Reactions of trithiocyanuric acid with oxiranes. II. Kinetics and mechanism of reactions

Kucharski, Mieczysław; Chmiel-Szukiewicz, Elżbieta

doi:10.1002/1097-4628(20001213)78:12<2081::aid-app40>3.0.co;2-q

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…This is taken as the average value obtained for three different temperatures. The curves, obtained with the long-time isothermal scanning, were used to determine the degree of conversion and rate of cure using the traditional procedure of the reaction heat evaluation. , Typical plots of conversion (α) versus time of the neat epoxy cured at various temperatures of study are shown in Figure a. The conversion (α) is calculated from the ratio of the heat of cure at time, t , over the total heat generated by the epoxy-anhydride reaction.…”

Section: Resultsmentioning

confidence: 99%

In-situ Cure and Cure Kinetic Analysis of a Liquid Rubber Modified Epoxy Resin

Thomas¹,

Sinturel²,

Pionteck³

et al. 2012

Ind. Eng. Chem. Res.

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The in-situ cure and cure kinetics of an epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) polymerized with an anhydride hardener and its mixtures with a liquid polybutadiene rubber having hydroxyl functionality (HTPB) were studied using Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) in an isothermal mode. The cure reaction was monitored in-situ by FTIR spectroscopy by observing variation in intensity of epoxy, anhydride, and ester bands. The cure reaction mechanisms by which the network structure of epoxy was developed were discussed. Isothermal mode DSC measurements were performed at selected temperatures. The reaction followed an autocatalytic mechanism, and kinetic analysis was done by a phenomenological model developed by Kamal. Good fits were obtained between the autocatalytic model and the experimental data up to the vitrification state. Afterward, the reaction became diffusion controlled. The reaction during the later stages of cure was explained by introducing a diffusion factor, which agreed well with the kinetic data. The nature of the developing morphology of modified epoxies was analyzed by optical microscopy (OM) and small angle laser light scattering (SALLS) technique. The ultimate morphology of the cured blends was analyzed using scanning electron microscopy (SEM). The cure kinetics has been correlated with the developed morphology to get insight into the mechanism of reaction-induced microphase separation.

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Section: Resultsmentioning

confidence: 99%

In-situ Cure and Cure Kinetic Analysis of a Liquid Rubber Modified Epoxy Resin

Thomas¹,

Sinturel²,

Pionteck³

et al. 2012

Ind. Eng. Chem. Res.

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“…In previous articles, the kinetics and mechanism of the addition of TTCA to oxiranes have been described 3. In this article, only the initial stages of the reaction of TTCA with PO and ECH are described.…”

Section: Introductionmentioning

confidence: 98%

Thermally stable red electroluminescent hybrid polymers derived from functionalized silsesquioxane and 4,7‐bis(3‐ethylhexyl‐2‐thienyl)‐2,1,3‐benzothiadiazole

Xiao

Tan

et al. 2009

J. Polym. Sci. A Polym. Chem.

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Hyperbranched organic–inorganic hybrid conjugated polymers P1 and P2 were prepared via FeCl3‐oxiditive polymerization of 4,7‐bis(3‐ethylhexyl‐2‐thienyl)‐2,1,3‐benzothiadiazole (A) and octa(3‐ethylhexyl‐2‐thienyl‐phenyl)polyhedral oligomeric silsesquioxane (POSS) (B) at different POSS concentrations. Compared to linear polymer PM derived from A, P1, and P2 exhibit much higher PL quantum efficiency (ϕPL‐f) in condensed state with improved thermal stability. ϕPL‐f of P1 and P2 increased by 80% and 400%, and the thermal degradation temperatures of P1 and P2 are increased by 35 °C and 46 °C, respectively. Light‐emitting diodes were fabricated using P1, P2, and PM. While the electroluminescent spectra of both P1 and PM show λmax at 660 nm, P1 exhibits a much narrower EL spectrum and higher electroluminescence (∼500%) compared with PM at a same voltage and film thickness. The maximum current efficiency of P1 is more than seven times of that of PM. The turn‐on voltages of the LEDs are in the order of P2 > PM > P1. LED prepared by blending P1 with MEH‐PPV shows a maximum luminescence of 2.6 × 103 cd/m2 and a current efficiency of 1.40 cd/A, which are more than twice (1.1 × 103 cd/m2) and five times (0.27 cd/A) of LED of PM/MEH‐PPV blend, respectively. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5661–5670, 2009

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“…As previously described, 1, 2 reactions of trithiocyanuric acid (TTCA) with an excess of ethylene oxide or propylene oxide in DMF and in the presence of triethylamine as a catalyst yield polyetherols containing s ‐triazine rings. Their structure can be described by with R = H, CH 3 , and …”

Section: Introductionmentioning

confidence: 99%

“…1 The kinetics and mechanism of the addition of TTCA to ethylene oxide and propylene oxide were also described. 2 This article deals with the addition of the same TTCA to epichlorohydrin (ECH), which is, in practice, an oxirane of a great importance. As an asymmetric compound (like propylene oxide), ECH produces two isometric products: the normal and the abnormal one 3, 4 of the respective moieties: …”

Section: Introductionmentioning

confidence: 99%