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采用聚乙二醇(PEG)通过溶液插层对钠基蒙脱土(Na-MMT)进行有机化改性,并利用左旋乳酸(L-LA)和异佛尔酮二异氰酸酯(IPDI)对所得有机蒙脱土(OMMT)的表面进行接枝改性,得到聚乳酸(PLA)接枝有机蒙脱土PLA-g-OMMT;然后通过溶液共混的方式制备出PLA/PLA-g-OMMT纳米复合材料。结果表明:通过溶液插层和表面接枝对Na-MMT进行修饰,然后将其与PLA复合,可以同时提高PLA材料的强度和韧性。其中当PLA-g-OMMT用量为PLA的2%时,其改性效果最好,复合材料的拉伸强度和断裂伸长率分别达到41.84 MPa和8.01%。另外,PLA-g-OMMT的引入能够改善复合材料的结晶性能,并可使材料的玻璃化转变温度降低。
Sodium montmorillonite (Na-MMT) was organically modified by PEG (polyethylene glycol) through solution intercalation, and the resulting product was characterized by L-lactic acid and isophorone diisocyanate (IPDI) The surface of OMMT was grafted and modified to obtain PLA-g-OMMT with PLA-grafted organic montmorillonite. PLA / PLA-g-OMMT nanocomposites were prepared by solution blending Composites. The results show that the Na-MMT modified by solution intercalation and surface grafting, and then combined with PLA, can simultaneously improve the strength and toughness of PLA materials. When PLA-g-OMMT was 2% PLA, the modification effect was the best. The tensile strength and elongation at break of the composites reached 41.84 MPa and 8.01% respectively. In addition, the introduction of PLA-g-OMMT can improve the crystalline properties of the composites and reduce the glass transition temperature of the materials.