Graphite nanosheets (GNPs) were used to improve the heat resistance and crystallization properties of polylactic acid (PLA).Meanwhile,the effects of polyethylene glycol (PEG) with different molecular weight (mol.wt.) on crystallization and thermal properties of PLA/GNPs composites were studied.A series of PLA-based composites were prepared by melt-blending using an extruder and tested via scanning electron microscopy (SEM),X-ray diffractometry (XRD),differential scanning calorimetry (DSC),polarized light microscopy (POM),and thermogravimetric analyzer (TG).The results shown that GNPs,as heterogeneous nucleation sites,reduced the nucleation barrier and can effectively induce crystallization without changing the crystal form of PLA.Compared to high molecular weight PEG,the effect of low molecular weight PEG on crystallization of the composites was more distinct.Compared with pure PLA,the T50% of PLA/GNPs increased by 2.2℃,Tf increased by 11℃,and the T50% and Tf of PLA/GNPs/PEG20000 increased by 12℃ and 13℃,respectively;The Xc of PLA/GNPs/PEG4000 was the largest,which was 28.46% higher than pure PLA.
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基金资助
国家自然科学基金项目(51703121);中国博士后科学基金特别资助项目(2018T111050)
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