Piperylene


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Piperylene

 

(or 1,3-pentadiene),

1CH22CH—3CH—4CH—5CH3

a colorless liquid, insoluble in water but soluble in most organic solvents. Piperylene exists in the cis- and trans- forms (boiling points, 44.07°C and 42.03°C; densities at 20°C, 0.691 and 0.676 g/cm3, respectively). It enters into all reactions characteristic of conjugated diene hydrocarbons.

Piperylene is found in petroleum cracking products; it is a by-product of isoprene synthesis (from isobutylene and formaldehyde) and can also be obtained by dehydrogenation of n-pentenes. It polymerizes and copolymerizes readily—for example, with isoprene and styrene.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Key statement: An elastomeric composition incorporating a hydrocarbon polymer modifier including piperylene, cyclic pentadiene and aromatic components, and having a softening point from 80[degrees]C to 160[degrees]C, z-average molecular weight greater than 10,000, and at least 1 mole percent aromatic hydrogen, based on the total moles of hydrogen in the modifier.
It has been suggested that the piperylene monomer is particularly prone to dimerization by addition to a cycloaliphatic monomer prior to polymerization (ref.
butadiene, 2,3-dimethylbutadiene and piperylene, but were no more successful.