The use of real-time dielectric relaxation spectroscopy (DRS) for monitoring changes in molecular mobility during reaction for thermosetting systems is described together with phenomenological and molecular theories of the time-dependent relaxation functions that are involved. Reduced molecular mobility normally leads to the diffusion control of a reaction and ultimately to glass formation at the polymerization temperature . We present new DRS results for a boroxine/epoxide system that show glass formation below a `floor temperature' and very different behaviour above , when the dielectric properties become independent of time and an elastomer is formed.
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Williams et al. (1999) studied this question.
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