Abstract: The Si0 hollow nanospheres was modified with silane coupling agent(A-172), which effectively enhanceed the hydrophobic ability and avoided agglomeration due to the enrichment of C=C bonds on its surface when modified with A-172. The modified SiO₂ A-172 hollow nanospheres were then introduced into the pure acrylic emulsion system to study their influence on the properties of the emulsion. The as-obtained samples were further characterized by high resolution transmission electron microscopy(HRTEM), scanning electron microscope(SEM), fourier transform-infrared spectroscopy(FT-IR), thermal grmetric analysis(TGA) and adhesion test to investigate their structure and morphology. The result indicated that the modified SiO₂ hollow nanospheres exhibited high dispersion stability in organic solutions after modification with A-172. Moreover, the thermal stability and adhesion of pure acrylic emulsion were improved significantly by the introduction of A-172 modified SiO₂ hollow nanospheres.

Key words: SiO₂ hollow nanospheres, pure acrylic emulsion, modification

摘要： 采用硅烷偶联剂 A-172 改性空心 SiO₂ 纳米球，使其表面带有富含碳碳双键的活性基团，有效地增强了空心 SiO₂ 纳米球的疏水性，明显减少了团聚现象。 进一步将其引入到纯丙乳液中，研究了其对纯丙乳液性能的影响。 使用扫描电镜（ SEM） 、高倍透射电镜（ HRTEM）观察了改性前后空心 SiO₂ 纳米球的形貌；使用傅里叶红外（ FT - IR） 、热重分析（ TG） 、附着力测试等对改性纯丙乳液的结构及性能进行了表征。 结果表明：硅烷偶联剂改性后的空心 SiO₂ 纳米球在有机溶剂中的分散性明显强，且并未破坏其形貌结构；空心 SiO₂ 纳米球改性后的纯丙乳液热稳定性及附着力明显提高。

关键词: 空心 SiO₂ 纳米球, 纯丙乳液, 改性