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J Phys Chem B. 2004 May 20;108(20):6208-15. doi: 10.1021/jp036628o.

Polymerization-induced viscoelastic phase separation in polyethersulfone-modified epoxy systems.

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Department of Macromolecular Science and The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Fudan University, Shanghai, 200433, China.


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 rheological 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 qm. The characteristic relaxation time of phase separation can be described well by the WLF equation.

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