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- Title
Synthesis and Characterization of Stereo Multiblock Poly(lactic acid)s with Different Block Lengths by Melt Polycondensation of Poly( L-lactic acid)/Poly( D-lactic acid) Blends.
- Authors
Rahaman, Md. Hafezur; Tsuji, Hideto
- Abstract
Stereo multiblock PLAs with different block lengths are synthesized by melt polycondensation of low-molecular-weight poly( L-lactic acid)/poly( D-lactic acid) blends with a wide variety of $\overline {M} _{{\rm w}} $ in the range of 1.1-5.2 × 103 g · mol-1. The average block length (νav) of the stereo multiblock PLAs increases with increasing $\overline {M} _{{\rm w}} $ of the blend and with the reaction temperature, whereas $\overline {M} _{{\rm w}} $ and PDI of the stereo multiblock PLAs increases with increasing $\overline {M} _{{\rm w}} $ of the blend, the reaction time, and the temperature. Stereo multiblock PLAs with νav > 7 are crystallizable to form stereocomplex crystallites, and the crystallinity and melting temperature of the stereo multiblock PLAs increases with increasing νav and $\overline {M} _{{\rm w}} $ of the stereo multiblock PLAs.
- Publication
Macromolecular Reaction Engineering, 2012, Vol 6, Issue 11, p446
- ISSN
1862-832X
- Publication type
Article
- DOI
10.1002/mren.201200032