摘要
通过化学方法成功地实现了矿物粉体在Ca(OH)2 H2O CO2体系中的表面纳米化修饰,即在微米级重质碳酸钙、硅灰石粉体表面形核生成粒径均匀的纳米碳酸钙颗粒层。研究表明,表面纳米化修饰后的矿物粉体表面的粗糙度大大增加,尖锐的棱角得以钝化,纳米化修饰后矿物粉体比表面积比原来提高至少200%以上。将经表面纳米化修饰后的硅灰石粉体在聚丙烯(PP)中填充应用,较未经表面纳米化修饰的硅灰石粉体填料,其抗冲击强度提高65%以上,延伸率提高200%以上。
The mineral composite particles with rough surfaces and blunt edge angles, coated by nanometer calcium carbonate with a particle size range of 20-100 nm, were successfully prepared by a chemical method in Ca(OH)2-H2O-CO2 system. The specific surface area of the composite powders increased twice or above after coating. It is exhibited that polypropylene (PP) composites filled by the composite powders with nano-structure surface have better properties because the nano-structured mineral powders have bigger surface areas which would lead to more interfacial compatibility between powders and polymer matrix when the powders are filled into the polymer and moreover, the blunt edge angles would reduce the stress concentration at angles, compared with un-coated powders as filler.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第1期68-73,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金项目(50474003)
关键词
矿物粉体
表面纳米化修饰
表面改性
应用
Applications
Calcium compounds
Impact testing
Minerals
Nanostructured materials
Polypropylenes
Surface roughness
Surface treatment
Tensile strength
