聚酰胺6/纳米二氧化硅复合材料的制备和界面研究

Preparation and Interface Characterization of PA6/Nano-SiO_2 Composites

采用原位聚合法制备了聚酰胺6/纳米二氧化硅(PA6/nano-SiO_2)复合材料,用力学性能测试、扫描电镜和差示扫描量热法对纳米 SiO_2粒子和 PA6的界面黏结性进行了表征和研究。结果表明:利用经验公式和力学性能数据计算得知 PA6/改性 SiO_2纳米复合材料的界面参数 B 值都比 PA6/未改性 SiO_2纳米复合材料的大;扫描电镜观察表明在 PA6中加入纳米 SiO_2,材料的微观结构发生了变化,改性 SiO_2与 PA6之间形成了较好的界面结合;分散于 PA6中的纳米 SiO_2粒子起到了异相成核作用,改性后的 SiO_2和 PA6之间形成柔性界面层有利于 PA6的结晶。

PA6/nano SiO2 composites were prepared by in-situ polymerization. The interracial compatibility between nano-SiO2 and PA6 matrix was characterized by mechanical experiment, SEM, and DSC. It showed that the interracial parameters B for PA6/modified SiO2 was larger than that for PA6/unmodified SiO2. SEM observation showed that the introduction of SiO2 changed the microstructure of the materials. Better interracial binding was observed between PA6 matrix and modified SiO2, which resulted in a flexible interface layer favorable to the crystallization of PA6.