New thermosets obtained from DGEBA and Meldrum acid with lanthanum and ytterbium triflates as cationic initiators
作者： Lidia González , Xavier Ramis , Josep Maria Salla , Angels Serra , Ana Mantecón
DOI: 10.1016/J.EURPOLYMJ.2008.02.019
关键词: Curing (chemistry) 、 Thermosetting polymer 、 Sulfonate 、 Epoxy 、 Fourier transform infrared spectroscopy 、 Polymer chemistry 、 Cationic polymerization 、 Materials science 、 Trifluoromethanesulfonate 、 Thermal stability
摘要: Abstract Ytterbium and lanthanum triflates were used as cationic initiators to cure mixtures of diglycidylether bisphenol A (DGEBA) Meldrum acid (MA) in several proportions comonomers initiators. The evolution epoxy lactone groups during curing, linear ester formed the final materials evaluated by Fourier transform infrared attenuated-total-reflection mode (FTIR/ATR). global curing process was investigated calorimetric analysis activation energy calculated isoconversional procedures. Shrinkage on thermal degradability varying initiator proportion evaluated. expandable character MA confirmed. obtained more degradable than conventional resins due tertiary incorporated into network copolymerization, especially those with ytterbium triflate. On increasing also increased.
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