Authors:Przemysław Rybiński, Grażyna Janowska, Małgorzata Jóźwiak, and Agnieszka Pająk
in steal molds placed between electrically heated press plates. The optimal time of vulcanization (τ 0.9) at a temperature of 160 °C was determined by means of a WG-2 vulcameter according to Standard PN-ISO 3417:1994.
The copolyamides consisting of ε-caprolactam and 6.1–24.5 wt.% of nylon salt prepared from adipic acid and 1-(2-aminoethyl)
piperazine were synthesized. Physical and thermal characteristics of polyamide 6 and the copolyamides were compared. Nylon
salt does not influence the polyreaction equilibrium so it is possible to prepare the copolyamides with high molecular weight
and with the content of low-molecular compounds comparable with that of pure PA 6. Melting temperatures of the copolyamides
are lower in comparison with PA 6 and decrease proportionally to the amount of the nylon salt. The thermal stability of the
copolyamides is good and equal to that of PA 6. The melting enthalpies indicate that the process of crystallization of the
copolyamides is influenced by the time of crystallization and the amount of comonomer present. Longer time of the crystallization
assures higher degree of crystallization. The kinetics and the level of crystallization are positively influenced by the mobility
of copolyamide segments mainly up to 10 wt.% of comonomer.
Authors:Kseniya V. Zherikova, Ludmila N. Zelenina, Natalia B. Morozova, and Tamara P. Chusova
temperatures, pressures etc.) that allow to obtain various metal, oxide, and composite layers. Besides for choice of deposition conditions the information about thermalproperties of used precursor is necessary first of all. For this purpose the series of
Authors:Vijayakumar Sarannya, Palanichamy Sivasamy, Nagarajan David Mathan, Thangamani Rajkumar, Durairaj Ponraju, and Chinnaswamy Thangavel Vijayakumar
important factor since its applicability can be assessed only on these grounds. In the present investigation, PEPA was synthesized and its structure was confirmed using FT-IR, 1 H and 13 C NMR spectral data. Its thermalproperties were studied using TGA
Poly(lactic acid)/organo-montmorillonite nanocomposites were prepared by melt intercalation technique. Maleic anhydride-grafted
ethylene propylene rubber (EPMgMA) was added into the PLA/OMMT in order to improve the compatibility and toughness of the
nanocomposites. The samples were prepared by single screw extrusion followed by compression molding. The effect of OMMT and
EPMgMA on the thermal properties of PLA was studied. The thermal properties of the PLA/OMMT nanocomposites have been investigated
by using differential scanning calorimeter (DSC) and thermo-gravimetry analyzer (TG). The melting temperature (Tm), glass transition temperature (Tg), crystallization temperature (Tc), degree of crystallinity (χc), and thermal stability of the PLA/OMMT nanocomposites have been studied. It was found that the thermal properties of PLA
were greatly influenced by the addition of OMMT and EPMgMA.
Authors:Suk -Fai Lau, A. J. Sosnowik, Ling -Siu Choi, J. H. Callahan, and Oh -Kil Kim
The thermal properties of a dye molecule (guest) inside the cavity of a host amylose helix were studied by TGA, DSC, and Thermal Desorption MS. The results show that the degradation temperature of dye shifts to a higher temperature by approximately 20°C.
Authors:M. Mostafa, N. Afify, A. Gaber, and E. Abu Zaid
This work aims in studying the temperature dependence of the thermal properties (thermal diffusivity, k, specific heat, Cp and thermal conductivity, ) of some basalt group samples, collected from different regions in the eastern desert of Egypt. The thermal properties of these samples were measured in the temperature range from r.t. to 900 K. The average values of the thermal conductivity of these investigated samples lie in the range from 0.4·10–3 to 2.01·10–3 cal cm–1 s–1 K–1. This means that these samples are considered as thermal insulating materials. The thermogravimetric analysis (TG) confirmed that these investigated samples are dry rocks. X-ray fluorescence (XRF) and X-ray diffraction (XRD) confirmed that these rock samples have a crystalline phase, the peaks of XRD have a small change in their location as a result of heat treatment. This behaviour was attributed to the oxidation and firing of some minerals after the heat treatment.
Hydrazine derivatives of the monobasic nitrilotriacetate salts of zinc and alkaline earth metals have been prepared. IR absorption
frequencies and thermal properties of these metal-hydrazinium nitrilotriacetates, (N2H5)M[N(CH2COO)3]·xH2O have been defined. All the three -COOH appear to be dissociated in these salts. In thermal decomposition, these salts initially
undergo dehydration followed by dehydrazination and via acetate intermediate step to metal oxycarbonates.
The dehydration and decomposition bauxite mixed with alkaline compounds were investigated under dynamic and isothermal conditions.
Alkaline compounds (CaO or/and Na2CO3) were added to bauxite samples in various mole fractions (0.0, 0.2, 0.4, 0.6, 0.8 and
1.0 of CaO). To determine the effect of alkaline additives on the thermal properties of bauxite, TG, DTG and DTA techniques
were used simultaneously under atmospheric conditions.