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What is crosslinked polyethylene?

The generally accepted reaction scheme for peroxide initiated crosslinking of polyethylene looks relatively simple. However, a deeper look into this subject reveals a far more complex and fascinating area. The presence of vinyl groups in the LDPE material proved to have a significant effect on the gel formation and on the network densities reached. The vinyl groups were found to be rapidly consumed via a so-called polymerisation reaction. Deeper studies of the network revealed that 2/3 of the network points present constituted of partially to fully trapped entanglements which means that only 1/3 are of chemical nature. It is therefore important to characterise the network by different techniques.