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Ethylene/10‐Undecenoic Acid Copolymers Prepared with Different Metallocene Catalysts

María L. Cerrada, Rosario Benavente, Ernesto Pérez, Jorge Moniz‐Santos, João M. Campos, M. Rosário Ribeiro

Open publisher page 14 citations

Abstract

Abstract The synthesis and characterisation of several functionalised polyethylenes, obtained by direct copolymerisation of ethylene with 10‐undecenoic acid (UA), have been carried out. Two metallocene complexes of Cs symmetry with different bridges were used: a dimethylsilyl bridge complex Me2Si(Cp)(Flu)ZrCl2 and a phenylidene bridge complex Ph2C(Cp)(Flu)ZrCl2. For comparison, results obtained with the Cp2ZrCl2/MAO system are also reported. The copolymerisation activity depends strongly on the metallocene complex and on the added amount of the UA comonomer. High incorporation levels of up to 7.3 mol‐% are achieved when using the phenylidene bridged catalyst presenting a rigid structure and a wide bite angle. The effect of comonomer content and catalyst geometry on the crystalline structure and mechanical behaviour of the different copolymers are comprehensively discussed. magnified image

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Abstract The synthesis and characterisation of several functionalised polyethylenes, obtained by direct copolymerisation of ethylene with 10‐undecenoic acid (UA), have been carried out. Two metallocene complexes of Cs symmetry with different bridges were used: a dimethylsilyl bridge complex Me2Si(Cp)(Flu)ZrCl2 and a phenylidene bridge complex Ph2C(Cp)(Flu)ZrCl2. For comparison, results obtained with the Cp2ZrCl2/MAO system are also reported. The copolymerisation activity depends strongly on the metallocene complex and on the added amount of the UA comonomer. High incorporation levels of up to 7.3 mol‐% are achieved when using the phenylidene bridged catalyst presenting a rigid structure and a wide bite angle. The effect of comonomer content and catalyst geometry on the crystalline structure and mechanical behaviour of the different copolymers are comprehensively discussed. magnified image

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Available abstract

Abstract The synthesis and characterisation of several functionalised polyethylenes, obtained by direct copolymerisation of ethylene with 10‐undecenoic acid (UA), have been carried out. Two metallocene complexes of Cs symmetry with different bridges were used: a dimethylsilyl bridge complex Me2Si(Cp)(Flu)ZrCl2 and a phenylidene bridge complex Ph2C(Cp)(Flu)ZrCl2. For comparison, results obtained with the Cp2ZrCl2/MAO system are also reported. The copolymerisation activity depends strongly on the metallocene complex and on the added amount of the UA comonomer. High incorporation levels of up to 7.3 mol‐% are achieved when using the phenylidene bridged catalyst presenting a rigid structure and a wide bite angle. The effect of comonomer content and catalyst geometry on the crystalline structure and mechanical behaviour of the different copolymers are comprehensively discussed. magnified image

Key concepts: Comonomer, Metallocene, Copolymer, Polymer chemistry, Ethylene, Post-metallocene catalyst, Catalysis, Materials science

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