Effect of an organoclay on the reaction-induced phase-separation in a dynamically asymmetric epoxy/PCL system
| Autor: | J. Rotrekl, Jiří Dybal, Ivan Kelnar, Ludmila Kaprálková, Antonín Sikora |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Thermoplastic Polymers and Plastics General Chemical Engineering Thermosetting polymer lcsh:Chemical technology Nanocomposites chemistry.chemical_compound Critical point (thermodynamics) Phase (matter) Materials Chemistry lcsh:TA401-492 Organoclay lcsh:TP1-1185 Physical and Theoretical Chemistry Composite material Microstructure Curing (chemistry) chemistry.chemical_classification Organic Chemistry Epoxy Reaction induced phase separat chemistry visual_art Polycaprolactone visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials |
| Zdroj: | eXPRESS Polymer Letters, Vol 7, Iss 12, Pp 1012-1019 (2013) |
| Popis: | The addition of layered silicates can significantly affect the phase behaviour of both immiscible thermoplastic blends and partially miscible thermoset systems that undergo reaction-induced phase separation (RIPS) during curing. This study focuses on the phase behaviour of polycaprolactone (PCL)/epoxy in the presence of organically modified montmoril- lonite (oMMT). Due to the high dynamic asymmetry caused by the differences in the molecular weights and viscosities of the PCL and the uncured epoxy, the critical point is localised at low PCL concentrations, as indicated by the pseudophase diagram. The addition of oMMT to the system led to the marked shift of the critical point towards higher concentrations of PCL, with an increase in the oMMT content occurring as a consequence of the preferential localisation of the clay in the epoxy phase, making this phase more dynamically slow. Significant changes in morphology, including phase inversion of the PCL/epoxy systems caused by the presence of oMMT, were recorded for PCL concentrations ranging from 10 to 30%. |
| Databáze: | OpenAIRE |
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