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In order to provide to rubbers - and in some cases to polyolefins - the
required mechanical, thermal and/or chemical performances, the materials
need to be crosslinked.
Depending the polymer and the application this operation can also be called
Curing (particularly for thermosets) or Vulcanisation (particularly
for rubber and involving sulfur).
Among the various crosslinking mechanism, free radical chemistry is the
most common one. The first step is always the generation of a free radicals.
Organic peroxides are acting as free radical source. Their thermal decomposition
generates very active peroxy free radicals capable to abstract Hydrogen atom from the
polymer backbone, particularly for polymer containing aliphatic CH2 units. The macroradicals
can then recombine to create branching and crosslinking.
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Organic peroxide can be used alone or combine with free radical multifunctional
monomers. In rubber, they are excellent alternative to traditional
vulcanisation
systems to provide Nitrosamine free solutions.
In this Crosslinking Agents Center, we propose you an general
description of the crosslinking mechanism, when the peroxide is used alone
or in combination with other monomers. We will also describe more on details the
families
of peroxides use for rubber crosslinking and the key
parameters.
Legislation in transportation and storage
will be also disclosed due to their specificity.
Some example of application for cable crosslinking and rubber crosslinking will be discussed and a recommendation
guide will help you in making the right choice for your application.
If you need fast and efficient assistance for your problems with organic
peroxide, you are welcome to use TechDirect, our free
technical assistance provided with the help of an expert in this field.
With TechDirect, you will rapidly get a solution to your problem.
The information contained in this document is based on trials carried
out by our Research Centres and data selected from the literature,
but shall in no event be held to constitute or imply any warranty,
undertaking, express or implied comitment from our part. Our formal
specifications define the limit of our commitment. No liability
whatsoever can be accepted by laws and/or regulations in force in
the country or countries concerned "Disclaimer".
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