SiO_2纳米粒子增强改性聚乙烯力学性能的研究

Study on Mechanical Properties of Polyethylene Modified with Nano-SiO_2

以不同比例的SiO2纳米粒子与mLLDPE/LDPE基材进行熔融共混所获得的复合材料为研究对象,力学性能测试和SEM、TEM观察照片研究结果表明:当使用经处理的2%SiO2纳米粒子时,其复合材料力学性能达到最佳值;与纯mLLDPE/LDPE相比,拉伸强度、断裂伸长率分别提升了13.7MPa和174.9%,表明了SiO2无机纳米粒子被分散于基材中,与基材形成牢固的界面结合,与基体树脂之间的链段发生缠结,形成了有利于力学性能提高的界面结构.

Composite material obtained from melt-blending nano-SiO_2 with mLLDPE/LDPE in different proportions is taken as the objective of this research. When the proportion of nano-SiO_2 is 2%, the mechanical properties of the composite material are the best. Meanwhile, compared with pure mLLDPE / LDPE, the tensile strength and breaking elongation percentage are increased by (13.7MPa) and 174.9% respectively. These results show that nano-SiO_2 is dispersed in mLLDPE / LDPE that firm boundaries are formed. Nano-SiO_2 is tangled in segments between resins to form a boundary structure advantageous to improve mechanical properties.