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Synthesis and characterization of poly[( R , S )‐3‐hydroxybutyrate] telechelics and their use in the synthesis of poly(methyl methacrylate)‐ b ‐ poly(3‐hydroxybutyrate) block copolymers
Author(s) -
Arslan Hülya,
Hazer Baki̇,
Kowalczuk Marek
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10435
Subject(s) - polymer chemistry , copolymer , polymerization , gel permeation chromatography , methyl methacrylate , anionic addition polymerization , telechelic polymer , diol , chemistry , polyol , succinic acid , materials science , end group , organic chemistry , polymer , polyurethane
Poly[( R,S )‐3‐hydroxybutyrate] oligomers containing dihyroxyl (PHB‐diol), dicarboxylic acid (PHB‐diacid) and hydroxyl‐carboxylic acid (a‐PHB) end functionalities were obtained by the anionic polymerization of β‐butyrolacton (β‐BL). Ring opening anionic polymerization of β‐BL was initiated by a complex of 18‐Crown‐6 with γ‐hydroxybutyric acid sodium salts (for PHB‐diol and a‐PHB) or succinic acid disodium salt (for PHB‐diacid). Dihydroxyl functionalization was formed by the termination of polymerization with bromo‐ethanol or bromo‐decanol while the others were done by protonation. Hydroxyl and/or carboxylic acid functionalized PHB oligomers with ceric salts were used to initiate the polymerization of methylmethacrylate (MMA). PHB‐ b ‐PMMA block copolymers obtained by this way were purified by fractional precipitation and characterized using 1 H‐NMR and 13 C‐NMR, gel permeation chromatography (GPC), and thermal analysis (DSC and TGA) techniques. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 965–973, 2002