Rheological behaviors and structural transitions in a polyethersulfone modified epoxy system during phase separation

POLY 190

Shanjun Li, sjli@fudan.edu.cn1, Yingfeng Yu2, Minghai Wang2, and Guozhu Zhan2. (1) Department of macromolecular Science and Laboratory of Macromolecular Engineering of Polymers, Fudan University, No.220 Handan Road, Shanghai, 200433, China, (2) Department of Macromolecular Science and The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Fudan University, No.220 Handan Road, Shanghai, 200433, China
The rheological behaviors and gelation transitions in a polyethersulfone (PES) modified epoxy system during phase separation were studied by rheometry, time resolved light scattering (TRLS) and Differential Scanning Calorimetry (DSC). Two separate structural transitions in the curing process of the blend were identified as the first one due to phase separation and the second one related to crosslinking reaction of epoxy resin. Both structural transition times at different temperatures could be described well by the Arrhenius type equation. The complex viscosity exhibits an exponential growing process during phase separation at various temperatures, correlating to the light scattering results. The exponential behavior of complex viscosity could be attributed to the viscoelastic flow of epoxy-rich escaping from PES-rich during phase separation process.
 

General Papers: Functional Materials
6:00 PM-8:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Polymer Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007