Premium
Direct evidence of star structure from nuclear magnetic resonance spectroscopy
Author(s) -
Pitsikalis Marinos,
Hadjichristidis Nikos,
Di Silvestro Giuseppe,
Sozzani Piero
Publication year - 1995
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.1995.021960904
Subject(s) - chlorosilane , polybutadiene , polymer chemistry , star (game theory) , nuclear magnetic resonance spectroscopy , star polymer , spectroscopy , polymerization , molar mass distribution , polymer , characterization (materials science) , materials science , chemistry , silicon , physics , nanotechnology , organic chemistry , copolymer , astrophysics , quantum mechanics
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.