Thermogravimetric analysis controlled rate

Thermogravimetry (TG) or thermogravimetric analysis (TGA). In this technique, the mass of a sample is followed as a function of temperature or time. The amount and rate of mass change with temperature or time in a controlled atmosphere are obtained. Such information can tell us about thermal stability as well as the compositional profile of a variety of elastomers and polymers. It is an excellent quantitative technique but qualitatively there may be some doubt as to what material is lost during heating. 

Thermogravimetrical analysis (TGA) This technique is widely employed and it measures the amount and rate of change in the weight of a material as a function of temperature under a controlled atmosphere. The measurements are used primarily to evaluate the thermal stability. The technique can characterize materials that exhibit weight loss or gain dne to decomposition, oxidation, or dehydration. As an example, Zhang et al." evaluated the step thermal degradation and the thermal reliability of a silica/n-octadecane MPCM. 

Thermogravimetric analysis (TGA) of the blends was carried out using a Perkin Elmer Pyris 6 machine. Samples of the HDPE/NR/TPS blends were tested at a heating rate of 10 °C min from ambient temperature to 600 °C. Two types of samples were studied control and vulcanized HDPE/NR/TPS blends. 

A technique called evolved gas analysis is used to monitor the by-products of reactions associated with heat (Chapter 4). In this technique the sample is heated at a controlled rate under controlled conditions and the weight changes monitored by, for example, thermogravimetric analysis. 

In thermal analysis, physical parameters like mass, heat flow, heat capacity and enthalpy are measured as a function of temperature and time, while the sample is subjected to a controlled temperature programme (which in most cases is the application of linear heating rates or isothermal conditions).The two most common thermoanalytical techniques to investigate thermal and caloric properites of energy-rich compounds are Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). 

Thermogravimetric analysis is one of the thermal analysis techniques used to characterize a variety of polymers and provides complementary and supplementary characterization information to DSC technique. TGA measures the amount and rate (velocity) of change in the mass of a sample as a function of temperature or time in a controlled... 

Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) data were obtained by using a Perkin-Elmer DSC-7 differential scaiming calorimeter and a TGA-7 thermogravimetric analyzer interfaced with a TAC 7 thermal analysis controller and a PE-7700 data station. DSC and TGA samples were heated at a rate of 10 °C/min with purified Nj gas flow of 20 cmVmin. 

Thermogravimetric analysis measures the amount and rate of weight change in a material as a function of temperature, or time, in a controlled atmosphere. These measurements are mainly used to determine the composition of polymer products and precursors (e.g. additive master batches), but can also be used to measure thermal stability and study the effects that additives such as antidegradants have on this property. 

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