Study on enhanced interfacial compatibility and foaming properties of PLA/NR blends based on an in situ crosslinking compatibilization strategy
Polylactic acid(PLA)is currently one of the most promising biomaterials,but its poor toughness greatly limits its development and application in the plastics field.It has been found that the addition of natural rubber(NR)can improve the disadvantage of its poor toughness,but they are incompatible systems and poor foaming performance.Therefore,in this paper,1,4-bis(tert-butylperoxyisopropyl)benzene(BIPB)was used to enhance the inter-facial compatibility of PLA and NR based on the principle of in situ cross-linking and capacity enhancement,and PLA/NR composite foams were prepared by supercritical carbon dioxide(scCO2)foaming technology.The effects of different BIPB contents on the interfacial com-patibility,toughness and foaming behavior of the composites were investigated.The results showed that the addition of BIPB significantly enhanced the compatibility,toughness and foa-ming behavior of PLA/NR composites.When the BIPB content was 0.25 phr,the elongation at break of PLA/NR composites increased from 25.75％to 35.24％,which was a 1.37 times enhancement;the apparent density decreased from the initial 0.565 g·cm-3 to 0.373 g·cm-3,and the average cell size decreased from 7.5 μm to 5.0 μm.
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