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On the difference of reactivities of various aggregated forms of aluminium triisopropoxide in initiating ring-opening polymerizations

✍ Scribed by Andrzej Duda; Stanislaw Penczek

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
487 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The polymerization of ε‐caprolactone (εCL) initiated with aluminium triisopropoxide (Al(O^i^Pr)~3~) trimer (A~3~) and/or tetramer (A~4~) was studied. The rate of A~3~ ⇔︁ A~4~ interconversions in the diluted (≤0,1 mol · L^‐1^) C~6~D~6~, C~6~D~6~/εCL, and THF/εCL solutions were found to be slow, when compared with the rate of propagation. Comparison of the ^1^H NMR spectra of the initiators with those of the polymerization mixtures revealed that A~3~ is much more reactive than A~4~ in their reactions with εCL. From the initiator reacted with εCL all threeO^i^Pr groups from Al(O^i^Pr)~3~ are transferred into the poly(εCL) as end groups. Kinetic studies of polymerization confirmed the large reactivity difference between A~3~ and A~4~.

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