Testing PEX plastics: Oxygen, moisture, heat and other environmental factors
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In addition to ultraviolet radiation and the action of microorganisms, there are other factors that cause degradation of polymers. Although most polymers are slowly reacts with oxygen, elevated temperatures and ultraviolet radiation can strongly accelerate the oxidation processes. Water has a relatively weak negative effect. Nevertheless, there are three different effects associated with the influence of water. This chemical effect, consisting in the hydrolysis of unstable relationships, the physical effects of breaching the links between the polymer and filler, which leads to the appearance of chalky stains, and photochemical effects.
Thermal energy plays an indirect role in the destructive processes, accelerating the hydrolysis reaction, oxidation and photochemical reactions caused by the influence of other factors.
Effects of the environment on polymers is also due to the influence of various other factors, such as ozone, air emissions, dirt, soot, smog, sulfur dioxide, and other industrial emissions.
Tags: heat, moisture, Oxygen, PEX plastics, Testing
