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分别采用无机黏土(Clay)、十八烷基三甲基溴化铵(STAB)改性黏土(S-OC)以及十八烷基三甲基溴化铵(STAB)/十二烷基磺酸钠(SDS)复配改性黏土(SS-OC)填充聚乳酸(PLA)制得复合材料PLA/Clay、PLA/S-OC和PLA/SS-OC,通过拉伸性能测试和冲击性能测试,研究了黏土种类及含量对复合材料力学性能的影响。结果表明:PLA/SS-OC的力学性能(拉伸强度、断裂伸长率、冲击强度)均最优,随着SS-OC含量的增加,材料的力学性能先升高后下降,含量为2%时,性能最佳。通过X射线衍射(XRD)和扫描电子显微镜分析(SEM)发现,黏土改性后,晶层间距增大,在PLA基体中分散性提高,且SS-OC插层效果优于S-OC。
Clay, ST-C modified clay (S-OC) and stearyl trimethyl ammonium bromide (STAB) / dodecyl sulfonic acid The PLA / Clay, PLA / S-OC and PLA / SS-OC composites were prepared by filling sodium polyacrylate (SDS) composite modified clay (SS-OC) with polylactic acid (PLA). Tensile properties and impact properties were tested. The effects of clay types and contents on the mechanical properties of the composites were studied. The results showed that the mechanical properties (tensile strength, elongation at break and impact strength) of PLA / SS-OC were the best. With the increase of SS-OC content, the mechanical properties of PLA / SS- %, The best performance. X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that the intergranular spacing increased after clay modification, and the dispersion in the PLA matrix was improved. The intercalation effect of SS-OC was better than that of S-OC.