Polymerization-induced viscoelastic phase separation in polyethersulfone-modified epoxy systems
作者：Yu, Y. F.; Wang, M. H.; Gan, W. J.; Tao, Q. S.; Li, S. J.
關鍵字：thermoplastics, thermoset, viscoelastic phase separation
論文來源：期刊
具體來源：Journal of Physical Chemistry B 2004, 108, (20), 6208-6215.
發(fā)表時間：2004年
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.