The 1,3 configuration of double bonds found in 1,3-butadiene (conjugated double bonds) make these types of dienes capable of participating in more reaction types than is the case for molecules with either just a single alkenefunctional group or with multiple, but non-alternating, alkene groups. One possible reaction for such dienes is the Diels-Alder reaction.
A compound in which two double bonds exist but are immediate adjacent to each other is, in contrast, called an allene.
Usually when we talk of diene polymers, we're talking about polymers made from small molecules, or monomers, that have two carbon-carbon double bonds in what we call the 1 and 3 positions, that is, in the positions shown in the picture below.
Diene polymers are similar to vinyl polymers, but vinyl polymers are made from monomers with only one carbon-carbon double bond.
Because these diene polymers have double bonds in the backbone chains, they can be crosslinked by a process called vulcanization.
Cumulated dienes have the double bonds sharing a common atom as in a group of compounds called allenes.
The 1,3 configuration of double bonds found in 1,3-butadiene (conjugateddouble bonds) make these types of dienes capable of participating in more reaction types than is the case for molecules with either just a single alkenefunctional group or with multiple, but non-alternating, alkene groups.
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