期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 111, 期 5, 页码 2308-2317出版社
WILEY
DOI: 10.1002/app.29254
关键词
poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV); poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHx); bacterial polyesters; polytetrahydrofuran (PTHF); poly(methyl methacrylate) (PMMA); block and graft copolymers
资金
- TUBIITAK [104M128]
- Zonguldak Karaelmas University Research Fund
A new and promising method for the diversification of microbial polyesters based on chemical modifications is introduced. Poly(3-hydroxy alkanoate)-g-(poly(tetra hydrofuran)-b-poly(methylmethacrylate)) (PHA-g-(PTHF-b-PMMA)) multigraft copolymers were synthesized by the combination of cationic and free radical polymerization. PHA-g-PTHF graft copolymer was obtained by the cationic polymerization of THF initiated by the carbonium cations generated from the chlorinated PHAs, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHx) in the presence of AgSbF6. Therefore, PHA-g-PTHF graft copolymers with hydroxyl ends were produced. In the presence of Ce+4 salt, these hydroxyl ends of the graft copolymer can initiate the redox polymerization of MMA to obtain PHA-g-(PTHF-b-PMMA) multi-graft copolymer. Polymers obtained were purified by fractional precipitation. In this manner, their gamma-values (volume ratio of nonsolvent to the solvent) were also determined. Their molecular weights were determined by GPC technique. The structures were elucidated using H-1-NMR and FTIR spectroscopy. Thermal analyses of the products were carried out using differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2308-2317, 2009
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