Abstract
Density measurements were used to obtain the direct evidence of the volumetric expansion during the polymerization of new catalytic (N-benzylpyrazinium hexafluoroantimonate, BPH) epoxy thermosetting system. The density curve of the sample containing 0.5 wt% BPH showed the independence of the reaction time, while the density of the sample containing 3.0 wt% BPH increased with the reaction time at 150°C. The volumetric expansion of BPH/epoxy mixture could be explained by the molecular packing owing to inter- and intramolecular hydrogen bonding. The FT-IR spectra of 3.0 wt% BPH/epoxy mixture showed an increase in the peak intensity of hydrogen-bonded hydroxyl group with the increase of reaction time at 150°C. The concentration dependence on the volumetric expansion is well described that the curing process might lead to more network structure inducing changes in inter- and intramolecular hydrogen bonding at higher concentration of BPH.
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Kim, Y., Lee, JR. Evidence for the Volumetric Expansion of N-Benzylpyrazinium Hexafluoroantimonate and Epoxy Mixture during Curing Reaction. Polym J 30, 925–928 (1998). https://doi.org/10.1295/polymj.30.925
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DOI: https://doi.org/10.1295/polymj.30.925