Abstract
A novel reversible addition fragmentation transfer (RAFT) agent based on the poly-3-hydroxy butyrate (PHB) with three hydroxyl groups (PHB-R2) and thermoresponsive amphiphilic block copolymers derived from N-isopropyl acryl amide (NIPAM) are described. Hydroxylated PHB is obtained by the reaction between PHB and diethanol amine (DEA) to prepare hydroxylated PHB (PHB-DEA). It is then reacted with a RAFT agent, 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT). Hydroxyl ends of the hydroxylated PHB are capped with carboxylic acid end of the trithiocarbonate. The block copolymers obtained by the polymerization of NIPAM initiated by PHB-R2 were characterized by 1H NMR and physicochemical techniques. PHB content in the obtained block copolymers is varying between 14 and 45 wt%. The thermo-responsive PHB-PNIPAM block copolymers show the lower critical solution temperature (LCST) 28 and 30 °C while LCST of the pure PNIPAM is 32 °C.
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Acknowledgments
This work was supported by the Kapadokya University Research Funds (#KÜN.2018-BAGP-001) and Bülent Ecevit University Research Funds (#BEU-2017-72118496-01). The Authors thank to S. Hamadi (GPC) for technical assistance.
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Hazer, B., Eren, M., Senemoğlu, Y. et al. Novel poly(3-hydroxy butyrate) macro RAFT agent. Synthesis and characterization of thermoresponsive block copolymers. J Polym Res 27, 147 (2020). https://doi.org/10.1007/s10965-020-02133-1
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DOI: https://doi.org/10.1007/s10965-020-02133-1