Authors:Liang Xue, Feng-Qi Zhao, Xiao-Ling Xing, Zhi-Ming Zhou, Kai Wang, Hong-Xu Gao, Jian-Hua Yi, Si-Yu Xu, and Rong-Zu Hu
, which shows that the thermalbehavior of 1,2,3-triazole nitrate can be divided into two stages. The first stage is a melting process. The second stage is an intense exothermic decomposition process. The characteristic temperatures of exothermic
Authors:Eveline De Robertis, Gabriela F. Moreira, Raigna A. Silva, and Carlos A. Achete
for thermalbehavior studies, since by the standard method for such determinations the major drawback is the time of analysis.
In this work, our intention is verify the thermalbehavior of two standard reference materials (SRM) using DSC, such
Authors:Eudes Lorençon, Rodrigo G. Lacerda, Luiz O. Ladeira, Rodrigo R. Resende, André S. Ferlauto, Ulf Schuchardt, and Rochel M. Lago
.e., 10 6 –10 8 . This result again suggests that Au does not have any catalytic effect on the carbon oxidation of SWNT.
This study presents the thermalbehavior of MWNT, SWNT, and CNP samples decorated with Au
Authors:D. Wyrzykowski, E. Hebanowska, G. Nowak-Wiczk, M. Makowski, and L. Chmurzyński
broader characteristics of its thermalbehaviour. To be able to do this, we have examined the intermediate dehydration products of the acid, trans -aconitic acid ( trans -propene-1,2,3-tricarboxylic acid) and its cis -isomer, cis -propene-1
Authors:A. Siqueira, C. de Carvalho, E. Rodrigues, E. Ionashiro, G. Bannach, and M. Ionashiro
Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium (III) (Tb–Lu, Y) and where L is pyruvate,
have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC),
X-Ray powder diffractometry, infrared spectroscopy, elemental analysis and complexometry were used to characterize and to
study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, thermal
behaviour, ligand denticity of the isolated complexes.
The thermal behaviours of magnesium sulfite, strontium sulfite and barium sulfite were investigated in the atmospheres of argon and air. the thermal behaviours of magnesium sulfite were different from those of the other two sulfites. The oxidation of magnesium sulfite in air does not occur.
Authors:Rodica Olar, Mihaela Badea, Veronica Lazar, Carmen Balotescu, Elena Cristurean, and Dana Marinescu
N,N-Dimethylbiguanide derivatives (HDMBG)X, where X=CH3COO
(1), Cl (2)
and NO3 (3) respectively,
exhibit in vitro antimicrobial activity
on representative bacterial and fungal strains. The presence of N,N-dimethylbiguanidium
ion for all derivatives was evidenced by IR and 1H
NMR spectra. Thermal analysis gave information on their decomposition steps
and also on the accompanying thermodynamic effects. According to TG and DTG
curves processes as melting, oxidative degradation as well as oxidative condensation
of –C=N– units occur. The different nature of the anions results
different melting points. Paracyanide formation at various condensation degrees
Curing of diglycidyl ether of bisphenol-A (DGEBA) with phosphorus containing amide amines i.e. bis[3(3’-aminobenzamido phenyl)]methyl
phosphine oxide (MB),bis[3(4’-aminobenzamido phenyl)]methyl phosphine oxide (PB), tris[3(3’-aminobenzamidophenyl)] phosphine
oxide (MT) and tris[3(4’-aminobenzamido phenyl)] phosphine oxide (PT)and conventionally used curing agent 4,4’-diaminodiphenyl
sulfone (D) was studied by DSC. The amines MB, PB, MT and PT were synthesised in the laboratory and were characterized by
determining elemental composition, melting point, and amine equivalent. Structural characterization was done by 1H-NMR and FTIR. The onset temperature of curing depended on the nucleophilicity of the amines and was in the orderMT≈MB<PT<PB<D.
The exothermic peak temperatures were in the orderD>PB>PT>MT≈MB. The char residue of cured epoxy resin was significantly higher
when phosphorus was incorporated in the cured network. Using mixed amine formulations based on amine D and P-containing amines
and the molar ratio of these amines could easily control the curing characteristics. A linear relationship between char yield
and P-content was observed in such formulations.
Authors:M. Rodríguez, P. Millán, R. Rojas, and O. Martínez
The basic salt cobalt(II) hydroxide fluoride was obtained by partial hydrolysis of a 0.2M solution CoF2. Mixed Co(II)Cu(II) hydroxide fluorides with an isomorphic substitution of Co(II) by Cu(II) ions up to 20% were also prepared.
XRD data obtained on these compounds indicate that they are single-phase compounds, their X-ray powder patterns being almost
identical to the Co(OH)0.7F1.3 diagram, with Zn(OH)F-type structure. However, their stoichiometries are very close to Co1−xCux(OH)F (0≤x≤0.2).
Thermal analysis studies carried out up to 1273 K in still air or under dynamic vacuum conditions show that in air CoO or
a mixture of CoO and CuO is formed as final product. In vacuum, at high temperature, with a Ta heating surface, pure α-Co
or a mixture of α-Co and Cu is formed at about 973 K.