Phenol-urea-formaldehyde (PUF) resin is one of the most important thermosetting polymers. It is widely used in many industrial and construction applications as an organic coating and adhesive. For example, in production of mineral wool for insulation, PUF is used together with the coupling agent (3-aminopropylsilane, APS) and serves as a binder for attaching mineral fibers to each other and to create the necessary mechanical integrity and shape of the final product. However, during ageing under high humidity (95%) and temperature (70 °C), hydrolysis can degrade PUF, decreasing product quality. A better understanding of the chemical processes caused by hydrolysis would promote development of more stable PUF binders. We investigated the composition and stability changes during ageing of cured PUF powder binder and mineral wool fibers where PUF binds the fibers together. We aged the samples in hot water (80 °C) or in a controlled climate chamber (70 °C; 91% RH) and analyzed them using X-ray photoelectron spectroscopy (XPS), element analysis and thermogravimetric (TG) analysis. We investigated the composition of species released from PUF during hydrolysis by electrospray ionization (ESI) of the aqueous solutions. The results show that the extent of PUF curing and the presence of APS as the coupling agent have an important impact on its stability. XPS revealed that poorly cured PUF contains a high fraction of

酚-脲-甲醛（PUF）树脂是最重要的热固性聚合物之一。它广泛用作许多工业和建筑应用中的有机涂料和粘合剂。例如，在用于绝缘的矿棉生产中，PUF与偶联剂（3-氨基丙基硅烷，APS）一起使用，并用作将矿物纤维彼此连接的粘合剂，以形成最终成品所需的机械完整性和形状产品。但是，在高湿度（95％）和温度（70°C）下老化的过程中，水解会降解PUF，从而降低产品质量。更好地理解由水解引起的化学过程将促进开发更稳定的PUF粘合剂。我们研究了固化的PUF粉末粘合剂和矿棉纤维（在其中PUF将纤维粘合在一起）的老化过程中的组成和稳定性变化。我们在热水（80°C）或可控气候室（70°C; 91％RH）中对样品进行了时效处理，并使用X射线光电子能谱（XPS），元素分析和热重分析（TG）对其进行了分析。我们通过水溶液的电喷雾电离（ESI）研究了水解过程中从PUF释放的物质的组成。结果表明，PUF固化的程度和APS作为偶联剂的存在对其稳定性有重要影响。XPS显示，固化不良的PUF含有较高比例的 相对湿度为91％），并使用X射线光电子能谱（XPS），元素分析和热重分析（TG）对其进行了分析。我们通过水溶液的电喷雾电离（ESI）研究了水解过程中从PUF释放的物质的组成。结果表明，PUF固化的程度和APS作为偶联剂的存在对其稳定性有重要影响。XPS显示，固化不良的PUF含有较高比例的 相对湿度为91％），并使用X射线光电子能谱（XPS），元素分析和热重分析（TG）对其进行了分析。我们通过水溶液的电喷雾电离（ESI）研究了水解过程中从PUF释放的物质的组成。结果表明，PUF固化的程度和APS作为偶联剂的存在对其稳定性有重要影响。XPS显示，固化不良的PUF含有较高比例的