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Polymerization of cyclic monomers, 3. Synthesis, radical and cationic polymerization of bicyclic 2-methylene-1,3-dioxepanes

✍ Scribed by Norbert Moszner; Thomas Völkel; Volker Rheinberger; Elisabeth Klemm

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
636 KB
Volume
198
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

New bicyclic 2‐methylene‐1,3‐dioxepanes, were synthesized starting from 2‐bromomethyl‐5,6‐dihydroxy‐1,3‐dioxepanes. The structure of the 2‐methylene‐1,3‐dioxepanes was confirmed by elemental analysis, IR, ^1^H NMR and ^13^C NMR spectroscopy. Radical polymerization of 2‐methylene‐1,3‐dioxepanes in bulk with 2,2′‐azoisobutyronitrile (AIBN) and di‐tert‐butyl peroxide (DtBPO), respectively, gives highly viscous polymers. The polymerization of liquid monomers is accompanied by negative volume changes. The spectroscopic investigations of the formed polymers show that 2‐methylene‐1,3‐dioxepanes undergo primarily radical ring‐opening polymerization, whereas the cationic photopolymerization is mainly a vinyl polymerization.

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