原位聚合制备SiO2高含量PA6／SiO2母料及其复合材料

In-situ Preparation of PA6/SiO_2 Masterbatch and Its Composites

采用溶剂转移法对二氧化硅(SiO_2)进行改性处理,并通过原位聚合方法制备了 SiO_2高含量的聚酰胺6(PA6)/SiO_2母料,将母料与纯 PA6共混制备了 PA6/SiO_2纳米复合材料。通过 X 射线衍射、透射电镜等分别对PA6/SiO_2纳米复合材料的结晶及晶型结构、微观分散形态进行了表征;并对力学性能等进行了测试。结果表明,改性后的 SiO_2在 PA6原位聚合体系中分散均匀且能够达到纳米级的分散效果,起到异相成核剂的作用。PA6/SiO_2纳米复合材料与传统熔融法相比拉伸强度提高了12.17%,断裂伸长率提高了37.30%,缺口冲击强度提高了37.25%。

Nano silica was surface modified through solvent transfer method. In presence of the modified silica, ε-caprolactam was in situ polymerized leading to a masterbatch, which was subsequently blended with neat polyamide 6 resulting in nano-composites. TEM showed that a uniform dispersion of SiO2 in the matrix was achieved, which may react as nucleating agent. The tensile stress and elongation at break of the nanocomposites were improved by 12.17% and 37.30% compared with those prepared by melting methods. The Izod impact was increased by 37.25%.