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Helical Microstructure of Polynorbornene
Author(s) -
Karafilidis Christos,
Angermund Klaus,
Gabor Barbara,
Rufińska Anna,
Mynott Richard J.,
Breitenbruch Georg,
Thiel Walter,
Fink Gerhard
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200604264
Subject(s) - norbornene , polymerization , metathesis , microstructure , polymer chemistry , chemistry , crystallography , materials science , polymer science , polymer , composite material
Why don't you melt? The zirconocene‐catalyzed polymerization of norbornene proceeds by σ‐bond metathesis to give 2‐ exo ,7′‐ syn linkages in the main chain and 2‐ exo ,2′‐ exo ‐linked mononorbornyl branches. The resulting helical structure is very compact (see picture, view along helical axis), which hinders conformational changes and explains the insolubility of the polynorbornene and why it cannot be melted.