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Polymerization of 2,2′‐dimethyltrimethylene carbonate by lutetium complexes bearing amino‐phosphine ligands
Author(s) -
Liu Bo,
Cui Dongmei
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29534
Subject(s) - oligomer , lutetium , polymer chemistry , polymerization , monomer , chemistry , alkoxide , phosphine , ligand (biochemistry) , ring opening polymerization , alkyl , amide , molar mass distribution , catalysis , polymer , organic chemistry , yttrium , biochemistry , receptor , oxide
Abstract A series of lutetium alkyl, amino, and guanidinato complexes based upon an amino‐phosphine ligand framework had been prepared. These complexes were applied to initiate ring‐opening polymerization of 2,2′‐dimethyltrimethylene carbonate (DTC). The type of the initiator significantly influenced the catalytic activity of these complexes in a trend as follows: alkyl ≈ guanidinate > amide, whereas the complexes with flexible backbone between P and N atoms within the ligand exhibited higher activity than those with rigid backbone. The isolated PDTC had bimodal‐mode molecular weight distribution. The molecular weights of each fraction increased linearly with the conversion, indicating that there might be two active species. This had been confirmed by analyses of oligomeric DTC living species and oligomer with NMR technique as the metal‐alkoxide and the four‐membered metallocyclic lactate. Kinetic investigation displayed that the polymerization rate was the first order with the monomer concentration. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009