Abstract:Solid heat-expandable foam precursors were prepared by impregnating melt-blended poly(D,L-lactide) (PDLLA)-poly(methyl methacrylate) (PMMA) blends with liquid carbon dioxide (CO 2 ). The phase behavior of these blends was strongly dependent on the processing steps, but impregnation with liquid CO 2 led to phase separation regardless of the prior thermomechanical history, and crystallization in blends containing a low-D grade of PDLLA suppressed subsequent expansion. On the other hand, blends containing nominal… Show more
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