5 years ago

Effect of the melt-mixing condition on the physical property of poly(l-lactic acid)/poly(d-lactic acid) blends

Effect of the melt-mixing condition on the physical property of poly(l-lactic acid)/poly(d-lactic acid) blends
Masaki Yamamoto, Hideki Yamane, Yoko Fukui, Esraa El-Khodary
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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45489

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