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Polymerization of cyclic monomers, 3 . Synthesis, radical and cationic polymerization of bicyclic 2‐methylene‐1,3‐dioxepanes
Author(s) -
Moszner Norbert,
Völkel Thomas,
Rheinberger Volker,
Klemm Elisabeth
Publication year - 1997
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.1997.021980307
Subject(s) - cationic polymerization , polymerization , chemistry , methylene , photopolymer , monomer , polymer chemistry , radical polymerization , ring opening polymerization , polymer , organic chemistry
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.