Authors:Houyin Zhao, Yan Cao, William Orndorff, Yu-Hsiang Cheng, and Wei-ping Pan
SA is scarcely used [ 9 ]. The above investigations partially or singularly focused on one aspect of biodiesel and to date, there is no systematic study on thermalbehaviors of biodiesel using thermal analysis techniques, especially the moisture
Authors:B. C. Stojceva Radovanovic and P. I. Premovic
The urea complex of copper was synthesized and its structure was established by Fourier transform infrared (FTIR), electron spin resonance (ESR) and atomic absorption spectroscopy and elemental analysis to be Cu(urea)4Cl2. The thermal behaviour of this complex has been studied by thermogravimetry and differential thermal analysis and FTIR and ESR. Thermal analysis shows that the decomposition of the complex occurs in four stages of weight loss of different intermediates followed by three endothermal effects. The complex is thermally stable up to 428 K. The ESR and FTIR behaviour of the Cu(II)-urea complex during thermolysis was studied between 428 and 633 K. The experimental results suggest that in this temperature range the complex decomposition occurred forming thermodynamically stable regions of Cu(II) which are ferromagnetically coupled.
Authors:I. Labádi, R. Tudose, I. Fejér, Z. Jóri, and O. Costisor
Parent and mixed ligand complexes of cobalt and copper with antipyrine derivatives of 1,2-ethanediamine or piperazine and
with 2-aminobenzothiazole (TAB) were synthesized and their thermal behaviour was investigated. The complexes contain N,N′-bis(4-antipyrylmethyl)-piperazine
(BAMP) or N,N′-tetra(4-antipyrylmethyl)-1,2-diaminoethane (TAMEN) or/and TAB as ligand, and Cl−, ClO4− or SCN−. The complexes decompose with the evolution of heat. The decomposition route depends on the presence of ClO4−. If the ClO4− is not coordinated, it oxidizes the TAB and BAMP or TAMEN and the decomposition is explosive.
This paper describes the thermal behaviour of blends of bisitaconimide (I) and bisnadimide (N) resins of similar structures. Bisitaconimides/bisnadimides based on 4,4'-diaminodiphenyl ether (E);2,2'-bis[4-(4-aminophenoxy)phenyl]propane (B); 1,3-bis(4-aminophenyl)benzene(R) and 1,4-bis(4-aminophenyl)benzene (H) were prepared and were designated as E-I/E-N; B-I/B-N; R-I/R-N and H-I/H-N respectively. Itaconimides had lower melting points and curing temperatures than that of corresponding nadimides. The blends
of bisitaconimides and bisnadimides were prepared in the ratios of1:3, 1:1, 3:1 by solution mixing (chloroform/acetone). A
decrease in the melting point and characteristic curing temperatures was observed in the blends.
Thermal stability of cured resin blends was only marginally affected by the blend composition.
Authors:C. Parnau, R. Olar, M. Badea, and A. Kriza
The complexes of the type SnCl4(HL)·EtOH
and SnCl2L2 (HL 1
: the Schiff base resulted in 1:1 condensation of isatin and aniline; HL 2
: the Schiff base resulted in 1:1 condensation of isatin and p-toluidine)
have been synthesized and characterized. The thermal analysis of the new ligands
and complexes has evidenced the thermal intervals of stability and also the
thermal effects that accompany them. The Schiff bases thermal transformations
consist in phase transitions, Carom–N bond cleavage
and thermolysis processes. The different nature of the complexes generates
their different thermal behaviour. The complexes lead in three steps to SnO2
and in all cases the Schiff bases degradation generates a pyrrolidone-coordinated
derivative. As for the SnCl4(HL)·EtOH complexes,
the SnCl4 formed during the last step is involved in
two competitive processes, one consists in their volatilisation while the
other one leads to SnO2. As result the SnO2
residue is smaller than the theoretically expected.
Authors:M. Stanescu, C. Popescu, A. Rus, and C. Guran
A number of dibenzobicyclo[2.2.2]octane derivatives have been studied due to the interest of such compounds as ligands for
coordination compounds with potential biological activity. Their thermal behaviour has been analyzed in order to find out
more information about their fragmentation. A connection between the bridge substituents and the fragmentation process has
Authors:I. Labádi, Zs. Czibulya, R. Tudose, and O. Costisor
Parent and mixed ligand complexes of cobalt(II) and copper(II) ions with N,N'-bis- (4-antipyrylmethyl)piperazine or N,N'-tetra(4-antipyryl-methyl)-1,2-diaminoethane
or/and imidazole as ligand and ClO4- or SCN- as counterion were synthesised and their thermal behaviour was investigated.
Authors:Marcelo Kobelnik, Douglas Lopes Cassimiro, Diógenes dos Santos Dias, Clóvis Augusto Ribeiro, and Marisa Spirandeli Crespi
kinetic study. The TG/DTG curves with mass samples of 5 mg were not shown because they possess the same features of thermalbehavior.
TG/DTG curves of jerivá oil with sample mass 20 mg mass in nitrogen
Authors:L. A. Perez-Maqueda, C. Maqueda, J. L. Perez-Rodriguez, J. Subrt, Z. Cerny, and V. Balek
temperature phases [ 18 – 25 ]. Thermalbehaviour of vermiculite samples ground by vibratory mill has been characterized using thermal methods [ 26 ]. The comparison of the results obtained by different methods contributed to better understanding of the
Authors:A. Siqueira, C. Carvalho, E. Ionashiro, G. Bannach, E. Rodrigues, and M. Ionashiro
Solid-state Ln(L)3 compounds, where Ln stands for trivalent Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y and L is 2-methoxybenzoate have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential
scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy and complexometry were used to characterize
and to study the thermal behaviour of these compounds. The results provided information on the composition, dehydration, coordination
mode, structure, thermal behaviour and thermal decomposition.