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Preparation of high viscosity average molecular mass poly-L-lactide 被引量:2
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作者 周智华 阮建明 +2 位作者 邹俭鹏 周忠诚 申雄军 《Journal of Central South University of Technology》 EI 2006年第6期608-612,共5页
Poly-L-lactide(PLLA) was synthesized by ring-opening polymerization fi'om high purity L-lactide with tin octoate as initiator, and characterized by means of infi'ared, and ^1H-nuclear magnetic resonance. The influ... Poly-L-lactide(PLLA) was synthesized by ring-opening polymerization fi'om high purity L-lactide with tin octoate as initiator, and characterized by means of infi'ared, and ^1H-nuclear magnetic resonance. The influences of initiator concentration, polymerization temperature and polymerization time on the viscosity average molecular mass of PLLA were investigated. The effects of different purification methods on the concentration of initiator and viscosity average molecular mass were also studied. PLLA with a viscosity average molecular mass of about 50.5×1^04 was obtained when polymerization was conducted for 24 h at 140℃ with the molar ratio of monomer to purification initator being 12 000. After purification, the concentration of tin octoate decreases; however, the effect of different purification methods on the viscosity average molecular mass of PLLA is different, and the obtained PLLA is a typical amorphous polymeric material. The crystallinity of PLLA decreases with the increase of viscosity average molecular mass. 展开更多
关键词 POLY-L-LACTIDE POLYMERIZATION PURIFICATION high viscosity average molecular mass
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