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Heterogeneous catalytic ring opening polymerization of 2,2‐dimethyltrimethylene carbonate with metal alkoxides as initiators in protic conditions
Author(s) -
Colomb Erwan,
Novat Christian,
Hamaide Thierry
Publication year - 1999
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/(sici)1521-3935(19991101)200:11<2525::aid-macp2525>3.0.co;2-h
Subject(s) - polymerization , polymer chemistry , chemistry , monomer , lewis acids and bases , zinc , carbonate , catalysis , alcohol , metal , ring opening polymerization , ligand (biochemistry) , organic chemistry , polymer , biochemistry , receptor
The polymerization of 2,2‐dimethyltrimethylene carbonate (DTC) by using new heterogeneous systems as initiators has been investigated. These systems are obtained by grafting various Lewis acid metal alkoxides belonging to group IIb (Zn), IIIa (Al), IIIb (Y and Nd) as well as IVb (Ti and Zr) on porous solids (silica, alumina and zinc oxide). Adding alcohol in excess to the reaction mixture induces a transfer reaction which allows to synthesise functionalized polycarbonates. In most cases, the degree of polymerization is controlled by the [monomer]/[alcohol] ratio. It was found that the activity depends both on the metal and on the solid support. Y alkoxides offer the best activities while those belonging to group IVb are less efficient. The porous solid acts as a chemical ligand rather than only as a mechanical support of the active centres.