Citation: Xu-feng Niu, Feng Tian, Li-zhen Wang, Xiao-ming Li, Gang Zhou, Yu-bo Fan. Synthesis and Characterization of Chitosan-graft-Poly(lactic acid) Copolymer[J]. Chinese Journal of Polymer Science, ;2014, 32(1): 43-50. doi: 10.1007/s10118-014-1369-1
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Chitosan-graft-poly(lactic acid) (CS-g-PLA) copolymer was synthesized through emulsion self-assembly in a water-in-oil (W/O) microemulsion. The water phase was composed of CS aqueous solution, while the oil phase was made up of PLA in chloroform. The W/O microemulsion was fabricated in the presence of surfactant span-80 and the self-assembly was performed between PLA and CS under the effect of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDCHCl). FTIR and 1H-NMR analysis indicated PLA was grafted onto the backbone of CS via the reaction between the carboxyl groups in PLA and the amino groups in CS. 1H-NMR characterization further revealed the grafting content of PLA was 16%. The obtained CS-g-PLA could self-assemble to form micelles, their size distributed in the range of 125-375 nm with average diameter of 142 nm. The present design integrates the favorable biological properties of CS and the excellent mechanical properties of PLA, which makes CS-g-PLA copolymer a promising candidate as a carrier for targeted bioactive molecules delivery.
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Keywords:
- Poly(lactic acid),
- Chitosan,
- Copolymer,
- Self-assembling,
- Grafting
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