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2016 ; 37
(9
): 769-74
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Polyphosphazene Based Star-Branched and Dendritic Molecular Brushes
#MMPMID27027404
Henke H
; Posch S
; Brüggemann O
; Teasdale I
Macromol Rapid Commun
2016[May]; 37
(9
): 769-74
PMID27027404
show ga
A new synthetic procedure is described for the preparation of
poly(organo)phosphazenes with star-branched and star dendritic molecular brush
type structures, thus describing the first time it has been possible to prepare
controlled, highly branched architectures for this type of polymer. Furthermore,
as a result of the extremely high-arm density generated by the phosphazene repeat
unit, the second-generation structures represent quite unique architectures for
any type of polymer. Using two relativity straight forward iterative syntheses it
is possible to prepare globular highly branched polymers with up to 30 000
functional end groups, while keeping relatively narrow polydispersities
(1.2-1.6). Phosphine mediated polymerization of chlorophosphoranimine is first
used to prepare three-arm star polymers. Subsequent substitution with
diphenylphosphine moieties gives poly(organo)phosphazenes to function as
multifunctional macroinitiators for the growth of a second generation of
polyphosphazene arms. Macrosubstitution with Jeffamine oligomers gives a series
of large, water soluble branched macromolecules with high-arm density and
hydrodynamic diameters between 10 and 70 nm.