Abstract
The effect of composition and reactive group (-COOH) content of reactive polysulfone (PSF) on the structure development of epoxy (EP)/PSF blends was investigated. The EP/PSF mixture, exhibited a LCST-type phase behavior. The morphology was measured by optical microscope. At the early stage of curing, the EP/PSF mixtures were homogeneous and transparent. By adding reactive PSF, the LCST shifts to high temperature region. It is caused by the increase of miscibility between the two phase due to in-situ formation of EP-PSF graft copolymer via the reaction of EP with reactive PSF. The phase-separated structure having small periodic distance was obtained by adding reactive PSF. The structure coarsening at final stage is delayed by in-situ formation of PSF-EP graft copolymer so that the phase-separated structure can be fixed at the early stage of spinodal decomposition by the gelation of EP-rich phase.
| Original language | English |
|---|---|
| Pages (from-to) | 588-595 |
| Number of pages | 8 |
| Journal | Polymer (Korea) |
| Volume | 22 |
| Issue number | 4 |
| State | Published - 1998 |
Keywords
- Gelation
- In-situ formed EP-PSF graft copolymer
- Phase-separation
- Reactive PSF