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Macrocycles, 8. Multiblock copoly(ether‐esters) of poly(THF) and ϵ ‐caprolactone via macrocyclic polymerization
Author(s) -
Kricheldorf Hans R.,
Langanke Dennis
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(19990501)200:5<1183::aid-macp1183>3.0.co;2-k
Subject(s) - polymer chemistry , condensation polymer , tetrahydrofuran , ether , chemistry , polymerization , ring opening polymerization , caprolactone , dispersity , polymer , organic chemistry , solvent
Abstract It has been demonstrated that the “polycondensation” of poly(tetrahydrofuran)‐diols with dibutlytin dimethoxide in bulk yields tin‐containing poly(THF) macrocycles and not linear polycondensates. These macrocycles were characterized by 1 H and 119 Sn NMR spectroscopy, by elemental analyses, viscosity measurements and mass spectroscopy. Furthermore, the stoichiometric insertion of γ ‐thiobutyrolactones was studied. The tin‐containing macrocyclic poly(THF)‐2 000 was used as macrocyclic initiator for the polymerization of ε ‐caprolactone. The resulting macrocyclic block copoly(ether‐esters) were reacted in situ with terephthaloyl chloride, succinyl chloride, or sebacoyl chloride. High temperatures proved to be advantageous for this polycondensation step. Number‐average molecular weights ( M n 's) up to 50 000 were obtained with polydispersity indices in the range of 1.6–1.7. The resulting tin‐free multiblock copoly(ether‐ester)s have the properties of thermoplastic elastomers and show good film‐forming properties.