Thermal properties of amine hydrochlorides

Błażejowski, Jerzy; Kowalewska, Ewa

doi:10.1016/0040-6031(86)85244-3

Cited by 43 publications

(25 citation statements)

References 117 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It thus seems justifiable to assume that the primary step in decomposition of all the compounds studied is well approximated with the equation In several previous papers we have demonstrated that dynamic thermogravimetric data can be used to evaluate the enthalpy of reaction (2) on the basis of the Van't Hoff equation (Eq. (1)) [1][2][3]. Thus derived AHv values correspond, however, to the temperature range in which the volatilization process occurs.…”

Section: Resultsmentioning

confidence: 76%

“…Thus derived AHv values correspond, however, to the temperature range in which the volatilization process occurs. They were modified to ambient temperature by adding a heat capacity term (assumed arbitrarily to be -7 kJ.mo1-1 [1]). and terms resulting from phase transitions and melting [1][2][3].…”

Section: Resultsmentioning

confidence: 99%

“…They were modified to ambient temperature by adding a heat capacity term (assumed arbitrarily to be -7 kJ.mo1-1 [1]). and terms resulting from phase transitions and melting [1][2][3]. The appropriate humeri- Table 1 Thermal and thermochemical characteristics for ammonium and ethanaminium m cal values for both latter terms have been taken directly from literature [8] or were estimated by approximate procedures [1,9,10].…”

Section: Resultsmentioning

confidence: 99%

“…Such derivatives are, thus very convenient model systems for studying the influence of the structure of cations on the features of parent molecules. In our previous note we turned our attention to the thermochemistry and thermal properties of numerous chloride salts of nitrogen organic bases [1][2][3]. The present note is devoted to similar studies for ammonium and ethanaminium iodides.…”

mentioning

confidence: 98%

“…The values of temperature (T) corresponding to certain values of the extent of reaction (a) were derived in the manner previously described [1][2][3]. The enthalpies of dissociative volatilization (AHv) of the compounds studied were evaluated on the basis of the Van't Hoff equation:…”

mentioning

confidence: 99%

See 4 more Smart Citations

Thermal behaviour and thermochemistry of ethanaminium iodides

Dokurno

Łubkowski

Błażejowski

1990

Journal of Thermal Analysis

View full text Add to dashboard Cite

Dynamic thermoanalytical methods (DTA, TG, DTG) have been applied to the investigation of the thermal features of compounds of general formula (EtnNHa-n)I, with n = 0-4. The primary decomposition step of these derivatives is accompanied by the release of amine and HI to the gaseous phase. The enthalpies of this process have been evaluated on the basis of the van't Hoff equation and analytical TG curves. Values thus derived together with the available literature data were used to estimate the enthalpies of formation and the energies of the crystal lattice of the compounds. Further information regarding this latter quantity was also drawn from the Kapustinskii-Yatsimirskii formula.Owing to the rather strong base character of alkanamines they form salttype compounds with typical inorganic acids. The halogenide salts of such amines are one of the simplest ionic derivatives of organic compounds. Such derivatives are, thus very convenient model systems for studying the influence of the structure of cations on the features of parent molecules. In our previous note we turned our attention to the thermochemistry and thermal properties of numerous chloride salts of nitrogen organic bases [1][2][3]. The present note is devoted to similar studies for ammonium and ethanaminium iodides. Salts of alkanamines appear to have some industrial applications [4][5]. Nitrogen organic bases also commonly appear in biological systems. Thus, the present studies are of considerable scientific and practical importance.Experimental N, N, N-triethyl-ethanaminium iodide was purchased from Fluka AG and Bush SG. Other compounds studied were synthesized by mixing an aqueous solution of appropriate bases with an almost stoichiometric amount of hydroiodic acid. The resulting crystals were separated and purified by John Wiley & Sons, Limited, Chichester Akad~tiai Kiad6, Budapest

show abstract

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

See 3 more Smart Citations

Thermal behaviour and thermochemistry of ethanaminium iodides

Dokurno

Łubkowski

Błażejowski

1990

Journal of Thermal Analysis

View full text Add to dashboard Cite

show abstract

Thermogravimetric approach for determining the degree of conversion in radiation‐polymerized DADMAC

Francis

Varshney

Mitra

et al. 2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

The degree of conversion of the monomer diallyldimethylammonium chloride (DADMAC) to its polymer, poly(DADMAC), was determined using dynamic thermogravimetry (TG). DADMAC solution was exposed to different radiation doses, and the degree of conversion of the monomer to the polymer was determined from a calibration plot generated previously from solutions containing known monomer-polymer ratios. The concentration of monomer and polymer in the mixture was estimated by measuring the weight loss corresponding to the steps involved in the thermograms. By employing the method, polymerization of DADMAC as a function of irradiation dose was studied. The degree of conversion of DADMAC increases considerably during the initial stages of irradiation, up to a dose of 40 kGy, after which the increase in conversion is not very significant. To validate the method, the degree of conversion was also determined by classical gravimetry, and the results were found to be in good agreement.

show abstract

Activation energy of the thermal decomposition of ammonium metavanadate. A thermogravimetric study

Askar

Girgis

Khilla

1989

Journal of Thermal Analysis

View full text Add to dashboard Cite

The thermogravimetric curves of the title compound (AMV), recorded at two rates of heating (10 and 1.25 degmin-1), exhibited two separate steps of weight loss (at 423-513 and 513-613 K). The TG curves were analysed by testing 18 solid-state reaction equations associated with the methods of Coats and Redfern (1964), ~atava and gkvfira (1969) and Blazejowski et al. (1983). On the basis of linearization procedures, high-order reactions with n = 1.5 and 2.0 best described the two TG steps. The activation energies of the two conversion stages are: first stage: 163.6 and 152.6 kJ mol-~, and second stage: 238.1 and 167.7 kJ mol-1 (low and high heating rates, respectively).The overall reaction for the thermal decomposition of ammonium metavanadate (AMV) is generally represented as 2 NH4VO, 3 --}V2Os + 2 NH 3 + H20 accompanied by a total weight loss of 22.2% of the original sample weight. The decomposition does not take place in a single stage, but in several stages, and there is still little agreement as to the intermediates formed, the results depending on the method of detection and characterization.

show abstract

Thermal properties of amine hydrochlorides

Cited by 43 publications

References 117 publications

Thermal behaviour and thermochemistry of ethanaminium iodides

Thermal behaviour and thermochemistry of ethanaminium iodides

Thermogravimetric approach for determining the degree of conversion in radiation‐polymerized DADMAC

Activation energy of the thermal decomposition of ammonium metavanadate. A thermogravimetric study

Contact Info

Product

Resources

About