Abstract
Poly(lactic acid) stereocomplex (PLA-sc) was prepared by blending poly-(L-lactic acid) (PLLA) with high molecular weight and poly(D-lactic acid) (PDLA) via solvent-mixing method. The formation and the crystallization behaviors of PLA-sc were investigated by differentical scanning calorimtery (DSC), polarizing optical microscope (POM) and X-ray diffraction (XRD). Furthermore, the influence of thermal history and nucleating agents on the PLA-sc crystallization behavior was discussed. Fully stereocomplexation of PLLA/PDLA blend can be achieved from the mass ratio of 5/5 and 6/4 for PLLA and PDLA. when the temperature is around 220℃, PLA-sc was preferentially formed either by the further crystallization or enhanced crystallization rate. Two different types of nucleating agents (Lak and talc) can effectively enhance the crystallization behavior of PLA-sc, prevent the formation of PLA homopolymer(PLLA and PDLA) and keep the high thermal stability of PLA-sc. The crystal morphology can be changed with the mass ratio of PLLA and PDLA. The presence of PLA-sc also changes the crystal morphology and crystallization behavior of PLA homopolymers.
| Original language | English |
|---|---|
| Pages (from-to) | 48-53 |
| Number of pages | 6 |
| Journal | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering |
| Volume | 30 |
| Issue number | 8 |
| State | Published - 1 Aug 2014 |
Keywords
- Crystal morphology
- Crystallization behavior
- Poly(lactic acid)
- Stereocomplex