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Peng Xiang and Zhibin Ye Alternating, gradient, block, and block–gradient copolymers of ethylene and norbornene by Pd–Diimine-Catalyzed “living” copolymerization Journal of Polymer Science Part A: Polymer Chemistry 51

Article first published online: 6 NOV 2012 | DOI: 10.1002/pola.26419

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A novel range of ethylene–norbornene copolymers having various composition distributions, including alternating, gradient, block, and block–gradient, have been synthesized by copolymerization with a “living” Pd–diimine catalyst. The tuning of the composition distribution is achieved conveniently by controlling norbornene feed concentration and/or using two- or three-stage polymerization with sequential norbornene feeding.

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