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Direct evidence of star structure from nuclear magnetic resonance spectroscopy

✍ Scribed by Marinos Pitsikalis; Nikos Hadjichristidis; Giuseppe Di Silvestro; Piero Sozzani

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
314 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Until now the characterization of a star‐like structure has been based on an indirect method, i.e. the comparison of the molecular weight of the star polymer and its linear precursor. By preparing well‐defined and narrow‐molecular‐weight‐distribution polybutadiene and polyisoprene stars with up to four arms — using anionic polymerization techniques and the appropriate chlorosilane — and by characterising them by means of ^1^H and ^13^C NMR spectroscopy, the key point of the star, which is the core next to the silicon atom, was observed.

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