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Poly(ethylene)‐ co ‐Poly(norborn‐2‐ene) Prepared by Group IV Bisamido and Half‐Sandwich Amido Complexes with Pendant Aminoborane Groups: Vinyl Insertion vs Ring‐Opening Metathesis Polymerization
Author(s) -
Xu Guangjuan,
Narayana Gurram Venkata,
Speiser Maria,
Wang Dongren,
Zou Yuanlin,
Buchmeiser Michael R.
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400032
Subject(s) - romp , polymer chemistry , metathesis , copolymer , tacticity , polymerization , ring opening metathesis polymerisation , ethylene , chemistry , ring opening polymerization , materials science , catalysis , polymer , organic chemistry
A series of Zr IV and Ti IV complexes containing the 6‐(2‐(diethylboryl)phenyl)pyridyl‐2‐yl motif are used in the methylalumoxane‐triggered copolymerization of ethylene (E) with norborn‐2‐ene (NBE). 13 C NMR analyses reveal that vinyl insertion polymerization (VIP)‐derived poly(E)‐ co ‐poly(NBE) is obtained with pre‐catalysts 1–4 and 6 , while pre‐catalyst 5 allows for the synthesis of a copolymer that contains both VIP‐ and ring‐opening metathesis polymerization (ROMP)‐derived structures. All the VIP‐derived poly(E)‐ co ‐poly(NBE) sequences show predominantly isolated NBE/alternating‐syndiotactic E‐NBE, as well as alternating‐isotactic E‐NBE sequences. The microstructure of the copolymers is correlated with the propensity of the pre‐catalysts to allow tandem ROMP‐VIP.