New curing agents for epoxy resins: protoporphyrins. (8th August 2017)

• Record Type: Journal Article
• Authors: Fraga‐López, Francisco; Vázquez Barreiro, Eva C.; Jover, Aida; Meijide, Francisco; Rodríguez, Eugenio; Vázquez‐Tato, José
• Is Part Of: Polymers for advanced technologies. Volume 29:Number 1(2018)
• Page Start: 329
• Page End: 336
• Publication Date: 2017-08-08
• Subjects: epoxy resin -- protoporphyrin IX -- zinc protoporphyrin IX -- Zn ion; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.4118
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract : 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.