NDLI: Preparation of high viscosity average molecular mass poly-L-lactide

Content Provider	Springer Nature Link
Author	Zhou, Zhi hua Ruan, Jian ming Zou, Jian peng Zhou, Zhong cheng Shen, Xiong jun
Copyright Year	2006
Abstract	Poly-L-lactide(PLLA) was synthesized by ring-opening polymerization from high purity L-lactide with tin octoate as initiator, and characterized by means of infrared, and $^{1}$H-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 50.5×10$^{4}$ was obtained when polymerization was conducted for 24 h at 140 °C 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.
Starting Page	608
Ending Page	612
Page Count	5
File Format	PDF
ISSN	10059784
Journal	Journal of Central South University of Technology
Volume Number	13
Issue Number	6
Language	English
Publisher	Central South University of Technology
Publisher Date	2006-01-01
Publisher Place	Changsha
Access Restriction	Subscribed
Subject Keyword	poly-L-lactide polymerization purification high viscosity average molecular mass Metallic Materials Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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