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About Differential Scanning Calorimeter(DSC) measuring oxidation induction period(part 1)

Nov 22, 2018

Briefly analyze the importance and significance of OIT(oxidation induction period):


Polymer materials are widely used in daily life, but they are often subjected to photothermal power and oxygen in storage processing and daily use, causing the physical and mechanical properties of materials to deteriorate, destroying the structure of materials, but under normal circumstances, the time for these changes It may be relatively long. To this end, accelerated aging experiments are commonly used to evaluate the stability of the polymer. The polymer first consumes the added antioxidant during the oxidation process. The antioxidant protects the polymer and rapidly oxidizes the material when the antioxidant is consumed. Therefore, OIT is a measure of the resistance of materials to oxidative decomposition. OIT using DSC to measure materials has become an important method for evaluating the thermal stability of polyolefin materials.


The oxidation induction period method is a simple and feasible test method for accelerated aging. Although it does not represent the factual results of the material in a complicated use environment, it can predict the thermo-oxidative stability of the material to a certain extent, thereby guiding the production of materials. Optimize the product.


Precautions for using the OIT test method:


1. OIT tested according to different standards is not comparable

2.OIT test is affected by factors such as measured material and processing history size and application conditions

3.different surface area to volume ratio of the sample, poor uniformity of the sample, residual stress and poor contact between the sample and the sample plate can adversely affect the accuracy of the test results.

4. accurate temperature control and the purity of the gas atmosphere can eliminate the influence of non-material factors on the results, which is very important for the measurement of oxidation induction period.

The oxidation induction period method is a simple and feasible test method for accelerated aging. Although it does not represent the factual results of the material in a complicated use environment, it can predict the thermo-oxidative stability of the material to a certain extent, thereby guiding the production of materials. Optimize the product.


OIT application:

Although the oxidation induction period is a test method for the plastics industry, it can be used in the CCL industry for rapid testing of the heat-resistant oxygen aging properties of CCL, providing a strong basis for formula screening and guiding research and development.

2 Polyolefin materials are commonly used for the protection and insulation of optical cables and cables, and the thermal oxidative stability of polyolefins used on optical cables and cables can be used to judge their lifetime, and the level of material stabilization can be evaluated by the oxidation induction period.


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