两次挤出制备尼龙66/纳米SiO_2复合材料及其结构与性能

Structure and Mechanical Properties of PA66/Nano-SiO_2 Composites Prepared by Twi-Extrusion

通过双螺杆两次挤出技术制得了尼龙66/SiO2纳米微粒复合材料,发现二次挤出的复合材料的拉伸强度、断裂伸长率、杨氏模量、简支梁缺口冲击强度较纯尼龙66均有很大程度的提高,并通过动态力学热分析研究了复合材料的动态力学性能,复合材料的储能模量及玻璃化转变温度均有不同程度的提高。借助SEM分析了复合材料的拉伸断面形貌,并用DSC研究了复合材料的结晶行为。

The PA66/nano- SiO2composite was prepared by using a twin-screw extruder with extrusion twice and its mechanical and dynamic mechanical properties were investigated. The structural aspects were also studied by SEM and DSC. The results show that the tensile strength, elongation at break, modulus in tension, and the notch impact strength of nanocomposite are all higher than those of neat PA 66. The tensile fracture morphologies of nanocomposites reveal a coarser fracture pattern. The crystallization rate of nanocomposites is increased and the nano-SiO2works as a nucleating agent and decreases the crystallinity of nanocomposites.