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Well defined polymer structures by ionic ring‐opening polymerization of cyclic monomers comprising the respective structure
Author(s) -
Keul Helmut,
Melchiors Martin,
Neffgen Stephan,
Gotsche Michael,
Höcker Hartwig
Publication year - 1996
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.19961070127
Subject(s) - polymer chemistry , cationic polymerization , copolymer , polymerization , monomer , ring opening polymerization , materials science , ethylene oxide , polymer , chemistry , composite material
Ring‐opening polymerization of cyclic monomers is the method of choice when tailor‐made polymers and copolymers with heteroatoms in the main chain are to be prepared. Triblock copolymers comprising a poly(ethylene oxide) block [poly(EO)] and two poly(2,2‐dimethyltrimethylene carbonate) blocks [poly(DTC)] were prepared using a telechelic poly(EO) as initiator for the DTC polymerization. These block copolymers dissolve suitable salts leading to solid polymeric electrolytes. The thermal properties and the ionic conductivity of these materials are presented. Block copolymers comprising a poly(tetrahydrofuran) block [poly(THF)] and a poly(trimethylene urethane) block [poly(TU)] were obtained by sequential cationic polymerization of THF and TU with methyl trifluoromethane‐sulfonate as initiator. Mechanistic and kinetic aspects of the TU polymerization are discussed. To achieve the synthesis of block copolymers with a poly(L‐lactide) block [poly(LLA)] and a poly(α‐amino acid) block [poly(AA)] amino‐terminated poly(LLA) was prepared which served as initiator for the polymerization of α‐amino acid N‐carboxyanhydrides.