What are the reasons for the aging of Tinned Copper Braided Sleeve?

1. internal cause
①Molecular structure of Tinned Copper braided sleeve

Chemical structure (or chain link structure): The basic structure of Tinned Copper Braided Sleeve is like the unit isoprene of natural Tinned Copper Braided Sleeve, which has double bonds and active hydrogen atoms, so it is easy to participate in the reaction.

Molecular chain structure: The weak bonds of the macromolecular chain of the Tinned Copper Braided Sleeve, the more weak links, the easier it is to age.
Unsaturated carbon chain Tinned Copper Braided Sleeve is prone to aging, and the oxidation reaction ability of saturated carbon chain Tinned Copper Braided Sleeve is related to its chemical structure. For example, branched macromolecules are easier to oxidize than linear macromolecules. In terms of oxidation stability, the various substituent groups are arranged in the following order: CH ② Coating components and impurities of Tinned Copper Braided Sleeve: There are often variable price metals in Tinned Copper Braided Sleeve, such as Ca, Fe, Co, Ni, etc. If it exceeds 3ppm, the aging of Tinned Copper Braided Sleeve will be greatly accelerated.
2. external cause
Physical factors: thermoelectric, photomechanical, high-energy radiation, etc.
Chemical factors: Oxygen, ozone, water vapor, acid, alkali and salt in the air, etc.
Biological Factors: Microorganisms: Bacteria and Fungi
Insects: Termites and cockroaches can eat polymer materials.
Sea creatures: oysters, lime worms, seaweed, seaweed, etc.
In practice, the above-mentioned factors often play a role at the same time. The effects of these factors are different in different conditions of use and regions, so the aging of Tinned Copper Braided Sleeve is a complicated process.
Among them, the common, influential and destructive factors are: heat, oxygen, photo-oxygen, mechanical force, and ozone, which can be summed up as thermal-oxygen aging, photo-oxygen aging, ozone aging, and fatigue aging.