《Table 3 Mechanical properties of PLA/PPC/DCP blends with different DCP contents》

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《Fully Biodegradable Poly(lactic acid)/Poly(propylene carbonate) Shape Memory Materials with Low Recovery Temperature Based on in situ Compatibilization by Dicumyl Peroxide》

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Figure 6 illustrates the stress-strain relationship for the PLA/PPC/DCP blends and Table 3 gives the detailed data.From Fig.6，it is seen that all the samples（with and without DCP）exhibited typical ductile tensile behavior with a yield strength above 45 MPa.When the DCP content was 1 wt%or lower，the elongation at break increased from 40%（PLA/PPC70/30）to 107%（PLA/PPC/DCP 70/30/1），an increase of about 2 times compared with their original binary blends.However，the elongation at break dropped quickly when the content of DCP was above 1 wt%.Combining the gel fraction in Fig.5（f）and the morphology shown in SEM images in Fig.5，the increase of elongation can be attributed to the increase of compatibility of PLA and PPC.The decrease of elongation at break might be caused by excessive cross-linking，leading to a decrease in chain mobility.In general，the cross-linking would enhance the strength.Therefore，the almost unchanged tensile strength for blend with and without DCP was very unusual.It reminds us again that the degradation reaction，accompanying the cross-linking reaction in PLA/PPC/DCP samples，might contribute to the decreased strength when DCP content was higher than 1 wt%.