Enhancement of Poly(L-lactic acid)/Poly(D-lactic acid) Stereocomplexation by Adding Poly(DL-lactic acid) 


Vol. 52,  No. 2, pp. 132-136, Apr.  2015
10.12772/TSE.2015.52.132


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  Abstract

Ternary blends of poly(L-lactic acid)(PLLA)/poly(D-lactic acid)(PDLA)/poly(DL-lactic acid)(PDLLA), with the PLLA/PDLA blend ratio fixed at 50:50 (w/w), were prepared by the solution blending method, and their thermal properties were investigated by differential scanning calorimetry. Ternary blends containing less than 30% PDLLA exhibit double melting peaks at around 170oC (Tm1) and 220 oC (Tm2), where Tm1 and Tm2 are the melting peaks of the homopolymer (PLLA and PDLA) and stereocomplex crystals, respectively. On the other hand, blends containing more than 50% PDLLA exhibit only one melting peak at about 220 oC, which corresponds to the melting peak of the stereocomplex crystal. Further, the heat of fusion of the homopolymer crystals decreases with increasing PDLLA content in the blend, whereas that of the stereocomplex crystal increases with increasing PDLLA content. Therefore, it may be concluded that while the addition of PDLLA to the PLLA/PDLA (50:50) binary blend enhances the stereocomplexation of PLLA and PDLA, it also disturbs the crystallization of the homopolymers.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

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