| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 봄 (04/11 ~ 04/12, 연세대학교) |
| 권호 | 28권 1호, p.86 |
| 발표분야 | 복합재료 |
| 제목 | Real Time Exfoliation Behavior of Clay Layers in Epoxy-Clay Nanocomposites |
| 초록 | Nanostructures in epoxy-clay nanocomposites were controlled by changing chemical and thermal curing conditions in the intergallery region. In this study, the exfoliated nanostructure was achieved either by retarding the cross-linking reaction in the extragallery region with low reactive aromatic diamine curing agent or by increasing curing temperature. It is interesting to note that the clay layers are exfoliated step-wise rather than gradually. Three steep increases of the interlayer distance were observed in the total epoxy-clay nanocomposite manufacturing process. The first increase comes from the intercalation of DGEBA into the intergallery region of C18 clay. The second increase is caused by the clay layer folding, translating and expanding from the self-polymerization of DGEBA with the catalytic effect of protonated C18 amine cation. The third increase takes place from the cross-linking of epoxy resin with C18 amine and the amine curing agent in the intergallery region. It is important to enhance the cross-linking in the intergallery region for the well-exfoliated nanostructure. As internal epoxy monomer is polymerizing and filling the free space in the intergallery region, the pressure is building on the clay layer without a significant change in nanostructure. When the pressure applied on the clay layer exceed a critical point to keep the current nanostructure, the intergallery region may be enlarged suddenly. |
| 저자 | 공도일;박찬언 |
| 소속 | 포항공과대 |
| 키워드 | epoxy nanocomposite; exfiliation kinetics |
