Abstract
Microspheres with thermo-responsible surface were fabricated by PCL-b-PEO-b-PNIPAM triblock copolymers. Thermo-responsible morphological changes of PCL-b-PEO-b-PNIPAM microspheres immersed in aqueous solution at temperatures above the LCST (e.g. 37 °C) were observed from porous surface structure to compact surface layer. Enzymatic degradation and in vitro drug release results showed that the thermo-responsible surface layer greatly influenced the degradation of microspheres as well as the drug release behavior from microspheres. With the copolymerization of PNIPAM block into PCL-b-PEO copolymers, the drug release could be well regulated by changing temperatures and microspheres composition, which revealed the great potentials of microspheres with thermo-responsible surface for controlled drug release.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51025314 and 51390481).
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Yuan, Y., Sun, Pj., Shi, Xd. et al. Biodegradable microspheres with poly(N-isopropylacrylamide) Enriched surface: Thermo-responsibility, biodegradation and drug release. Chin J Polym Sci 33, 1598–1605 (2015). https://doi.org/10.1007/s10118-015-1702-3
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DOI: https://doi.org/10.1007/s10118-015-1702-3