Isothermal and nonisothermal cure kinetics of an epoxy/poly(oxypropylene)diamine/octadecylammonium modified montmorillonite system

Abstract

ABSTRACT:The effect of an octadecylammonium-exchanged montmorillonite on the curing kinetics of a thermoset system based on a bisphenol A epoxy resin and a poly(oxypropylene)diamine curing agent were studied with differential scanning calorimetry (DSC) in isothermal and dynamic (constant-heating-rate) conditions. Montmorillonite and the prepared composites were characterized by X-ray diffraction analysis and simultaneous DSC and thermogravimetric analysis. The analysis of the DSC data indicated that the intercalated octadecylammonium cations catalyzed the epoxy-amine polymerization. A kinetic model, arising from an autocatalyzed reaction mechanism, was applied to the DSC data. Fairly good agreement between the experimental data and the modeling data was obtained.

Thermoset Polymer Matrix Composites of Epoxy, Unsaturated Polyester, and Novolac Resin Embedding Construction and Demolition Wastes powder: A Comparative Study

“…Finally, the amorphous phase peaks of UP–CDW40-500 μm and UP–CDW40-300 μm were approximated at 2θ = 19.95° (Figure 9a,b). The amorphous phase 2θ values measured for ER, UP, and N composites fall within a corresponding range of values that are recorded and referred to in the literature [76,77,78,79,80,81,82,83,84,85].…”

Thermoset Polymer Matrix Composites of Epoxy, Unsaturated Polyester, and Novolac Resin Embedding Construction and Demolition Wastes powder: A Comparative Study

“…Finally, the amorphous phase peaks of UP–CDW40-500 μm and UP–CDW40-300 μm were approximated at 2θ = 19.95° (Figure 9a,b). The amorphous phase 2θ values measured for ER, UP, and N composites fall within a corresponding range of values that are recorded and referred to in the literature [76,77,78,79,80,81,82,83,84,85].…”

Thermal degradation kinetics of epoxy/organically modified montmorillonite nanocomposites

“…The materials were investigated by means of X‐ray diffraction (XRD), as reported previously 22, 23. The initial d ‐spacing of the OMMTs was determined to be 21.9 Å for octadecylamine‐modified montmorillonite and 16.3 Å for poly(oxypropylene) diamine modified montmorillonite.…”

Modification of montmorillonite by quaternary polyesters

“…The interlaying spacing in intercalated nanocomposites also depends on the type of modifier, which strongly influences the nanocomposite's mechanical properties [9]. In our previous studies montmorillonite was modified by octadecylammonium, poly(oxypropylene)diamine, and liquid crystalline diol hydrochlorides [10][11][12].…”

Thermoset Polymer Matrix Composites of Epoxy, Unsaturated Polyester, and Novolac Resin Embedding Construction and Demolition Wastes powder: A Comparative Study

“…Finally, the amorphous phase peaks of UP–CDW40-500 μm and UP–CDW40-300 μm were approximated at 2θ = 19.95° (Figure 9a,b). The amorphous phase 2θ values measured for ER, UP, and N composites fall within a corresponding range of values that are recorded and referred to in the literature [76,77,78,79,80,81,82,83,84,85].…”

Thermal degradation kinetics of epoxy/organically modified montmorillonite nanocomposites

“…The materials were investigated by means of X‐ray diffraction (XRD), as reported previously 22, 23. The initial d ‐spacing of the OMMTs was determined to be 21.9 Å for octadecylamine‐modified montmorillonite and 16.3 Å for poly(oxypropylene) diamine modified montmorillonite.…”

Modification of montmorillonite by quaternary polyesters

“…The interlaying spacing in intercalated nanocomposites also depends on the type of modifier, which strongly influences the nanocomposite's mechanical properties [9]. In our previous studies montmorillonite was modified by octadecylammonium, poly(oxypropylene)diamine, and liquid crystalline diol hydrochlorides [10][11][12].…”

Thermoset Polymer Matrix Composites of Epoxy, Unsaturated Polyester, and Novolac Resin Embedding Construction and Demolition Wastes powder: A Comparative Study

“…Finally, the amorphous phase peaks of UP–CDW40-500 μm and UP–CDW40-300 μm were approximated at 2θ = 19.95° (Figure 9a,b). The amorphous phase 2θ values measured for ER, UP, and N composites fall within a corresponding range of values that are recorded and referred to in the literature [76,77,78,79,80,81,82,83,84,85].…”

Thermal degradation kinetics of epoxy/organically modified montmorillonite nanocomposites

“…The materials were investigated by means of X‐ray diffraction (XRD), as reported previously 22, 23. The initial d ‐spacing of the OMMTs was determined to be 21.9 Å for octadecylamine‐modified montmorillonite and 16.3 Å for poly(oxypropylene) diamine modified montmorillonite.…”

Modification of montmorillonite by quaternary polyesters

“…The interlaying spacing in intercalated nanocomposites also depends on the type of modifier, which strongly influences the nanocomposite's mechanical properties [9]. In our previous studies montmorillonite was modified by octadecylammonium, poly(oxypropylene)diamine, and liquid crystalline diol hydrochlorides [10][11][12].…”