Interrelations between mechanism, kinetics, and rheology in an isothermal cross-linking chain-growth copolymerisation
| Autor: | G. Van Assche, B. Van Mele, Els Verdonck |
|---|---|
| Přispěvatelé: | Physical Chemistry and Polymer Science |
| Rok vydání: | 2001 |
| Předmět: |
thermosets
Materials science Polymers and Plastics raman spectrometry Organic Chemistry Kinetics Isothermal process Styrene Chemical kinetics chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Polymerization Autoacceleration Polymer chemistry modulated temperature DSC (MTDSC) Ceramics and Composites Materials Chemistry reaction kinetics Vitrification Physical and Theoretical Chemistry |
| Zdroj: | Polymer. 42:2959-2968 |
| ISSN: | 0032-3861 |
| Popis: | The free radical chain-growth cross-linking copolymerisation of an unsaturated polyester resin with styrene is investigated in isothermal conditions using different techniques. By modulated temperature differential scanning calorimetry (MTDSC) the rate of polymerisation is observed simultaneously with the (partial) vitrification of the reacting material. An important autoacceleration closely before vitrification corresponds to an accelerating styrene consumption. The autoacceleration occurs long after the gelation of the material, which implies that termination reactions involving small radicals are still important at an advanced conversion. The deceleration of these termination reactions causes the autoacceleration, which is stopped when the propagation reaction slows down due to vitrification. MTDSC proves to be very suitable for studying the interrelations between vitrification and the polymerisation kinetics. |
| Databáze: | OpenAIRE |
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