Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 108, Issue 20, Pages 6208-6215Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp036628o
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The polymerization-induced phase-separation process of polyethersulfone (PES)-modified epoxy systems was monitored in situ continuously on a single sample throughout the entire curing process by using optical microscopes, time-resolved light scattering (TRLS), scanning electronic microscopes (SEM), and a rheometry instrument. At specific PES content a viscoelastic transformation process of phase inversion morphology to bicontinuous was found with an optical microscope. The theological behavior during phase separation corresponds well with the morphology development. Light-scattering results monitoring the phase-separation process of systems with final phase inversion morphology show a typical exponential decay procedure of scattering vector q(m). The characteristic relaxation time of phase separation can be described well by the WLF equation.
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