Dioctyl Adipate Thermal-oxidation is performed under certain conditions; Information about this oxidation can be recorded and by-products and their properties can be examined. Using the GC-MS technique and ReaxFF MD simulation technique, information, and properties of dioctyl adipate can be recorded during the reaction. In the previous PETROPROVIDERS article, we talked about what reactions this substance can oxidize and what techniques are needed to measure and analyze information. In this paper, we are going to review the experimental results of the reaction. So stay with us until the end of this article.

Experimental observations on dioctyl adipate and its properties

DOA is used commercially as a solvent. This material can be considered as a PVC softener and increase the production efficiency of various plastic products. In the table below, you can see the interesting properties of dioctyl adipate and its oil:

Properties of DOA

Properties of DOA

We know that esters have special properties. These materials in combination with other materials can give them very good properties. In addition, it is interesting to know that the use of these materials is necessary to increase the production efficiency of products in reactions.

In industry, we use a well-known ester called DOA or dioctyl adipate. It has a complex reaction to produce, and each time it is produced, some extra carbon is produced as a by-product.

It should be noted that due to the very interesting properties of DOA, this material heats up to 500 degrees and does not melt! It is converted to pure carbon graphite and used in various industries.

Another very interesting feature of DOA is that it has very little toxicity. According to the FDA, you can use this material as food packaging, use it to make a variety of plastic products, and you can also use it as a PVC softener. In addition, it is used to produce durable plastic products such as HIPS polystyrene and GPPS polystyrene.

In addition, this material is also used in the automotive and aerospace industries. It is interesting to know that the use of this material to produce a variety of temperature-resistant materials is very popular. It can be said that the use of Iran Dioctyl Adipate, in addition to increasing the efficiency of reactions, also saves costs.

In industry, this substance is sometimes confused with DOP! DOP, or dioctyl phthalate, is a type of phthalate produced by the phthalic anhydride reaction. This substance is also used as a solvent, but it is not as widely used as DOA! DOA Market has also increased in recent years due to the extraordinary properties of this material.

Accelerated thermal oxidation test in a furnace for dioctyl adipate

A 200 ml glass beaker was selected for this experiment; Then 150 ml of DOA base oil was poured into it. The human was then placed at 200 ° C for 30 hours.

TAN and kinematic viscosity of DOA base oil before oxidation were determined based on ASTM D 974. Oxidized DOA was also determined based on ASTM D 445.

Perform tribological test to measure Dioctyl Adipate Thermal-oxidation

The tribological properties of this material were evaluated under special conditions using a specialized machine. In this situation:

  • The forced pressure was 147 Nm
  • The duration of the experiment was 30 minutes.
  • The rotation speed of the car was 1450 rpm
  • The temperature of the test medium was 25 ° C.

Also, the temperature of the column was increased from 80 ° C to 150 ° C (for 5 minutes) with an increase of 10 ° C/min. It was also performed from 150 ° C to 230 ° C (for 10 minutes), with an increase in temperature of 5 ° C/minute.

In this experiment, helium gas was used as the carrier gas; The gas was flowing at a rate of 1 ml per minute. All this data was then performed using a full scan according to NIST technology. It should be noted that Dioctyl Adipate Thermal-oxidation information was recorded using Materials Studio software.

In this experiment, the simulation temperature was set at 900 ° C. In addition, the experimental simulation time was 200 ps; It should be noted that the equilibrium time of this experiment was 10 seconds. In addition, a thermostat with a damping constant of 0.1 ps and the specified characteristics was used to control the temperature.

Test results are recorded and analyzed:

At this point, Dioctyl Adipate Thermal-oxidation is almost over! Because the conditions are simulated and different materials are made in this experiment. At this point, you should first see the following figure:

oxidized DOA

oxidized DOA

You can see what the oxidized DOA looks like at 200 ° C after 30 hours of heating. This figure shows that the peak of changes in the DOA structure was recorded at 29.73 minutes of the experiment. In addition, the chemical molecular structure of dioctyl adipate is present within this form.

Figure b also shows that the GC-MS results are recorded and show the TIC results for the DOA:

TIC results for the DOA

TIC results for the DOA

These results were recorded at 200 ° C after 30 h. We see that again the temperature peak occurred at 29.73 minutes and was recorded. You can also see other peaks in the diagram related to the thermal oxidation of polymer products and by-products.

In addition to these diagrams, you can see in the table below, the storage time of thermal-oxidation products as well as the molecular structure of each of them:

molecular structure of thermal-oxidation products

molecular structure of thermal-oxidation products

In this diagram, we see that at the peak of molecule 12, the molecular weight of 497 is also recorded. This peak is much higher than the initial DOA. Therefore, it can be concluded that this material is also a kind of thermal polymer product. However, due to its very complex structure, it cannot be identified and recorded using NIST information.

According to the diagrams and pictures, it can be seen that the polymer thermal products were usually carboxylic acids and diesters; But thermal by-products are usually low molecular weight monoesters, diesters, and carboxylic acids.

In this experiment, it was shown that tribological and physicochemical properties, which are two of the most important factors reflecting the properties of different materials, are directly related to TAN changes as well as viscosity. In addition, it has been recorded that after oxidation, TAN in dioctyl adipate increased from 0.046 to 3.089 mg/KOH.

Summary of the study of Dioctyl Adipate Thermal-oxidation

In these experiments, the results showed that after oxidation of DOA, the tribological properties of DOA also improved; Due to the formation of carboxylic acids, which were considered very polar. In addition, the total number of acids or TANs has increased; Due to the presence of carboxylic acids as well as low molecular weight monoesters.

Also, due to the formation of high molecular weight polymer products, the viscosity increased. In addition to polymer products, the production of low molecular weight by-products was also reduced.

In these experiments, the ReaxFF MD simulation technique, which recorded the results using GC-MS, confirmed and recorded the Dioctyl Adipate Thermal-oxidation mechanisms. These results led to the production of better quality Iran dioctyl adipate.

What do you think about Dioctyl Adipate Thermal-oxidation? Will this experiment end here and in this article from PETROPROVIDERS? Can the application of these reactions and these techniques be seen in everyday life? In your opinion, how effective can these research efforts be in increasing the production efficiency of various products?

In the comments section, you can ask your experts about Dioctyl Adipate Thermal-oxidation. In addition, you can contact us to buy the best Iran Dioctyl Adipate.


What are the most important uses of Dioctyl Adipate?

This substance is used as a solvent and emollient. In addition, it is used to produce a variety of plastic products. DOA is also used for the automotive and aerospace industries.

Does DOA oxidize under normal conditions?

No! This material is very resistant to heat and is used to produce a variety of resistant products. DOA is oxidized at 200 ° C for 30 h.

What is used to record the results of Dioctyl Adipate Thermal-oxidation?

To record these results, the GC-MS technique and ReaxFF MD simulation are used.

What is the difference between dioctyl adipate and dioctyl phthalate?

Dioctyl adipate, or DOA, is a type of ester; Dioctyl phthalate, on the other hand, is a type of phthalate produced from phthalic anhydride.