Synthesis, Characterization and Application of Thermoresponsive Polyhydroxyalkanoate-graft-Poly(N-isopropylacrylamide).

Abstract

A thermoresponsive graft copolymer polyhydroxyalkanoate-g-poly(N-isopropylacrylamide) or short as PHA-g-PNIPAm, was successfully synthesized via a three-step reaction. First, PNIPAm oligomer with a trithiocarbonate-based chain transfer agent (CTA), short as PNIPAm-CTA, with designed polymerization degree was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. Subsequently, the PNIPAm-CTA was treated with n-butylamine for aminolysis in order to obtain a pendant thiol group at the end of the chain (PNIPAm-SH). Finally, the PNIPAm-SH was grafted onto unsaturated P(3HDD-co-3H10U), a random copolymer of 3-hydroxydodecanoate (3HDD) and 3-hydroxy-10-undecylenate (3H10U), via a thiol-ene click reaction. Enhanced hydrophilicity and thermoresponsive property of the resulted PHA-g-PNIPAm were confirmed by water contact angle studies. The biocompatibility of PHA-g-PNIPAm was comparable to poly-3-hydroxybutyrate (PHB). The graft copolymer PHA-g-PNIPAm based on biopolyester PHA could be a promising material for biomedical applications.

DOI: 10.1021/acs.biomac.6b00724

Cite this paper

@article{Ma2016SynthesisCA, title={Synthesis, Characterization and Application of Thermoresponsive Polyhydroxyalkanoate-graft-Poly(N-isopropylacrylamide).}, author={Yi-ming Ma and Dai-Xu Wei and Hui Yao and Lin-Ping Wu and Guo Chen}, journal={Biomacromolecules}, year={2016}, volume={17 8}, pages={2680-90} }