The effect of stoichiometry on curing and properties of epoxy–clay nanocomposites View Full Text


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Article Info

DATE

2012-05

AUTHORS

M. A. García del Cid, M. G. Prolongo, C. Salom, C. Arribas, M. Sánchez-Cabezudo, R. M. Masegosa

ABSTRACT

Epoxy–clay nanocomposites have been prepared with an organically modified montmorillonite. The epoxy network was based on diglycidyl ether of bisphenol A (DGEBA) cured with diaminodiphenylmethane (DDM). The stoichiometry DGEBA–DDM was varied, the molar ratio of amine hydrogen/epoxy groups, r, ranged from 0.85 to 1.15. The influence of stoichiometry on curing and properties of the nanocomposites was studied using differential scanning calorimetry, dynamic mechanical thermal analysis and X-ray diffraction. All nanocomposites had intercalated clay structures. The clays accelerated the curing reaction whose rate was also increased when increasing r. The heat of reaction, −ΔH (J/g epoxy), increased as r increased, reaching a constant value for r ≥ 1. In the presence of clays −ΔH was lower than in the neat DGEBA–DDM. The glass transition temperature (Tg) of the neat epoxy thermosets reached a maximum at r = 1; however, the nanocomposites showed the Tg maximum at 0.9 < r < 1. The presence of clay lowered the Tg for r > 0.94 and raised Tg for r ≤ 0.85. The elastic modulus of neat epoxy thermosets reached a maximum in the rubber state and a minimum in the glassy state at r = 1. The nanocomposites showed similar behavior, but the maximum and the minimum values of the elastic modulus were reached at stoichiometry r < 1. The comparison of the properties of neat epoxy with those of the nanocomposites varying the stoichiometry indicates that the clay itself induces stoichiometric changes in the system. More... »

PAGES

741-749

References to SciGraph publications

  • 2007-01. On the effect of montmorillonite in the curing reaction of epoxy nanocomposites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2005-07. DSC study of cure kinetics of DGEBA-based epoxy resin with poly(oxypropylene) diamine in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2005. Epoxy Layered Silicate Nanocomposites in INORGANIC POLYMERIC NANOCOMPOSITES AND MEMBRANES
  • 2010-12. Correlations between the morphology and the thermo-mechanical properties in poly(vinyl acetate)/epoxy thermosets in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2006-12. Cure kinetics of epoxy resin and thermoplastic polymer in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2012-05. Effect of the epoxy/amine stoichiometry on the properties of carbon nanotube/epoxy composites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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    http://scigraph.springernature.com/pub.10.1007/s10973-012-2215-8

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    36 schema:description Epoxy–clay nanocomposites have been prepared with an organically modified montmorillonite. The epoxy network was based on diglycidyl ether of bisphenol A (DGEBA) cured with diaminodiphenylmethane (DDM). The stoichiometry DGEBA–DDM was varied, the molar ratio of amine hydrogen/epoxy groups, r, ranged from 0.85 to 1.15. The influence of stoichiometry on curing and properties of the nanocomposites was studied using differential scanning calorimetry, dynamic mechanical thermal analysis and X-ray diffraction. All nanocomposites had intercalated clay structures. The clays accelerated the curing reaction whose rate was also increased when increasing r. The heat of reaction, −ΔH (J/g epoxy), increased as r increased, reaching a constant value for r ≥ 1. In the presence of clays −ΔH was lower than in the neat DGEBA–DDM. The glass transition temperature (Tg) of the neat epoxy thermosets reached a maximum at r = 1; however, the nanocomposites showed the Tg maximum at 0.9 < r < 1. The presence of clay lowered the Tg for r > 0.94 and raised Tg for r ≤ 0.85. The elastic modulus of neat epoxy thermosets reached a maximum in the rubber state and a minimum in the glassy state at r = 1. The nanocomposites showed similar behavior, but the maximum and the minimum values of the elastic modulus were reached at stoichiometry r < 1. The comparison of the properties of neat epoxy with those of the nanocomposites varying the stoichiometry indicates that the clay itself induces stoichiometric changes in the system.
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