氨基聚酯树脂固化过程的FTIR跟踪

The Trace of the Curing Process of Polyester/Mel amine Resins by FTIR

用FTIR内标法跟踪氨基聚酯树脂的固化过程,选取815cm^(-1)的三嗪环面外振动峰作内标峰,913cm^(-1)处的甲氧基变形振动峰和3500cm^(-1)左右的羟基伸缩振动峰为特征吸收峰。结果表明,随着固化的进行,涂膜的羟基、甲氧基和羧基递减,醚键和羰基递增,说明固化过程是以交联反应为主,伴有自缩合反应和酯化反应的复杂过程。

The curing process of polyester/melamine resins is investigated with FTIR in this paper. The peak at 913 cm-1 assigned to deformation of methoxy and the peak at 3500 cm-1 assigned to the stretching of hydroxyl were chosen as characteristic changes and the peak at 815 cm-1 assigned to the vibration (out-of-plane) of triazine was chosen as the internal sign in the curing process of polyester/melamine resins. The results show that the numbers of hydroxyl groups, methoxy groups and carboxyl groups are gradually reduced and the numbers of ether bonds and carbonyl groups are gradually increased along with the curing process, which indicates that the curing is a complex process of crosslinking accompanied by self-condensation and esteri-fication. The curing speed of polyester/melamine resins is related to [OH]/[OCH3] ratio.