scholarly journals An Overview of Thermal Analysis of Polymers

2017 ◽  
Vol 3 (1) ◽  
pp. 36-54
Author(s):  
DR Hardy Chan Sze On
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Kinetic Parameters ◽  
Physical Meaning ◽  
Thermomechanical Analysis ◽  
Special Focus ◽  
Modes Of Operation ◽  
Polymer Reaction

This article presents an up-to-date overview of the application of thermoanalytical methods in the study of polymers with special focus on thermogravimetry, differential thermal analysis, diferential scening calorimetry and thermomechanical analysis. The working principles behind the variouse thermoanalytical methods together with modes of operation are described. Their usefulness in the characterisation of polymers is cowered comprehensively with examples cited in the litearture. The question of validity of data obtained from thermokinetic studies of polymers is examined and it is felt that the kinetic parameters generated carry little physical meaning about the kinetic of the polymer reaction.

Kinetics of temperature-programmed reactivation of a hydrodesulphurization catalyst

1983 ◽  
Vol 48 (12) ◽  
pp. 3340-3355 ◽  
Author(s):  
Pavel Fott ◽  
Pavel Šebesta
Keyword(s):  
Carbon Dioxide ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thin Layer ◽  
Kinetic Parameters ◽  
Diffusion Region ◽  
Reaction Heat ◽  
Gaseous Products ◽  
Temperature Programmed ◽  
Kinetics Of

The kinetic parameters of reactivation of a carbonized hydrodesulphurization (HDS) catalyst by air were evaluated from combined thermogravimetric (TG) and differential thermal analysis (DTA) data. In addition, the gaseous products leaving a temperature-programmed reactor with a thin layer of catalyst were analyzed chromatographically. Two exothermic processes were found to take part in the reactivation, and their kinetics were described by 1st order equations. In the first process (180-400 °C), sulphur in Co and Mo sulphides is oxidized to sulphur dioxide; in the second process (300-540 °C), in which the essential portion of heat is produced, the deposited carbon is oxidized to give predominantly carbon dioxide. If the reaction heat is not removed efficiently enough, ignition of the catalyst takes place, which is associated with a transition to the diffusion region. The application of the obtained kinetic parameters to modelling a temperature-programmed reactivation is illustrated on the case of a single particle.

scholarly journals On the nature of crystallization water using thermal analysis. - The application to some hydrates with different cations

1999 ◽  
Vol 64 (12) ◽  
pp. 737-744
Author(s):  
Lucia Odochian ◽  
Magdelena Pantea ◽  
Irina Calugareanu ◽  
Dana Ionescu ◽  
Olga Vicol
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Kinetic Parameters ◽  
Compensation Effect ◽  
Crystallization Water ◽  
Water Elimination ◽  
Thermogravimetric Data ◽  
Dta Analysis ◽  
Derivative Thermogravimetry

The nature of the crystallization water in some hydrates with different cations, namely: MnSO4?H2O; FeSO4?7H2O; CoSO4?7H2O; NiSO4?7H2O, has been studied by the application of the following non-isothermal techniques: thermogravimetry (TG), derivative thermogravimetry (DTG), and differential thermal analysis (DTA). Analysis of the characteristic thermogravimetric data (Tm, W ) and of the kinetic parameters (n, Ea) calculated from DTG and DTA data - with CuSO4?5H2O as a reference - demonstrated the existence of crystallization and anionwater in the studiedhydrates. The activation energy of the process of anion water elimination does not depend on the nature of the cation. This conclusion was confirmed by the absence of the compensation effect in this process.

Thermal Degradation of Flame Retardant Cotton Cellulose

2010 ◽  
Vol 168-170 ◽  
pp. 380-383
Author(s):  
Ming Gao ◽  
Fa Chao Wu
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Kinetic Parameters ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Limiting Oxygen Index

Cellulose treated with flame retardant was studied by thermogravimetry (TG), differential thermal analysis (DTA), limiting oxygen index (LOI) and IR. The kinetic parameters for the thermal degradation are obtained following the method of Broido. For the flame retardant cellulose, the activation energy and decomposition temperature were much decreased while char yield and LOI were increased. The main thermal decomposition of the samples with higher LOI occurs at lower temperatures, while that with lower LOI occurs at higher temperatures.

Sign in / Sign up

Export Citation Format

Share Document