Non-isothermal free-models kinetic analysis on crystallization of europium-doped phosphate glasses

Sava, Bogdan Alexandru; Elisa, M.; Bartha, Cristina; Iordanescu, R.; Feraru, I.; Plapcianu, C.; Pătraşcu, Roxana

doi:10.1016/j.ceramint.2014.04.089

Cited by 10 publications

(2 citation statements)

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“…The activation energies increases with increase in conversion in the range 0.05 < α < 0.80, with the maximum value at 532 kJ mol −1 and demonstrates the complex nature of thermal decomposition of the poly(1‐octene‐ co ‐BMA) copolymer . Subsequent to the initial decomposition of weak linkages the activation energy increases at the later stages of decomposition …”

Section: Resultsmentioning

confidence: 99%

“…This analysis is based on F ‐test on fit quality for thermogravimetric curves, and the principle of selection is based on the best possible process mechanism corresponding to the best agreement between E FR = E FR ( α ) (where, E FR is the activation energy calculated from isoconversional method of FR, α is the degree of conversion). The best fit data was obtained from nonisothermal experimental data and actual activation energy values obtained by applying the differential methods of isothermal data simulated by the software using nonisothermal kinetic parameters . After simulation of the experimental data for 0.05 ≤ α ≤ 0.80, the selection of the best fit model was done by the Netzsch software programme.…”

Section: Resultsmentioning

confidence: 99%

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Controlled copolymerization of 1‐octene and butyl methacrylate via RAFT and their nonisothermal model‐free thermokinetic decomposition study

Saikia

Baruah

Borphukan

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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Reversible addition fragmentation chain transfer (RAFT) copolymerization of 1-octene and butyl methacrylate (BMA) was carried out for the first time using 4-cyano-4-(phenylcarbonothioylthio) pentanoic acid as RAFT agent in N,N 0 -dimethyl formamide. Poly (1-octene-co-BMA) copolymers with well-controlled molecular weights and narrow molecular weight distribution were obtained throughout the polymerization. The copolymers have been well characterized by different analytical techniques such as SEC, FT-IR, NMR, SEM, AFM, XRD, and TG analyses. FT-IR and NMR analyses confirmed the synthesis of poly(1-octene-co-BMA) copolymers. SEM and AFM analyses demonstrated the wavy-lamellar morphological structure of the copolymers. Thermogravimetric analysis revealed good thermal stability of poly(1-octene-co-BMA) copolymers synthesized via RAFT mediated polymerization. The thermokinetic parameters were evaluated by adopting model-free methods of Friedman and Flynn-Wall-Ozawa using the nonisothermal thermogravimetric data. The multivariate nonlinear regression analysis established the most appropriate kinetic model and the corresponding kinetic parameters of thermal decomposition of poly (1-octene-co-BMA) copolymers were also calculated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%