Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain.
Appl Spectrosc. 2013 Dec;67(12):1427-36. doi: 10.1366/13-07169.
We present a novel methodology to simultaneously monitor of the degree of cure and curing shrinkage of thermosetting formulations. This methodology is based on the observation of changes in the infrared absorption of reactive functional groups and the groups used as a standard reference for normalization. While the optical path length is exact and controlled in transmission infrared spectroscopy, in attenuated total reflection Fourier transform infrared (ATR FT-IR), the exact determination of volume changes requires the measurement of the refractive indices of the studied system throughout the curing process or at least an indirect parallel measurement of this property. The methodology presented here allows one to achieve quantitative measurements of the degree of cure and shrinkage for thermosets using in situ ATR FT-IR spectroscopy.
我们提出了一种新的方法来同时监测热固性配方的固化程度和固化收缩率。该方法基于对反应性功能基团和用作归一化标准参考基团的红外吸收变化的观察。虽然在透射红外光谱中光程长度是精确且可控的，但在衰减全反射傅里叶变换红外光谱（ATR FT-IR）中，要精确确定体积变化，需要在整个固化过程中测量研究体系的折射率，或者至少对该性质进行间接平行测量。这里提出的方法可以使用原位 ATR FT-IR 光谱法对热固性进行定量测量固化程度和收缩率。
