title: Chain walking: A new strategy to control polymer topology
abstract: Ethylene pressure has been used to control the competition between isomerization (chain walking) and monomer insertion processes for ethylene coordination polymerization catalyzed by a palladium-alpha-diimine catalyst. The topology of the polyethylene varies from linear with moderate branching to "hyperbranched" structures. Although the overall branching number and the distribution of short-chain branching change very slightly, the architecture or topology of the polyethylene changes from linear polyethylene with moderate branches at high ethylene pressures to a hyperbranched polyethylene at low pressures.
authors: DuPont Central Research, Experimental Station, Wilmington, DE 19880, USA.
authors: Z
authors: Guan
authors: PM
authors: Cotts
authors: EF
authors: McCord
authors: SJ
authors: McLain