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Mechanistic study of thermal behavior and combustion performance of epoxy resins: I homopolymerized TGDDM
Author(s) -
Levchik Sergei V.,
Camino Giovanni,
Luda Maria Paola,
Costa Luigi,
Costes Bruno,
Henry Yves,
Morel Emile,
Muller George
Publication year - 1995
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.1995.220060201
Subject(s) - materials science , epoxy , thermal , combustion , composite material , polymer science , polymer chemistry , chemical engineering , organic chemistry , chemistry , engineering , thermodynamics , physics
Tetraglycidyl 4,4′‐diaminodiphenylmethane (TGDDM) undergoes homopolymerization on heating. Intramolecular reactions which compete with crosslinking favor the formation of cyclic structures with increasing thermal and fire resistance of the resin, whereas physical mechanical properties tend to decrease. The mechanism of thermal decomposition of TGDDM is studied by thermogravimetry, differential scanning calorimetry and thermal volatilization analysis with characterization of volatiles evolved and residue left. Thermal degradation of poly‐(TGDDM) starts at 260°C with elimination of water from secondary alcoholic groups which is a typical pathway for epoxy resin degradation. Resulting unsaturations weaken bonds in the β‐position and provoke the first chain breaking at allyl–amine and allyl–either bonds. With increasing temperature, saturated alkyl–ether bonds and alkyl carbon–carbon bonds are broken first, followed by the most stable alkyl–aryl bonds at T>365°C. The combustion performance of TGDDM is discussed on the basis of the thermal degradation behavior.