The isothermal curing of melamine resin is investigated by in-line infrared spectroscopy at different temperatures. The infrared spectra are decomposed into time courses of characteristic spectral patterns using Multivariate Curve Resolution (MCR). It was found that depending on the applied curing temperature, melamine films with different spectral fingerprints and correspondingly different chemical network structures are formed. The network structures of fully cured resin films are specific for the applied curing temperatures used and cannot simply be compensated by changes in the curing time. For industrial curing processes, this means that cure temperature is the main system determining factor at constant M:F ratio. However, different MF resin networks can be specifically obtained from one and the same melamine resin by suitable selection of the curing time and temperatures profiles to design resin functionality. The spectral fingerprints after short curing time as well as after long curing time reflect the fundamental differences in the thermoset networks that can be obtained with industrial short-cycle and multi-daylight presses.

通过在线红外光谱研究了三聚氰胺树脂在不同温度下的等温固化。使用多元曲线分辨率 (MCR) 将红外光谱分解为特征光谱模式的时间进程。研究发现，根据所施加的固化温度，会形成具有不同光谱指纹和相应不同化学网络结构的三聚氰胺薄膜。完全固化树脂薄膜的网络结构特定于所用的固化温度，不能简单地通过固化时间的变化来补偿。对于工业固化过程，这意味着固化温度是恒定 M:F 比率的主要系统决定因素。然而，可以通过合适的固化时间和温度曲线选择树脂函数，从一个和相同的三聚氰胺树脂中具体从一个和相同的三聚氰胺网络获得不同的MF树脂网络。短固化时间和长固化时间后的光谱指纹反映了工业短周期和多日光印刷机可以获得的热固性网络的根本差异。