Abstract: The surface of layered double hydroxides (LDHs) was treated with titanates coupling agent NDZ-201，silane coupling agent KH-570，stearic acid and stearic acid-rare earth coupling agent and the samples were characterized by XRD，FT-IR. The effect of the kinds and contents of coupling agent on the mechanical and rheological properties of linear low density polyethylene（LLDPE）composites filled with modified LDHs was investigated. The results showed that the functional groups of LDHs changed and the layered structure of LDHs remained after modified with each coupling agent. After the LDH was modified，the elongation at break and rheological properties of LLDPE/LDHs composite materials were improved. For the LDHs treated with 4% stearic acid，the elongation at break of LLDPE/LDHs composite material was 160%，and the equilibrium torque of LLDPE/LDHs composite materials was 8 N·m.

摘要： 采用钛酸酯偶联剂NDZ-201、硅烷偶联剂KH-570、硬脂酸和硬脂酸-稀土偶联剂，对水滑石（LDHs）进行表面改性处理，通过X射线衍射和红外光谱表征了改性前后LDHs的结构变化；并研究了不同种类偶联剂及其含量对LDHs填充LLDPE复合体系的力学性能和流变性能的影响。结果表明：4种偶联剂均可以实现LDHs表面改性，并且不会改变LDHs层状结构；改性后LLDPE/LDHs复合材料的断裂伸长率和流变性能得到提高；其中用4%硬脂酸改性LDHs时，LLDPE/LDHs复合材料的断裂伸长率为160%，平衡扭矩为8 N·m。