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Networks Based on Poly(α‐methylene‐δ‐valerolactone‐ co ‐δ‐valerolactone): Crosslinking Through Free‐Radical Vinyl Copolymerization
Author(s) -
Stöhr Olesja,
Ritter Helmut
Publication year - 2014
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.201300674
Subject(s) - copolymer , polymer chemistry , methylene , polyester , methacrylate , chemistry , methyl methacrylate , polymerization , radical polymerization , radical initiator , glass transition , materials science , polymer , organic chemistry
Unsaturated polyesters are synthesized via ring‐opening copolymerization of α‐methylene‐δ‐valerolactone and δ‐valerolactone. These polyesters 4a–c are mixed with ethyl methacrylate (EMA), 2‐hydroxyethyl methacrylate (HEMA), and α‐methylene‐δ‐valerolactone (α‐MVL), respectively. Then, crosslinking is carried out by free radical polymerization initiated by an azo‐initiator. A second glass transition is found with incorporation of HEMA and α‐MVL. These findings indicate the formation of phase‐separated polyester blocks crosslinked with the poly(meth)‐acrylic‐segments, respectively poly(α‐methylene‐δ‐valerolactone) segments.