Browsing by Author "Fuku, Yoko"

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    Effect of the melt-mixing condition on the physical property of poly(L-lactic acid)/poly(D-lactic acid) blends
    (Journal of Applied Polymer Science, 2017) El-Khodary, Esraa; Fuku, Yoko; Yamamoto, Masaki; Yamane, Hideki
    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 8C 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. VC 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45489.