The aging quiz chiefly refers to the thermal oxygen aging test of rubber, fictile products, electrical insulation materials, and other materials ; or the breathing aging screen for electronic parts and credit card products .

Seven aging test methods :

At present, there are many aging screen methods for polymer materials, including climate aging test, ultraviolet aging screen, ozone aging test, hot tune aging test, high and humble temperature alternating aging screen, damp heat aging test, medium aging examination, salt spray aging examination, etc..

Climate Aging Test

The alleged climate aging test is a kind of research method that exposes the test samples of polymer materials to atmospheric environmental conditions, so as to obtain the aging jurisprudence of the material samples exposed to the atmospheric environment, analyze the properties of polymer materials, and predict their service animation .

There are two types of climate aging tests

  1. One of them is the natural exposure test, the polymer material test sample is exposed to the real atmospheric environment to obtain the aging behavior of the material in the real environment. The aging information obtained by this aging test method is the most accurate. The most effective method for the aging behavior of molecular materials, but this test method cycle time is too long, time-consuming, and laborious. People in Florida in the United States, Wanning, Mohe, and Wuhan in China have conducted air exposure tests for more than a year.
  2. The other is the artificial climate aging test. The artificial climate aging test refers to the aging test method in which people simulate the real atmospheric environmental conditions indoors or strengthen a certain environmental factor to obtain the aging behavior of materials in a short time. It is also called artificial simulated aging or artificially accelerated aging. Artificial climate aging is usually carried out in an artificial climate aging chamber. The commonly used artificial climate aging chambers mainly include xenon lamp climate aging chamber, fluorescent lamp climate aging test chamber, and carbon arc lamp climate aging test chamber. These types of climate aging test chambers simulate or strengthen natural environmental factors from the main climatic factors such as light, temperature, humidity, rain, or condensation to achieve material aging. In addition, the aging test materials should be carried out according to certain test standards.

UV Aging Test

Ultraviolet alight in sunlight, because its light department of energy is equivalent to the bail energy of polymer chemical bonds, can cause the break of the polymer compound chain, which is the main gene leading to the degradation of polymer materials .
The ultraviolet aging quiz refers to a test method in which the aging screen samples of polymer materials are placed in an ultraviolet light field and exposed to obtain the aging demeanor and laws of polymer materials .
by and large, the ultraviolet aging examination will specify the ultraviolet region and the radiation volume, such as 40W/m2, in the wavelength range of 300nm-400nm. The unaccented sources used in the UV aging test normally include xenon lamps, fluorescent lamps, tritium lamps, and deuterium lamps. Among them, xenon lamps can simulate the solar spectrum well, and fluorescent lamps can simulate the ultraviolet spectrum of sunlight well. The tritium lamp can provide strong energy, which is broadly used for accelerate age tests .
DGBELL UV aging test

Ozone Aging Test

ozone is an highly rare gas in the standard atmosphere, but it is highly destructive to polymer materials. ozone can have an irreversible chemical reaction with unsaturated bonds and reducing groups in the chemical structure of polymer materials, resulting in oxidative abasement of polymer materials, thus losing the use-value. particularly for rubber eraser materials containing double bonds, it exhibits highly strong destructive might .
ozone has solid bodily process. It can decompose more active nuclear oxygen and chemically react with the double bonds in the condom molecule, causing rubber age, crack, and become brittle .
The ozone aging test of polymer materials is normally carried out in an ozone aging examination chamber. The ozone is provided by an ozone generator and its concentration can be adjusted by mixing with air with a sociable. The assiduity of ozone is generally determined according to the environmental conditions in which the substantial is actually used .
In addition, the temperature, humidity, and other factors in the ozone aging chamber can besides be adjusted to achieve the purpose of the test, and obtain the ozone aging electric resistance of the substantial and the behavior and law of ozone aging .
Ozone aging test

Hot Air Aging Test

Heat is one of the chief factors that cause the senesce of polymer materials. Heat can accelerate the motion of polymer chains, cause polymer chains to break, generate active voice free radicals, and cause free extremist chain reactions to cause polymer abasement or exchange.

The hot air aging test is one of the main trial methods for evaluating polymer materials and studying the aging resistance of polymer materials. It is normally carried out in a constant temperature blast drying test chamber .
The temperature in the drying oven can be set according to the test requirements. The polymer materials are regularly sampled and tested when exposed to dryness to obtain the aging behavior and laws of the polymer materials, so as to modify the polymer materials in a target manner and improve their performance .
Hot air aging

Temperature Alternating Aging Test‍

temperature is another important factor leading to the ripening of polymer materials. For polymer adhesives, high temperature can accelerate the movement rate of the polymer adhesive chain, and low temperature can cause inner stress in the polymer adhesive. Alternation leads to range scission of polymer adhesives and abasement and ripening .
For arctic, high temperatures can accelerate the thermal movement of the molecular chain and Crosslink the rubberize. low temperature can cause the rubber eraser molecular chain to freeze, making it brittle, decreasing its elasticity, and aging .
senior high school and low temperature alternating aging test is an aging test method to evaluate the temperature underground of polymer materials. It is normally carried out in a temperature alternating aging test chamber, from a certain temperature T1 ( broadly board temperature ) to a certain temperature at a constant heat rate T2, maintain the temperature of T2 for a certain period of time, then reduce the temperature to a certain temperature T3 at a changeless cool rate, maintain the temperature of T3 for a certain period of clock time, and then increase to T1, which is a temperature bicycle. The cycle duration can be determined according to specific test requirements .
Temperature alternating aging

Damp Heat Aging Test

Damp heating system aging test is an effective method acting to evaluate the aging resistance of polymer materials under high humidity and high temperature environment. In a high-humidity environment, body of 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 substantial .
In summation, the penetration of moisture into the polymer material can besides cause the adjournment 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 estrus, heat can promote the percolation of water. Heat promotes the intensification of the bowel movement of polymer chains, reduces the intermolecular force, promotes the infiltration of water system, and accelerates the abasement of polymer materials .
different polymer materials have different formulas, so their damp-heat aging mechanisms are besides different. When the damp-heat aging test is carried out, different aging standards should be selected according to different polymer materials .
The muffle heating system aging test is normally carried out in the dampen heat aging test chamber, and the temperature and humidity can be set according to the test requirements .
Damp heat aging

Medium Aging Test

Certain polymer materials need to be immersed in a certain medium for a long time during consumption. For example, polymer materials on equipment that have been engaged in nautical operations or submarine operations for a long prison term must be immersed in seawater for a long time, and certain parts of aviation aircraft must be exposed to aviation for a farseeing time. All these require that the high molecular materials have solid insulator aging resistance .
The media aging test is a normally used test method acting for evaluating the media aging underground of polymer materials and predicting their life in a certain medium. The metier 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, seawater, rain, acid-base solutions, fuel petroleum, and other organic solvents.


References:
hypertext transfer protocol : //www.sciencedirect.com/science/article/abs/pii/S0950061819314503
hypertext transfer protocol : //www.sciencedirect.com/topics/earth-and-planetary-sciences/organic-carbon
hypertext transfer protocol : //www.sciencedirect.com/topics/engineering/aging-temperature

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