A new laser scanning dilatometer, based on a simplified capillary‐type dilatometer using a laser scan micrometer for the detection of changes of the sample dimension, is described. The method can be applied to time‐resolved measurements of volume changes for transparent and nontransparent samples. The time resolution of the setup is below 1 s, the absolute error in determining the volume change is below 0.0004 cm3, and the accuracy of the measured shrinkage is better than 0.2 vol. %. The operation temperature ranges from room temperature to 160 °C. The setup has been applied to the investigation of the volume shrinkage during the curing of epoxy resins [diglycidyl ether of bisphenol A (DGEBA)] without and with fillers. Furthermore, the effect of a phase transformation on the volume has been demonstrated by the melting of a crystalline phase (succinic anhydride) dispersed in a DGEBA matrix due to the heat of reaction.
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Holst et al. (2005) studied this question.
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