Further insight on amine-metal reaction in epoxy systems

摘要: Abstract Among thermosetting polymers, epoxy resins are major components of adhesives, sealants, paints and composites. Polymerization is often achieved by reaction monomers like DGEBA with amine hardeners such as DETA. Previous works showed that polyamines interact metal (hydr/oxide) substrates leading to the formation an interphase involving chelation surface ions. In this work, we further explored interaction between DETA aluminum (hydr)oxide, denoted Al, via a combined experimental modeling approach. We inspected in depth DSC modifications glass transition temperature Tg change heat capacity ΔCp after curing, allowing us quantifying impact Al amount on DGEBA/DETA degree cure α. A new parameter, “percentage inhibition cure” α ¯ , was defined reaching up ~4 % our conditions. parallel, situ mixing calorimetry confirmed exothermic character various degrees division. DFT calculations were carried out examine DETA/Al3+ chelates. plausible chelate configurations, one associated lower conformational energy shorted Al-N bond lengths, suggesting greater stability. Calculated Raman spectra additionally investigated, discuss about chelates at play.