Isothermal cold crystallization and melting behaviors of poly(L-lactic acid)s prepared by melt polycondensation
β Scribed by Linbo Wu; Hongbin Hou
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 324 KB
- Volume
- 115
- Category
- Article
- ISSN
- 0021-8995
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## Abstract Starting from D,Lβacid and SnCl~2~ as catalyst, poly(D,Lβlactic acid) (PDLLA) was directly synthesized by melt polycondensation. Under the appropriate conditions such as 0.5 wt % SnCl~2~, 170β180Β°C, 70 Pa, and 10 h, the viscosityβaverage molecular weight (__M__~Ξ·~) of PDLLA was 4100 Da.
Poly(L-lactic acid) (PLLA) was produced by the melt polycondensation of L-lactic acid. For the optimization of the reaction conditions, various catalyst systems were examined at different temperature and reaction times. It was discovered that Sn(II) catalysts activated by various proton acids can pr