Bi2Te3 nanoparticles (NPs) have been synthesized at 50 °C by a low-cost wet chemical route. The structural properties of product sample were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy. Thermal properties of product sample were investigated by differential scanning calorimetry (DSC), thermogravimetric (TG), and transient plane source techniques. The XRD and selected area electron diffraction of Bi2Te3 NPs result showed the polycrystalline nature with a rhombohedral (R3m) structure of the nanocrystallites. The average grain size of Bi2Te3 NPs was found to be about 30 nm by XRD and TEM measurements. DSC result shows one endothermic peak and one exothermic peak. TG result shows that only 48 % mass loss has occurred in Bi2Te3 sample. The obtained lower thermal conductivity of Bi2Te3 NPs is about 0.3 W m−1 K−1 at room temperature, which is caused by considering the crystalline nature of this material.
This article describes the test results of thermal properties and flammability of the unconventionally cross-linked blends
of chlorosulfonated polyethylene (CSM) and butadiene–styrene rubber (SBR) by means of zinc oxide or nano-zinc oxide. The thermal
curves have been interpreted from the point of view of the chemical transitions of elastomers and their blends. It has been
found that the content of combined chlorine in CSM exerts a significant influence on the cross-linking kinetics of CSM/SBR
blends, their thermal properties and flammability.
Authors:Dong-Ho Rie, Sung-Woong Moon, and Kyung-Bum Lim
impossible [ 4 ].
Accordingly, the present research has performed basic research on a recycling possibility of building’s interior materials by analyzing combustion and thermalproperties according to flame retardant treatment of paper honeycomb and
Authors:G. Janowska, A. Kucharska-Jastrzabek, A. Kasiczak, and W. M. Rzymski
type and quantity of metal compound used for cross-linking [ 3 – 5 ].
Currently produced and commercially available CSMs are characterized by different cross-linking capabilities, thermalproperties, and flammability [ 6 , 7 ], which is
Authors:G. Janowska, A. Kucharska-Jastrzabek, W. M. Rzymski, and A. Pajak
with MgO. These phenomena are connected both with the total Cl-content in the system and the specific action of MgO incorporated into the blends studied. The obtained results are the different thermalproperties and the combustibility of CSM of
Authors:J. Ahmed, J. Zhang, Z. Song, and S. Varshney
A thermal analysis of a series of polylactides (PLA) was carried out based on the number of average molecular mass (Mn), and the nature of isomer (D, L and DL). It is confirmed that the glass transition temperature (Tg) of PLA increased as a function of molecular mass irrespective of isomer type except sample with a high polydispersity index.
The melting temperature (Tm) and enthalpy of crystal fusion (ΔHf) of L-isomer increased as the Mn was increased from 1100 to 27500. The degree of crystallinity (χc%) increased as a function of molecular mass. However no crystallization peak was detected in the lower molecular mass range
(550–1400). The non-isothermal crystallization behavior of the PLA melt was significantly influenced by the cooling rate.
Both D and L isomers exhibited insignificant difference in thermal properties and DL lactides exhibited amorphous behavior at identical molecular masses. Change in microstructure showed significant difference
between two isomers. Analysis of the FTIR spectra of these PLA samples in the range of 1200–1230 cm−1 supported DSC observation on crystallinity.
Authors:A. V. Nikolaev, A. A. Opalovsky, V. E. Fedorov, and T. D. Fedotova
Data are presented on the properties of alkali metal and alkaline earth hydrofluorides. Melting, thermal decomposition and interaction of hydrofluorides with various classes of inorganic substances are discussed. Some regularities of changes in thermal properties within the sequences of the above hydrofluorides are established. Future directions of research in this field are outlined.
Thermal properties of new biocomposites prepared from modified starch
matrix reinforced with natural vegetable fibres were studied. DSC and TG methods
were applied to study thermal behaviour of biocomposites. Biocomposites were
obtained in the laboratory twin-screw extruder. Two kinds of natural fibres
were used, i.e. flax and cellulose in the amount of 0–40 mass%. DSC
curves of biocomposites reveal glass transition temperature, attributed to
the amorphous nature of the plasticized starch matrix. In general, incorporating
natural fibres into modified starch matrix leads to an increase in glass transition
Thermal degradation of modified starch matrix and
cellulose reinforced biocomposites proceeds in three steps, whereas the degradation
process of flax reinforced biocomposites occurs in two steps. For unreinforced
matrix as well as for all biocomposites, regardless of type and amount of
reinforcement, the major mass loss is observed at the temperature above 300C.
The increase in thermal stability with introduction of natural fibre is observed
for both flax and cellulose reinforced biocomposites.