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Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

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You are here: Home Events Dr. Christophe Boisson "New Specialty Polyolefins Prepared with Neodymium Catalysts"

Dr. Christophe Boisson "New Specialty Polyolefins Prepared with Neodymium Catalysts"

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Chemistry, Catalysis, Polymers and Processes (C2P2), CPE Lyon, Villeurbanne, France

What
  • Seminar
When May 04, 2016
from 02:15 PM to 03:00 PM
Where Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg
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Polyolefins are the most important class of thermoplastics with a yearly production of ca. 120 million tons. New applications of polyolefins require higher level of properties that would make these materials more reactive, adhesive, dyeable or more generally compatible towards other materials. In the present communication, we report the unique feature of neodymium metallocene catalysts for catalyzing polyethylene chain growth on magnesium and towards the copolymerization of ethylene with butadiene.

In a first part of the presentation, the mechanism of catalyzed chain growth for the catalyst (C5Me5)2NdCl2Li(OEt2)2/MgR2 will be interpreted on the basis of a joint experimental/computational investigation.[1] The catalytic system was exploited for producing an array of end-functional polyethylene (PE)[2] and finally unique telechelic polyethylenes.[3]

In a second part, the preparation of semi-crystalline and amorphous ethylene/butadiene copolymers using a range of neodymium metallocene catalysts will be reported. Interestingly a new class of elastomers containing trans-1,4-butadiene units, 1,2-butadiene units and cyclohexane rings was obtained using the catalyst {Me2Si(C13H8)2Nd(μ-BH4)[(μ-BH4)Li(THF)]}2/(n-Bu)(n-Oct)Mg. These rings were formed by cyclocopolymerization of ethylene with butadiene.[4] The mechanism of polymerization was investigated at the DFT level.[5]

Selected references
[1] R. Ribeiro, R. Ruivo, H. Nsiri, S. Norsic, F. D’Agosto, L. Perrin, C. Boisson ACS Catal. 2016, 6, 851-860.
[2] (a) R. Briquel, J. Mazzolini, T. Le Bris, O. Boyron, F. Boisson, F. Delolme, F. D’Agosto, C. Boisson, R. Spitz Angew. Chem. Int. Ed. 2008, 47, 9311. (b) J. Mazzolini, E. Espinosa, F. D’Agosto, C. Boisson Polym. Chem. 2010, 1, 793-800.
[3] I. German, W. Khelifi, S. Norsic, C. Boisson, F. D’Agosto Angew. Chem. Int. Engl. Ed. 2013, 52, 3438-3441.
[4] J. Thuilliez, L. Ricard, F. Nief, F. Boisson, C. Boisson Macromolecules 2009, 42, 3774.
[5] H. Nsiri, I. Belaid, P. Larini, J. Thuilliez, C. Boisson, and L. Perrin ACS Catal. 2016, 6, 1028-1036.

invited by Pierre Lutz

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