Composites having ionomer bonds with silanes at the interface
Composites having ionomer bonds with silanes at the interface
复制标题
在界面处具有与硅烷离聚物键合的复合材料
DOI：
--
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
E. Plueddemann
中科院分区：
文献类型：
--
作者：
E. Plueddemann
- 硅烷偶联剂已被开发用于将几乎所有热固性和热塑性聚合物粘合到玻璃和金属表面。与聚合物的键合通常是通过低聚硅氧烷在界面处的相互扩散，在界面区域中可能与互穿聚合物网络交联。这种结构为在低剪切下制备的复合材料提供了非常稳定的、跨越界面的防水结合。在高剪切下，例如在注塑成型中，最初形成的粘合被机械应力和热应力撕裂。已经发现了一种新的跨界面键合机制，其中在金属离子存在下，基材上的酸官能硅烷通过离聚物键合到聚合物中的酸基团。离聚物在高温和高剪切条件下是流体，但在室温下改革为坚韧的防水结构。
—Silane coupling agents have been developed for bonding virtually all thermoset and thermoplastic polymers to glass and metal surfaces. Bonding to the polymer is generally through interdiffusion of oligomeric siloxanes at the interface with possible crosslinking to interpenetrating polymer networks in the interphase region. Such structures provide very stable, water-resistant bonds across the interfaces for composites prepared under low shear. Under high shear, such as in injection molding, the bonds that are initially formed are torn by mechanical and thermal stress. A new mechanism of bonding across the interface has been discovered in which acid-functional silanes on the substrate bond to acid groups in the polymer in the presence of metal ions through ionomer bonds. Ionomers are fluid under conditions of high temperature and high shear, but reform at room temperature to tough water-resistant structures.