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Abstract  

This article aims to modify conventional epoxy resin by blending with four different Mannich base oligomers. These oligomers are similar to phenolic resin matrix and simultaneously function as amino curing agent for epoxy matrix. In this context, Mannich base oligomers were prepared, respectively, by Mannich polycondensation reaction of four phenols namely phenol, m-cresol, resorcinol and 1,5-dihydroxy naphthalene, respectively, with formaldehyde and piperazine in presence of acid catalyst. The resulting oligomers were characterized by elemental analysis, spectral studies (IR and NMR), number average molecular mass

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estimated by non-aqueous conductometric titration and thermal stability by thermogravimetric analysis (TG). Each of these oligomers was used in resin matrix as a blending component for the modification of commercial epoxy resin for fabricating glass fibre reinforced laminates. Finally, these laminates were evaluated for their synergetic thermal stability, mechanical properties and chemical resistance to different reagents.

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Journal of Thermal Analysis and Calorimetry
Authors: Viorel Sasca, Elena Mosoarca, Livia Avram, Ramona Tudose, and Otilia Costisor

Abstract  

The thermal decomposition of Mannich base N,N′-tetra(4-antipyrylmethyl)-1,2-diaminoethane (TAMEN), and its Ni(II), binuclear complex, Ni2(TAMEN)Cl4, in air and in nitrogen atmosphere, were investigated. X-ray powder diffractometry, infrared spectroscopy and simultaneous thermogravimetry-differential thermal analysis (TG-DTA), have been used to characterize and to study the thermal behavior of these compounds. The results provided information concerning the stoichiometry, crystallinity, thermal stability and decomposition mechanism of the compound.

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Journal of Thermal Analysis and Calorimetry
Authors: Elena Mosoarca, Sasca Viorel, Livia Avram, Ramona Tudose, and Otilia Costisor

Abstract  

The thermal decomposition in air and in nitrogen atmosphere of binuclear complex compounds of Cu(II) and Co(II) containing the Mannich base N,N′-tetra(4-antipyrylmethyl)-1,2 diaminoethane (TAMEN) as a ligand, Cu2(TAMEN)Cl4 and Co2(TAMEN)Cl4, were investigated. X-ray powder diffractometry, infrared spectroscopy and simultaneous thermogravimetry-differential thermal analysis (TG-DTA), have been used to characterize and to study the thermal behavior of these compounds. The results provided information concerning the stoichiometry, crystallinity, thermal stability and decomposition mechanism of the compounds.

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Abstract

The new derivatives of 3,4-pyridinedicarboximide were synthesised. Experimental measurements were carried out using 1H NMR spectra, IR spectra, elemental analyses and differential scanning calorimetry. The purpose of this study was to study the thermal stability of these four new compounds and to establish a solid-state polymorphism. Measurements were carried out for samples obtained from ethanol and n-hexane and after a long-time storage.

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. Raj , MM , Raj , LM , Shah , TB , Patel , PM . Synthesis, characterization of Mannich base oligomers used with epoxy resin for glass fibre-reinforced laminates . J Therm Anal Calorim . 2010 ; 101 : 1003 – 1009 . 10.1007/s10973

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. Raj M , Raj L , Shah T , Patel P . Synthesis, characterization of Mannich base oligomers used with epoxy resin for glass fibre-reinforced laminates . J Therm Anal Calorim 2010 . doi: 10.1007/s10973

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