Synthesis of novel biodegradable elastomers based on poly[3-hydroxy butyrate] and poly[3-hydroxy octanoate] via transamidation reaction
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Poly(3-hydroxyalkanoate)s (PHAs) are a class of polymers receiving attention because of their potential as renewable, biodegradable and high-technology properties. Unlike most short chain length (scl) PHAs such as poly(3-hydroxybutyrate) (PHB), medium chain length (mcl) PHAs such as poly(3-hydroxyoctanoate) (PHO) exhibit low crystallinity and are elastomeric in character. PHB-b–PEG-b–PHO block copolymers can combine both properties in block copolymer matrix. In this study, we report the synthesis of the block copolymers combining the PHB and PHO blocks. Transamidation reactions of PHB with polyethylene glycol with primary amine yield equimolar amounts and PHB with amine ends. PHO reacts with the modified PHB containing the amine end to give PHB-b–PEG-b–PHO block copolymers. Structural analysis of the products was performed by using 1H–, 13C, heteronuclear single quantum coherence NMR techniques. Thermal and mechanical properties of the block polymers were also evaluated.
KeywordsPoly(3-hydroxyalkanoate) Poly(3-hydroxy butyrate) Poly(3-hydroxy octanoate) Poly(ethylene glycol) Transamidation
This work was supported by the Bülent Ecevit University Research Funds (#BEU – 2013 – 72118496 - 02 and BEU - 2013 – 72118496 - 03). The authors thank to Prof. Dr. Mahmut Köse and Prof. Dr. İbrahim Demirtaş for their valuable discussion about the NMR spectra.
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