendant dipodal silanes having formula (I) and methods for their synthesis are provided. In formula (I), R is an organic radical other than methyl and X may be a halogen, an alkoxy group, an acetoxy group, or a dialkylamino group. Films, adhesives, and composites formed from the inventive dipodal silanes generally demonstrate significantly greater hydrolytic resistance and film-forming ability than conventional silanes.
RSiX2CH2SiX3 (I)
Enhanced Hydrolytic Stability of Siliceous Surfaces Modified with Pendant Dipodal Silanes
作者:Barry Arkles、Youlin Pan、Gerald L. Larson、Mani Singh
DOI:10.1002/chem.201402757
日期:2014.7.21
The stability of surfaces in aqueous environments prepared from dipodalsilanes with hydrophobic alkyl functionality is compared to the stability of similar surfaces prepared from the conventional silanes. In strongly acidic and brine environments, surfacesmodified with dipodalsilanes demonstrate markedly improved resistance to hydrolysis compared to surfaces prepared from conventional silanes. Pendant
双足硅烷具有两个可以共价键合到表面的硅原子。与通常用于表面改性的传统硅烷相比,它们在保持表面涂层、粘合剂底漆和复合材料在水性环境中的完整性方面具有明显的优势。引入了新的非功能性和功能性双足硅烷,其结构包含“侧链”而非“桥连”有机官能团。将由具有疏水性烷基官能团的双足硅烷制备的表面在水性环境中的稳定性与由常规硅烷制备的类似表面的稳定性进行比较。在强酸性和盐水环境中,与由传统硅烷制备的表面相比,用双足硅烷改性的表面显示出显着提高的耐水解性。悬垂双足硅烷比桥连双足硅烷表现出更高的稳定性。通过二硅氧烷键的水解形成硅烷醇物质的表观平衡常数被确定为K c =[SiOH] 2 /[Si-O-Si][H 2 O]=6±1×10 -5有助于理解双足硅烷改性表面的水解稳定性增强。