Investigation of curing an epoxy resin by the polarization current method
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1. An investigation of the curing kinetics of an epoxy resin by the polarization current method at constant temperature reveals, on the infralow frequency range f=0.001–1 Hz, the existence of a relaxation process which during polymerization changes shape and is shifted toward longer times.
2. In all stages of polymerization the frequency dependences of the complex dielectric constant are satisfactorily described by the Havriliak-Negami dispersion equation.
3. Whereas the dielectric characteristics on the audio- and radio-frequency range can be used to explore the initial stage of polymerization, the dielectric characteristics on the infralow frequency range can be used as a source of information on the state of the material in the final stages of cure (the end of the gelling period and the post-gelling phase). The characteristics that provide the most information are the spectrum parameters, which indicate three stages of polymerization.
KeywordsPolymerization Epoxy Dielectric Constant Constant Temperature Final Stage
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