摘要
分别用苯乙烯和丙烯酸乙酯对纳米SiO2进行辐照接枝聚合改性,通过两步熔融共混工艺与聚丙烯(PP)共混制备了SiO2/PP复合材料。研究了SiO2添加量和表面接枝不同聚合物的SiO2对复合材料力学性能的影响。结果表明,接枝改性的SiO2对PP有较好的增强增韧效果;拉伸断面观察显示复合材料韧性的提高主要由基体剪切屈服所致。对断面上个别较大团聚体分析发现,经辐照接枝聚合改性的纳米粒子团聚体的结构变得更加紧凑、结实,且随粒子表面聚合物的性质不同,团聚体与基体树脂的界面粘结也随之不同,导致其拉伸破坏形状有所差异,但与基体树脂的界面粘结都得到较好的改善。
To modify the surface of nano-SiO2, polytyrene and polyethylacrylate were grafted onto the particles through irradiation grafting polymerization, respectively. The mechanical testing of the modified nanosilica filled polyspropylene (PP) composites reveals the significant strengthening and toughening effects of the treated nanoparticles on the matrix resin. It is believed that the extensive shear deformation of PP induced by the modified nanosilica is responsible for the toughness improvement of the composites. The microscopic observation further demonstrates that the modified nanoparticle aggregates become more compact due to the grafting polymer chains, which in turn provides an enhanced interfacial adhesion between the fillers and the matrix.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2002年第6期61-67,共7页
Acta Materiae Compositae Sinica
基金
教育部科学技术重点项目(99198)
广东省自然科学基金项目(990277)
广东省自然科学基金研究团队项目
广东省科技厅十五重大专项(A10172)
关键词
表面接枝
聚合改性
力学性能
聚丙烯
纳米SIO2
复合材料
辐照接枝
二氧化硅
Chemical modification
Composite micromechanics
Mechanical properties
Nanostructured materials
Polymerization
Polypropylenes
Silica
