z-logo
open-access-imgOpen Access
Transition metal catalyzed polymerization of butadiene in supercritical CO{sub 2}
Author(s) -
S. | Borkowsky,
William Tumas,
Robert M. Waymouth
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/631181
Subject(s) - supercritical fluid , polybutadiene , polymerization , catalysis , solvent , polymer chemistry , chemistry , copolymer , materials science , organic chemistry , chemical engineering , polymer , engineering
A class of Ni(II) catalysts has been shown to stereoselectively catalyze the 1,4-polymerization of butadiene. The authors have been investigating the use of supercritical CO{sub 2} as an environmentally benign replacement solvent for conventional hydrocarbon and halocarbon solvents for a variety of chemical transformations. Above 31 C, CO{sub 2} enters a supercritical phase, where its physical properties are both liquid-like and gas-like. Importantly, the solvent properties such as dielectric constant for supercritical fluids can be varied by changing the pressure of the fluid. In this report, the authors present results of an investigation of the polymerization of 1,3-butadiene using [({pi}-allyl) Ni(CF{sub 3}CO{sub 2})]{sub 2} in supercritical CO{sub 2}. They conducted 1,3-butadiene polymerizations in CO{sub 2} to determine whether or not they could systematically and predictably adjust the regiochemistry/stereochemistry of the polybutadiene product by varying the solution properties at different pressures. They also mention experiments with CO catalysts that are known to give 1,2-syndiotactic polybutadiene, and with a Pd catalyst system that is known to copolymerize olefin with CO to give perfectly alternating copolymers

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here