نتایج جستجو برای: isoconversional methods
تعداد نتایج: 1874444 فیلتر نتایج به سال:
The cure kinetics of polydicyclopentadiene (pDCPD) prepared by ringopening metathesis polymerization with three different concentrations of Grubbs’ catalyst was examined using differential scanning calorimetry (DSC). The experimental data were used to test several different phenomenological kinetic models. The data are best modeled with a “model-free” isoconversional method. This analysis revea...
Article history: Differences in the activation e Received 22 July 2008 Received in revised form 9 February 2009 Accepted 10 February 2009 Available online 20 February 2009
Pressure effects on the thermal decomposition reactions: A thermo-kinetic investigation Anuj A. Vargeese* A. Theoretical background of kinetic analysis Vyazovkin’s non-linear integral Method Vyazovkin’s method is a non-linear integral isoconversional method which can be used for nonisothermal experiments. Vyazovkin’s method provides more precise apparent activation energy values by performing n...
The cure kinetics of polydicyclopentadiene prepared by ring-opening metathesis polymerization with three different concentrations of Grubbs’ catalyst were examined with differential scanning calorimetry. The experimental data were used to test several different phenomenological kinetic models. The data were best modeled with a model-free isoconversional method. This analysis revealed that the a...
In this work, thermal degradation behavior of a solid composite propellant containing Epoxy/Ammonium perchlorateStrontium nitrateAnthracene composite was studied by simultaneous thrmogravimetric analysis and differential scanning calorimetry under dynamic nitrogen atmosphere at different heating rates. Variation curves of the thermal degradation activation energy of EpoxyAmmonium perchlorateStr...
The parameters obtained from a kinetic analysis of thermoanalytical data often exhibit a conversion-dependent behavior. A novel incremental isoconversional method able to deal with this phenomenon is proposed. The kinetic model is directly fitted to the experimental data using nonlinear orthogonal least squares procedure. The data are processed without transformations, so their error distributi...
Electrically conductive adhesives (ECA) are an alternative interconnection method for crystalline silicon solar cells, providing low thermomechanical stress, being lead-free and applicable to new contact structures. The ability to control their curing reaction in a stringing or lamination process is essential for enabling cost effective and reliable industrial module production. We set up an au...
Oxygen release from metal oxides at high temperatures is relevant to many thermally activated chemical processes, including chemical-looping combustion, solar thermochemical cycles and energetic thermite reactions. In this study, we evaluated the thermal decomposition of nanosized metal oxides under rapid heating (~10(5) K s(-1)) with time-resolved mass spectrometry. We found that the effective...
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