How is oxidation time measured in induction?
How is oxidation time measured in induction?
Oxidation-induction time can be known with the use of Differential Scanning Calorimetry measurements, which is done with the sample body and a substance that will be heated in a constant rate in an atmosphere of inert gas.
How can the oxidation induction time OIT specified in the DSC be used in industrial purposes?
Oxidative Induction Time (OIT) measured by Differential Scanning Calorimetry (DSC) on molten polymer samples is widely used in the plastics industry to assess the thermal stability of polyolefins. It is simple, it requires small samples and it is relatively fast.
What is OIT in polymer?
OIT is the abbreviation for oxidative induction time. It provides information about the oxidative stability of mainly polymer materials. This time can be used as criteria of the thermal stability of polyolefins in an oxidative atmosphere. The OIT method is standardized in ASTM® D 3895 and DIN EN 728 for polyolefins.
What is OIT in DSC?
The Oxidation Induction Times Test (OIT), as carried out in a differential scanning calorimeter (DSC), is used to predict thermo-oxidative performance of a material. OIT is a sensitive measure of the level of anti-oxidative additives within the polymer.
What is oxidation onset temperature?
5.1 Oxidation onset temperature is a relative measure of the degree of oxidative stability of the material evaluated at a given heating rate and oxidative environment, for example, oxygen; the higher the OOT value the more stable the material.
What is OIT in HDPE?
Oxidation Induction Time ( OIT ) The test is used to assess the level of stabilization of material by determining the time of oxidative decomposition. As a result, polyethylene resin manufacturers normally add stabilizers to improve the resistance of polyethylene to oxidative degeneration.
What is differential scanning calorimetry used for?
Differential scanning calorimetry can be used to measure a number of characteristic properties of a sample. Using this technique it is possible to observe fusion and crystallization events as well as glass transition temperatures Tg. DSC can also be used to study oxidation, as well as other chemical reactions.
What does OIT mean?
OIT
| Acronym | Definition |
|---|---|
| OIT | Office of Information Technology |
| OIT | Oregon Institute of Technology |
| OIT | Oral Immunotherapy (food allergy treatment) |
| OIT | Outsourced Information Technology |
Is 4984 a HDPE pipe?
– Manufactured from virgin pipe grade raw material (PE80/PE63 & PE100). – Manufactured as per IS-4984: 1995, standards in PE-63, PE-80 and PE-100 grades. – Up to 6 meter in straight lengths and up to 100 meters In coils.
What is the oxidation induction time of PE at 205°C?
During 17 minutes after gas change, DSC curve does not show any change due to the effect of antioxidizing agent; however, the exothermic peak appears due to the oxidization after 17 minutes. From this result, the oxidation induction time of PE at 205°C is measured as 17.2 minutes.
How does isothermal temperature affect oxidation time of PE?
The higher the isothermal temperature is, the shorter the oxidation induction time becomes. Higher temperature results in a higher rate of oxidization. Figure 3 shows the analysis of Cu influences on the oxidation induction time for PE.
Does Cu accelerate the oxidization reaction of PE?
Contrary to the 17 minutes of oxidation induction time of PE, it is 6 minutes in the case that Cu is contacted to PE. It shows that Cu accelerates the oxidization reaction of PE. PE is used as a wire coating material. The oxidation induction time enables the material evaluation considering the catalyst effect of Cu.
What is the oven stability of a polypropylene film?
F. Gugumus (1989) examined the oven stability of a polypropylene film for up to about 1.5 years between 40 and about 105°C, and the apparent activation energy in the Arrhenius plot was clearly variable with respect to temperature with a diminishing trend toward lower temperatures.
