CTBN rubber phase precipitation in model epoxy resins
| Autor: | Wayne D. Cook, Andy A Goodwin, C W Wise |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry technology industry and agriculture Dynamic mechanical analysis Epoxy Polymer complex mixtures body regions Natural rubber chemistry visual_art Phase (matter) Materials Chemistry visual_art.visual_art_medium Composite material Nitrile rubber Glass transition psychological phenomena and processes Curing (chemistry) |
| Zdroj: | Polymer. 41:4625-4633 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/s0032-3861(99)00686-2 |
| Popis: | This study investigated the precipitation of three types of end-functionalised liquid rubber (two CTBN and one ATBN) from two homologous series of amine-cured epoxy polymers with variable cross-link density. The CTBN carboxyl endgroups strongly enhanced the curing rate through the impurity catalysis mechanism, however, the amino-terminated ATBN only retarded the reaction, possibly by dilutional effects or owing to changes in the dielectric constant of the reacting medium. The glass transition temperature (Tg) of the epoxy phase was depressed by CTBN rubber dissolved in the epoxy matrix and the Tg of the CTBN rubber was also lowered. The height of the DMTA rubber peak was a linear function of the level of CTBN and suggested that ca. 3% of the rubber was dissolved in the cured epoxy matrix. The microstructure of the rubber particles was studied by SEM and related to the kinetics and thermodynamics of phase separation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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