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首页> 外文会议>Second International Symposium on Adhesive Joints: Formation, Characteristics and Testing Vol.2 May 22-24, 2000 Newark, New Jersey >A new class of adhesion promoters for addition curable silicone adhesives
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A new class of adhesion promoters for addition curable silicone adhesives

机译：用于加成固化有机硅粘合剂的新型粘合促进剂

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Silicones intrinsically have low surface free energy and therefore either primers or additives, which function as adhesion promoters, must be utilized in order for silicones to adhere to surfaces. Alkoxysilanes, which are typically added to promote adhesion in condensation curable silicones, function by chemically coupling the silicone network to the substrate providing a deformable interfacial layer. We have developed a new class of addition curable silicones that are self-priming. These bifunctional materials are only partly miscible in the silicone matrix and bloom to the surface upon curing. The interfacial layer is comprised of an entanglement of the condensed adhesion promoter and the silicone matrix. X-ray Photoelectron Spectroscopy confirmed that the adhesion promoter concentration was enhanced at the adherend interface after cure. Molecular simulations support the hypothesis that the adhesion promoter most likely bonds to a hydroxyl defect site on the metal. The effect of adhesion promoter incorporation upon the curing profile of the silicone has been determined using NMR Imaging.
机译：有机硅本质上具有低的表面自由能，因此必须使用起粘合促进剂作用的底漆或添加剂才能使有机硅粘附到表面上。通常被添加以促进在可缩合固化的硅氧烷中的粘附的烷氧基硅烷通过将硅氧烷网络化学偶联至提供可变形界面层的基材而起作用。我们开发了一种新型的可自吸的加成固化有机硅。这些双功能材料仅可部分混溶在硅酮基质中，固化后会起霜至表面。界面层由冷凝的粘合促进剂和有机硅基质的缠结组成。 X射线光电子能谱证实固化后粘合促进剂浓度在被粘物界面处增加。分子模拟支持以下假设，即粘合促进剂最有可能与金属上的羟基缺陷位点结合。已经使用NMR成像确定了粘合促进剂掺入对有机硅的固化轮廓的影响。

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