Abstract
In order to synthesize the higher molecular weight poly(lactic acids) by direct condensation polymerization of lactic acid, dipentaerythritol was used as a chain branching agent. Poly(lactic acids) of high molecular weight, 67000(Mn), was obtained by using antimony trioxide catalyst with good color. This poly(lactic acids) showed Tg of 54.8 °C, Tm of 147°C and cold crystallization temperature of 115°C. The polymer could be melt processed into transparent films. Tensile modulus of 311 Kg/ mm2, tensile strain of 21% and tensile strength of 12.41 Kg/ mm2 were obtained for film collected at 400%/min and drawn 4 times.
| Original language | English |
|---|---|
| Pages (from-to) | 277-287 |
| Number of pages | 11 |
| Journal | Macromolecular Symposia |
| Volume | 144 |
| DOIs | |
| Publication status | Published - 1999 |
| Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry