The dynamic viscoelastic behavior of Poly(l-lactic acid) (PLLA), with molecular weights ranging from 2,000 to 360,000, have been studied over a broad range of reduced frequencies (approximately 1 Ο« 10 Οͺ3 s Οͺ1 to 1 Ο« 10 3 s Οͺ1 ), using time-temperature superposition principle. Melts are shown to have
Effects of low molecular weight compounds with hydroxyl groups on properties of poly(L-lactic acid)
β Scribed by Yong He; Naoki Asakawa; Jianchun Li; Yoshio Inoue
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 249 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0021-8995
- DOI
- 10.1002/app.1892
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## Abstract The spherulitic morphology of pure poly(Lβlactide) (PLLA) was investigated with polarized optical microscopy as a function of the crystallization temperature and molecular weight. After being melted at 210Β°C for 3 min, samples were cooled quickly to designated temperatures for isotherma
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