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Ethene‐butadiene copolymers by single‐site catalysts
Author(s) -
Kaminsky Walter,
Hinrichs Benjamin
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390143
Subject(s) - copolymer , vulcanization , catalysis , elastomer , glass transition , materials science , polymer chemistry , 1,3 butadiene , microstructure , natural rubber , chemistry , organic chemistry , polymer , composite material
Constrained geometry catalysts ([Me 2 Si(N t Bu)(Me 4 Cp)]TiCl 2 ) were used to copolymerize ethene and 1,3‐butadiene. It is possible to incorporate 17 mol% of butadiene, other catalyst systems such as CpTiCl 3 /MAO show much lower incorporation. More than 300 000 kg of copolymer can be obtained by one mol of the catalysts in one hour. The microstructure of the copolymers has been investigated by 1 H‐ and 13 C‐NMR spectroscopy. The butadiene is incorporated mainly in 1,4‐trans‐ and 1,2‐structure. The high amount of 9‐29% of vinyl groups offers the possibility of an easy vulcanisation. The molecular weights of these elastomers are high with values of 250 000. Important is the low glass transition temperature of −28 °C of a copolymer with 7 mol% of butadiene.