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Citation: HE Zhu-Guo, LUO Bing-Hong, ZHOU Chang-Ren, CHENG Song, ZHANG Yi, ZHONG Cui-Hong. Microwave-assisted Synthesis and Characterization of Chitosan-graft-poly(D,L-lactide) Copolymers[J]. Chinese Journal of Applied Chemistry, ;2009, 26(10): 1134-1138. shu

Microwave-assisted Synthesis and Characterization of Chitosan-graft-poly(D,L-lactide) Copolymers

1.
Biomaterials Research Laboratory, Department of Materials Science and Engineering, College of Science and Engineering, MOE Engineering Research Center of Artificial Organs and Materials, Ji'nan University, Guangzhou 510632

Corresponding author: ZHOU Chang-Ren,
Received Date: 17 October 2008
Available Online: 28 December 2008
Fund Project: 国家自然科学基金(30500128) (30500128)国家高技术研究发展计划(“八六三”计划)(2007AA091603)资助项目 (“八六三”计划)(2007AA091603)

Chitosan-graft-poly(D,L-lactide)(CS-g-PLA) copolymers were obtained by means of microwave-irradiation and graft copolymerization via ring opening polymerization using stannous octoat(Sn(oct)₂) as catalyst without any organic solvent. Through orthogonality experiment the best synthesis conditions were optimized as follows:reaction power 10 W,reaction temperature 120 ℃,reaction time 15 min,the amount of catalyst n(lactide):n(Sn(oct)₂)=1 000:1. The products were characterized by FTIR,¹H NMR,XRD and DTG. These results show that microwave-assisted ring-opening polymerization can produce a CS-g-PLA copolymer successfully and rapidly. The average degree of polymerization of polylactide branch chains in the graft copolymer was 17.46. Compared with CS,the grafting destroyed the original crystallinity of chitosan,and the onset temperature of degradation and thermal stability of the products descended. The feed ratio n(D,L-LA)/n(aminoglucoside) had a strong influence on the structure and properties of the CS-g-PLA copolymer,and higher feed ratio led to the copolymer with a higher average degree of polymerization of polylactide branch chains,and a lower crystallinity and an onset temperature(246 ℃) of degradation,lower than that of CS of 253 ℃.
- microwave-assisted synthesis,
- chitosan,
- poly(D,L-lactide),
- graft copolymer
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