Key Laboratory for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing, People's Republic of China.
Nanotechnology. 2010 Mar 19;21(11):115601. doi: 10.1088/0957-4484/21/11/115601. Epub 2010 Feb 22.
A great variety of polymer/layered silicate (PLS) nanocomposites have been reported, however, there are few exfoliated PLS nanocomposites and their inorganic-organic interfaces are still a great problem, especially for the elastomers. In this research, a kind of exfoliated elastomer/silicate layer nanocompound was prepared and proved by XRD and TEM, in which 10 phr Na(+)-montmorillonite was dispersed in butadiene-styrene-vinyl pyridine rubber by latex compounding method with acidic flocculants. Moreover, a dynamic mechanical thermal analyzer (DMTA) suggested a strong interfacial interaction (interaction parameter B(H) = 4.91) between the silicate layers and macromolecules in addition to the weak inorganic-organic interfacial interaction, and solid state (15)N NMR indicated the formation of a strong ionic interface through the acidifying pyridine. Subsequently, a remarkable improvement of the dispersing morphology, mechanical performance and gas barrier property appeared, compared to that using calcium ion flocculants. This supports the formation of an exfoliated structure and an improved interfacial interaction.
已经报道了大量的聚合物/层状硅酸盐（PLS）纳米复合材料，然而，只有少数插层 PLS 纳米复合材料，并且它们的无机-有机界面仍然是一个大问题，特别是对于弹性体。在这项研究中，通过胶乳复合方法，使用酸性絮凝剂，将 10 phr 的 Na(+)-蒙脱石分散在丁二烯-苯乙烯-乙烯基吡啶橡胶中，制备并通过 XRD 和 TEM 证明了一种插层弹性体/硅酸盐层纳米复合物的存在。此外，动态力学热分析仪（DMTA）表明，在弱无机-有机界面相互作用之外，硅酸盐层和大分子之间存在强烈的界面相互作用（相互作用参数 B(H) = 4.91），固态（15）N NMR 表明通过酸化吡啶形成了强离子界面。随后，与使用钙离子絮凝剂相比，分散形态、力学性能和气体阻隔性能有了显著提高。这支持了剥离结构和改善的界面相互作用的形成。
