Thermal-oxidation of dioctyl adipate is performed in vitro at a temperature of 200 ° C. The experiment lasted 30 hours and it is interesting to note that interesting physical and chemical changes occurred in the DOA. The results of the experiment were evaluated using gas chromatography-mass spectrometry or GC-MS. The results of thermal oxidation were also simulated and evaluated by the molecular dynamics of the visual reaction force field or ReacFF MD. In the continuation of this article, join PETROPROVIDERS to acquaint you with how to perform Thermal-oxidation of dioctyl adipate and its results.

What is Dioctyl Adipate? What are its uses?

dioctyl adipate uses

dioctyl adipate uses

Dioctyl adipate, or DOA, is one of the most important esters in the world and is used as a solvent. It is obtained by the esterification reaction of adipic acid and 2-ethyl hexanol. This material has unique properties. for example:

  • Very high thermal resistance
  • High specific heat capacity
  • Very good thermal conductivity
  • Low production of ‘unwanted carbon’
  • Very good viscosity index
  • ..

This chemical is used in various industries. Due to its very convenient features, it can be used in the automotive industry. In addition, DOA can be used in the aerospace industry.

It is interesting to know that this material is also used to produce durable plastics. For example, GPPS and HIPS polystyrenes, which are involved in the production of durable plastics, can achieve better mechanical and chemical properties with DOA.

In addition, this material is also used as a PVC softener in the industry. This substance enters the reaction as a catalyst and increases the efficiency of various chemical reactions.

It should be noted that in industry, this substance is sometimes confused with DOP or dioctyl phthalate! Dioctyl phthalate is a popular type of phthalate composed of reactants such as phthalic anhydride.

In addition, it is also used in food packaging. In general, this material is also used to increase the strength of various packages. It is interesting to know that, unlike DOP, this substance does not pose many risks to human health and the environment.

In addition, this material is used as a raw material in various industries. It is interesting to know that the use of DOA increases the production efficiency of various products such as plastic products. The use of this substance mustn’t pose much risk to human health and the environment. You just have to follow the standards of production and use of this material.

Importance of performing Thermal-oxidation reaction of dioctyl adipate

Under these conditions, the DOA is to be placed in specific temperature conditions to see what changes in its structure occur. We know that in different industries, different types of equipment work at high speed. This equipment can lubricate the system in harsh temperature and high-temperature conditions. It is interesting to know that the higher the speed of the device, the more heat is generated.

DOA has good thermal and stability properties, but at very high temperatures and for a long time, it oxidizes and changes the performance of the system! We know that ester links in DOA are very special! For this reason, this material still retains its previous properties after oxidation.

In this regard, various reactions occur for DOA that if they are not investigated, it is not possible to detect how the dioctyl adipate changes. For this reason, reactions are performed to determine the mechanism of thermal-oxidation of dioctyl adipate to determine what changes occur in the structure of this substance.

In addition, there are methods for analyzing the thermal resistance of dioctyl adipate. These tests are:

  • Chemical light
  • Thermal analysis
  • Chromatography-mass spectrometry
  • Spectroscopy

In the thermal-oxidation reaction of dioctyl adipate, a conventional thermal analysis method is very useful; This is the Differential Pressure Scanning Calorimetry (PDSC) method. This interesting method has various applications for determining the thermal-oxidation of dioctyl adipate based on the oxidative induction time index (OIT) or the onset of oxidation temperature (OOT).

In various experiments and researches, the stability of thermal oxidation in a set of ester derivatives (based on oleic acid) was studied. In these experiments, it was concluded that the shorter the chemical structure of materials, the better their thermal oxidation stability.

It is interesting to note that despite the many advantages of this reaction, the chemical structures of thermal oxidation products cannot be detected using the PDSC reaction.

Most important methods for determining the thermal-oxidation of dioctyl adipate

Chemical luminescence analysis

Chemical luminescence analysis

Chemical luminescence analysis, or CL, is a method of analyzing chemical structures in which the contents of a substance are determined by the light of a chemical reaction.

In the Risho series of experiments, the activation energies and oxidation rate constants of three methyl esters were calculated using CL curves in the temperature range of 90 to 150 ° C. This study demonstrated that CL can be used to assess the degree of thermal-oxidation of dioctyl adipate, But this can not show its molecular structure and complete information.

Another method used to determine the thermal-oxidation of dioctyl adipate is the use of infrared spectroscopy. This technique is non-destructive and has a high speed. This technique can be used to analyze chemical changes in materials at high temperatures. In this regard, Hahn et al. Examined a range of pre-ester materials.

In these experiments, it was concluded that the products that are the result of oxidation have OH and COOH functional groups. Interestingly, the use of infrared spectroscopy can only record minor changes in some functional groups. This method, like CL and PDSC, can not fully determine the chemical properties of materials.

But the best technic to do these experiments was to use gas chromatography-mass spectrometry or GC-MS. In this method, different oxidation products can be separated and examined individually. Then their chemical structure can be identified and recorded.

In the experiments, about 11 products of thermal-oxidation of dioctyl adipate were obtained. These products were used to determine the mechanism of these oxidations. It is interesting to know that the various components of the products identified in these reactions play a role in determining the mechanism of these reactions.

It should be noted that this method has been replaced with a better method in recent years! The use of the GC-MS method is incomplete and a more complete method should be used to determine the exact information of the mechanism of the DOA oxidation reaction.

GC-MS instruments

GC-MS instruments

In this method, a more complete technique is used, in which the GC-MS method is also used. The reason for using the GC-MS method is to complete and increase the speed of reactions. In addition, it will increase the production efficiency of Iran dioctyl adipate.

Summary of Thermal-oxidation of dioctyl adipate and the latest method of determining its mechanism

In this article from PETROPROVIDERS, we saw different reactions to determine the mechanism of Thermal-oxidation of dioctyl adipate. It is interesting to note that the use of these methods in recent years, has faced some difficulty. The ReaxFF MD field is used after the molecular dynamics simulation method.

The use of this technique will increase the accuracy in studying the mechanisms and, in general, will increase the production efficiency of Iran Dioctyl Adipate. It is interesting to note that this method can simulate complex DOA oxidation systems. In addition, it can examine continuous processes.

In the next article from PETROPROVIDERS, we want to explain to you the interesting method of determining Thermal-oxidation of dioctyl adipate. In general, the default simulation with the GC-MS reaction is used to use the ReaxFF MD method. This technique can provide very accurate results from the thermal oxidation of dioctyl adipate.

What is your opinion about the Thermal-oxidation of dioctyl adipate? Is it necessary to use different methods to determine the mechanism of this reaction? What effect will determine the mechanism of this reaction have on the use of DOA? You can join us in the comments section and ask your questions from our experts. Contact us to buy the best DOA.


What is the best way to determine the Thermal-oxidation mechanism of dioctyl adipate?

Use the ReaxFF technique. MD, which also includes the GC − MS technique, can determine the most complete mechanism for the oxidation of dioctyl adipate.

Why does DOA oxidize?

In general, different chemicals oxidize at different temperatures. DOA will oxidize at temperatures above 200 ° C, despite very good structural properties.

What is the application of DOA in different industries?

This material is used to produce various types of insulation, flooring, refractory materials, durable plastics and is also used as a PVC softener.

What is Dioctyl Adipate?

It is one of the most important and widely used esters in the world! This material has very good temperature properties and is used for various reactions.