Influence of the proportion of ytterbium triflate as initiator on the mechanism of copolymerization of DGEBA epoxy resin and γ-butyrolactone

摘要: Non-isothermal differential scanning calorimetry (DSC) experiments were performed to study the kinetics of curing process mixtures diglycidylether bisphenol A (DGEBA) and γ-butyrolactone (γ-BL) with ytterbium triflate as an initiator. It can be deduced that cured material consists epoxide homopolymers incorporated poly(ether-ester) unities, which come from lactone into network. The kinetic parameters, obtained using non-isothermal isoconversional procedure, show not only importance proportion initiator but also influence on polymerization DGEBA. homopolymerization DGEBA catalyzed by has activation energy 85.3 kJ mol−1, decreases 68.2 mol−1 in presence forming copolymers. Analysis DSC FTIR data showed that, when was increased, reaction accelerated mechanism cationic non-linear named activated monomer (AM) became more evident than chain-end (ACE). Finally, energies pre-exponential factors determined for both mechanisms.