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New curing agents for epoxy resins: protoporphyrins
Author(s) -
FragaLópez Francisco,
Vázquez Barreiro Eva C.,
Jover Aida,
Meijide Francisco,
Rodríguez Eugenio,
VázquezTato José
Publication year - 2018
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4118
Subject(s) - diglycidyl ether , curing (chemistry) , differential scanning calorimetry , epoxy , bisphenol a , enthalpy , materials science , polymer chemistry , nuclear chemistry , chemistry , composite material , physics , quantum mechanics , thermodynamics
Two similar macrocycles protoporphyrin IX and zinc protoporphyrin IX (ZPP) have been used as cross‐linking agents for curing the epoxy resin of bisphenol A diglycidyl ether (BADGE, n = 0). The enthalpies and the activation energies of the esterification reaction of the 2 systems are very close to each other. However, the temperature of the minimum in the differential scanning calorimetry thermogram is 38°C lower for BADGE (n = 0)/ZPP, thus requiring a less energy expenditure for curing the system. By the contrary, the enthalpy and activation energies for the etherification reaction are lower and higher, respectively, for BADGE (n = 0)/ZPP suggesting that the zinc ion affects it, although the involved mechanism is unknown.