Material appearance of equimolar PLLA50/PDLA50 blends by low temperature approach (at processing temperature lower than 200ºC) (a), conventional melt blending (atprocessing temperature of 220 °C) (b), and solution casting (c)
More interesting, the appearance of PLLA50/PDLA50 blends
prepared by this low temperature approach can be powder form.
Fig. 2 shows the material appearance of PLLA50/PDLA50 blends by
the low temperature approach (at processing temperature lower
than 200 C) (a), compared with conventional melt blending (at
processing temperature of 220 C) (b) and solution casting (c). The
final shape of PLLA50/PDLA50 blends prepared by conventional melt
blending and solution casting method are hard pieces that are very
difficult to make into a powder form for further applications.
However, the low temperature approach shows great difference. At
the processing temperatures lower than 200 C, the fine powder
form of stereocomplex in the scale of micron meters can be ob-
tained directly. Also, when a separate PLLA or PDLA is processed at
similar low temperatures, powder form cannot be obtained.
Material appearance of equimolar PLLA50/PDLA50 blends by low temperature approach (at processing temperature lower than 200ºC) (a), conventional melt blending (atprocessing temperature of 220 °C) (b), and solution casting (c)More interesting, the appearance of PLLA50/PDLA50 blendsprepared by this low temperature approach can be powder form.Fig. 2 shows the material appearance of PLLA50/PDLA50 blends bythe low temperature approach (at processing temperature lowerthan 200 C) (a), compared with conventional melt blending (atprocessing temperature of 220 C) (b) and solution casting (c). Thefinal shape of PLLA50/PDLA50 blends prepared by conventional meltblending and solution casting method are hard pieces that are verydifficult to make into a powder form for further applications.However, the low temperature approach shows great difference. Atthe processing temperatures lower than 200 C, the fine powderform of stereocomplex in the scale of micron meters can be ob-tained directly. Also, when a separate PLLA or PDLA is processed atsimilar low temperatures, powder form cannot be obtained.
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