聚酰胺6/环氧树脂改性蒙脱土纳米复合材料的制备与性能

采用环氧树脂改性蒙脱土（MMT）得到有机化蒙脱土（OMMT），再用熔融插层法制备了聚酰胺6 （PA6）/ OMMT纳米复合材料。采用X射线衍射仪、透射电子显微镜、万能材料试验机、热重分析仪等研究了PA6/OMMT复合材料的形态结构、力学性能和热稳定性。结果表明，经环氧树脂改性得到的OMMT的层间距明显增加，从未改性的1.22 nm增加到5.13 nm，并以纳米尺度分散于PA6基体中；随着OMMT含量的增加，PA6/ OMMT复合材料的强度和模量增加，热变形温度提高，其拉伸强度可达76 MPa，弯曲模量达到3.462 GPa，热变形温度为134 ℃；PA6/ OMMT复合材料失重10 %时的温度为422 ℃，比纯PA6的406 ℃提高了16 ℃，改善了PA6的热稳定性。

Preparation and Properties of PA6/Epoxy Resin Modified Montmorillonite Nanocomposites

Montmorillonite (MMT) was modified by epoxy resin leading to organic montmorillonite (OMMT), whose interlayer spacing increased from 1.22 nm to 5.13 nm. The OMMT was dispersed into PA6 as nano-scale particles forming nanocomposites. X-ray diffraction (XRD), transmission electron microscopy (TEM), universal testing machine, and thermogravimetric analysis (TGA) were used to investigate the morphology, mechanical properties, and thermal stability of PA6/OMMT nanocomposites. With increasing OMMT content, the strength, modulus, and heat distortion temperature of the PA6/OMMT nanocomposites increased. A tensile strength of 76 MPa，a bending modulus of 3.462 GPa， and a heat distortion temperature of 134 ℃ were obtained. The thermal stability of PA6 was also improved by OMMT, the temperature of 10 % weight loss reached 422 ℃, 16 ℃ higher than that of neat PA6.