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《Journal of Beijing University of Chemical Technology》 2004-01
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Preparation and degradation of polylactide and its copolymer

Ma Xiao-yan Shi Shu-Xian Xia Yu-zheng Jiao Shu-ke Li Xiao-yu (The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China)  
Poly(D,L-lactide)(PLA) and poly(D,L-lactide)-poly(ethylene glycol) (PEG,M n=2、000) were synthesized from D,L-lactide(LA) and PEG with stannous octoate as the catalyst in the presence of N 2 under the normal pressure. The effect of temperature of polymerization and catalyst content on the relative molecular weights of PLA, and the regularity of degradation at different media and for different molecular weights of polymers were discussed in detail. The polylactide and its copolymer were characterized by infrared spectroscopy(IR),nuclear magnetic resonance( 1H-NMR) and gel permeation chromatography(GPC). The media used for testing of degradation were distilled water, 0.01、mol/L HCl solution, pH=7.4 phosphate buffer solution and 0.01、mol/L NaOH solution. The results show that the M v of PLA which was polymerized in 5、h, at the lactide/PEG mole feed ratio of 5、000, at 160、℃ under the normal pressure is 6.3×104 and PLA is degraded more rapidly in NaOH solution. The lower relative molecular weight of PLA is degraded more rapidly in the same medium. Compared with PLA, degradation of the copolymer is more rapidly.
【Fund】: 北京化工大学青年教师基金项目 (QN0 114 )
【CateGory Index】: TQ317
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