醇酸树脂固化过程的FTIR跟踪

本文用FTIR内标法跟踪观察了醇酸树脂的固化过程,选取1600cm~(-1)处的苯环振动峰作内标峰。结果表明,随着固化的进行,不饱和键递减,涂膜的羧基、羟基等含氧基团递增。固化过程的快慢同涂膜厚度有关,它是受氧扩散作用控制的。

The Trace of the Curing Process of Alkyd Resin with FTIR

The curing process of alkyd resin is investigated with FT-IR in this paper. The vibration of unsaturated carbon-hydrogen bonds was chosen as the characteristic change at 3007 cm-1 and the stretching vibration of phenyl group at 1600 cm-1 was chosen as the internal standard sign in the curing process of alkyd resin. The results show that the number of unsaturated bonds gradually reduces and the number of the functional groups containing oxygen, such as hydroxyl groups and carboxyl groups, gradually increases along with the curing process which indicates that some oxygen has been absorbed into the film. The curing speed of alkyd resin is related to the thickness of alkyd resin film. The curing speed of alkyd resin is controlled by the diffusion process of oxygen.