What is the Aging Test ? （part 2）

 

Temperature Alternating Aging Test‍

Temperature is another important factor leading to the aging of polymer materials. For polymer adhesives, high temperature can accelerate the movement rate of the polymer adhesive chain, and low temperature can cause internal stress in the polymer adhesive. Alternation leads to chain scission of polymer adhesives and degradation and aging.

For rubber, high temperatures can accelerate the thermal movement of the molecular chain and Crosslink the rubber. Low temperature can cause the rubber molecular chain to freeze, making it brittle, decreasing its elasticity, and aging.

High and low temperature alternating aging test is an aging test method to evaluate the temperature resistance of polymer materials. It is usually carried out in a temperature alternating aging test chamber, from a certain temperature T1 (generally room temperature) to a certain temperature at a constant heating rate T2, maintain the temperature of T2 for a certain period of time, then reduce the temperature to a certain temperature T3 at a constant cooling rate, maintain the temperature of T3 for a certain period of time, and then increase to T1, which is a temperature cycle. The cycle length can be determined according to specific test requirements.


Damp Heat Aging Test

Damp heat aging test is an effective method to evaluate the aging resistance of polymer materials under high humidity and high temperature environment. In a high-humidity environment, water can penetrate into the polymer material, causing the polymer material to swell, and some of the hydrophilic groups are hydrolyzed, leading to aging and degradation of the polymer material.

In addition, the penetration of moisture into the polymer material can also cause the dissolution and migration of additives inside the polymer material, such as plasticizers, compounding agents, and other substances, and affect the mechanical properties of the polymer material.

Under the action of high heat, heat can promote the infiltration of water. Heat promotes the intensification of the movement of polymer chains, reduces the intermolecular force, promotes the infiltration of water, and accelerates the degradation of polymer materials.

Different polymer materials have different formulas, so their damp-heat aging mechanisms are also different. When the damp-heat aging test is carried out, different aging standards should be selected according to different polymer materials.

The damp heat aging test is usually carried out in the damp heat aging test chamber, and the temperature and humidity can be set according to the test requirements.


Medium Aging Test

Certain polymer materials need to be immersed in a certain medium for a long time during use. For example, polymer materials on equipment that have been engaged in marine operations or submarine operations for a long time must be immersed in seawater for a long time, and certain parts of aviation aircraft must be exposed to aviation for a long time. All these require that the high molecular materials have strong dielectric aging resistance.

The media aging test is a commonly used test method for evaluating the media aging resistance of polymer materials and predicting their life in a certain medium. The medium used in the aging test can be prepared according to the specific environment in which the polymer material is used. It can be artificial seawater, saltwater, rainwater, acid-base solutions, fuel oil, and other organic solvents.

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