Determination of the Degree of Cure of Thermosetting Resins Using IR-Spectroscopy and Differential Scanning Calorimetry
Abstract
Polymer resins of three classes (cyanate ester, epoxy and diphthalonitrile) are used to compare polymerization indices determined for different stages of cure using IR-spectroscopy and differential scanning calorimetry (DSC). The value of the cure degree (CD) determined by DSC is shown to be higher than that obtained by IR-spectroscopy, the difference in some cases exceeding 25%. The error of determination for different resins essentially depends on the method thus used up to complete invalidity and nonapplicability of DSC to CD determination for phthalonitrile resin. The fundamental methodological difference between polymerization indices determined by IR-spectroscopy and DSC is shown. IR spectroscopy (and other spectroscopic methods) provides information about the degree of component conversion and none about the possibility of further continuation of the reaction, whereas DSC method characterizes the cure process without a possibility of direct evaluation of the component conversion. Despite the identical definition those indices are not interchangeable but supplementary. We recommend to determine CD indices by different methods for complete and correct description of polymer resin condition.
About the Authors
A. A. Shimkin
Всероссийский НИИ авиационных материалов
Russian Federation
Russian Federation
T. A. Grebeneva
Всероссийский НИИ авиационных материалов
Russian Federation
Russian Federation
Yu. I. Merkulova
Всероссийский НИИ авиационных материалов
Russian Federation
Russian Federation
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Review
For citations:
Shimkin A.A., Grebeneva T.A., Merkulova Yu.I. Determination of the Degree of Cure of Thermosetting Resins Using IR-Spectroscopy and Differential Scanning Calorimetry. Industrial laboratory. Diagnostics of materials. 2017;83(8):27-32. (In Russ.)
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