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Macromonomers as Well‐Defined Building Blocks in the Synthesis of Hybrid Octafunctional Star‐Shaped Poly(ethylene oxide)s
Author(s) -
Pozza Gladys M.E.,
Harris Hassan,
Barthel Markus J.,
Vitz Jürgen,
Schubert Ulrich S.,
Lutz Pierre J.
Publication year - 2012
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/macp.201200292
Subject(s) - hydrosilylation , ethylene oxide , polymer chemistry , molar mass , surface modification , polymer , ethylene , materials science , oxide , star (game theory) , end group , catalysis , chemistry , organic chemistry , copolymer , physics , astrophysics
The present work addresses the synthesis and the molecular and structural characterization of soluble macromolecular architectures based on functional poly(ethylene oxide) (PEO)s and octafunctional silsesquioxanes. The synthesis of a series of functional PEOs by deactivation, decorated with allyl groups at one chain‐end, was considered first. PEO star‐shaped polymers were prepared by coupling via hydrosilylation of ω‐allyl PEOs with octakis(hydridodimethylsiloxy)octasilsesquioxane (HMe 2 SiOSiO 1.5 ) 8 (Q 8 M 8 H ), in the presence of a “Speier” catalyst. The products were characterized by SEC, 1 H NMR spectroscopy, light scattering, and MALDI–TOF MS to determine the molar masses and degree of functionalization. The star‐shaped PEOs (Q 8 M 8 PEO ) could be isolated from the raw reaction product and characterized. A functionalization close to the theoretical value was obtained.