PA6/蛭石复合材料的制备与性能

Preparation and Properties of PA6/Vermiculite Composites

以蛭石微粉、尼龙6为主要原料,十六烷基三甲基溴化铵为改性剂,采用阳离子交换法和插层法制备PA6/蛭石复合材料,分析蛭石在基体中的分散程度及其对复合材料力学性能的影响。结果表明:未加入改性剂的复合材料中,蛭石分散度较差且与基体的界面相容性不佳,材料表面明显可见团聚状态蛭石颗粒;加入改性剂的复合材料中,蛭石在基体中分散均匀、粒径较小,复合材料表面较平整,团聚态蛭石颗粒显著减少。未改性情况下,材料模量提升明显,最大可提高63.3%,但断裂应力与断裂伸长率在蛭石质量分数大于10%后有所下降;改性后,复合材料模量提升更明显,最大可提高154.5%,断裂应力与断裂伸长率也有显著提升。

PA6/vermiculite composites were prepared by cation exchange method and intercalation method with vermiculite powder and nylon 6 as main raw materials and cetyltrimethylammonium bromide as modifier.The dispersion degree of vermiculite in the matrix and its influence on the mechanical properties of composites were analyzed.The results show that in the composites without modifiers,the dispersion of vermiculite is poor,and the interface compatibility with the matrix is poor,and the agglomerated vermiculite particles are obviously visible on the surface of the materials.In the composite added with modifiers,the vermiculite is uniformly dispersed in the matrix with small particle size,the composite surface is relatively flat,and the agglomerated vermiculite particles are significantly reduced.Without modification,the modulus of the composites increases significantly,with a maximum increase of 633%,but the breaking stress and elongation at break decrease after the mass fraction of vermiculite is more than 10%.After modification,the modulus of the composite is improved more significantly,with a maximum increase of 154.5%,and the breaking stress and elongation at break are also improved significantly.