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- Title
Effect of the melt-mixing condition on the physical property of poly( l-lactic acid)/poly( d-lactic acid) blends.
- Authors
El‐Khodary, Esraa; Fukui, Yoko; Yamamoto, Masaki; Yamane, Hideki
- Abstract
ABSTRACT The effect of the mixing condition in a mill-type mixer on the thermal property and the crystal formation of the poly( l-lactide)/poly( d-lactide) blends is investigated. The blends melt-mixed at 200 and 210 °C under application of a high shear flow tend to show a single melting peak of the stereocomplex crystal (SC) in the differential scanning calorimetry first and second heating processes without indicating the trace of the melting of homo-chiral crystal. The mixing at an elevated temperature causes a serious thermal degradation. Further kneading of the blends at an elevated temperature higher than Tm of SC causes the transesterification between the same enatiomeric chains forming block copolymers of l- and d-chains. This block copolymer acts as a nucleating agent of SC and the compatibilizing agent between poly( l-lactide) and poly( d-lactide) and promotes the formation of SC. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45489.
- Subjects
POLYLACTIC acid; BLOCK copolymers; POLYMER blends; CRYSTALLIZATION; TRANSESTERIFICATION; THERMOPLASTICS
- Publication
Journal of Applied Polymer Science, 2017, Vol 134, Issue 44, pn/a
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.45489